FileUtils.java

package org.codehaus.plexus.util;

/* ====================================================================
 * The Apache Software License, Version 1.1
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 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
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 *    notice, this list of conditions and the following disclaimer.
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 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.codehaus.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.net.URL;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.security.SecureRandom;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Random;

import org.codehaus.plexus.util.io.InputStreamFacade;
import org.codehaus.plexus.util.io.URLInputStreamFacade;

/**
 * <p>This class provides basic facilities for manipulating files and file paths.</p>
 *
 * <b>Path-related methods</b>
 *
 * <p>Methods exist to retrieve the components of a typical file path. For example
 * <code>/www/hosted/mysite/index.html</code>, can be broken into:
 * <ul>
 * <li><code>/www/hosted/mysite/</code> -- retrievable through {@link #getPath}</li>
 * <li><code>index.html</code> -- retrievable through {@link #removePath}</li>
 * <li><code>/www/hosted/mysite/index</code> -- retrievable through {@link #removeExtension}</li>
 * <li><code>html</code> -- retrievable through {@link #getExtension}</li>
 * </ul>
 * <p>There are also methods to {@link #catPath concatenate two paths}, {@link #resolveFile resolve a path relative to a
 * File} and {@link #normalize} a path.</p>
 *
 * <b>File-related methods</b>
 *
 * <p>There are methods to create a {@link #toFile File from a URL}, copy a {@link #copyFileToDirectory File to a
 * directory}, copy a {@link #copyFile File to another File}, copy a {@link #copyURLToFile URL's contents to a File}, as
 * well as methods to {@link #deleteDirectory(File) delete} and {@link #cleanDirectory(File) clean} a directory.</p>
 *
 * <p>Common {@link java.io.File} manipulation routines.</p>
 *
 * <p>Taken from the commons-utils repo. Also code from Alexandria's FileUtils. And from Avalon Excalibur's IO. And from
 * Ant.</p>
 *
 * @author <a href="mailto:burton@relativity.yi.org">Kevin A. Burton</A>
 * @author <a href="mailto:sanders@codehaus.org">Scott Sanders</a>
 * @author <a href="mailto:dlr@finemaltcoding.com">Daniel Rall</a>
 * @author <a href="mailto:Christoph.Reck@dlr.de">Christoph.Reck</a>
 * @author <a href="mailto:peter@codehaus.org">Peter Donald</a>
 * @author <a href="mailto:jefft@codehaus.org">Jeff Turner</a>
 *
 */
public class FileUtils extends BaseFileUtils {
    /**
     * The number of bytes in a kilobyte.
     */
    public static final int ONE_KB = 1024;

    /**
     * The number of bytes in a megabyte.
     */
    public static final int ONE_MB = ONE_KB * ONE_KB;

    /**
     * The number of bytes in a gigabyte.
     */
    public static final int ONE_GB = ONE_KB * ONE_MB;

    /**
     * The vm file separator
     */
    public static String FS = File.separator;

    /**
     * Non-valid Characters for naming files, folders under Windows: <code>":", "*", "?", "\"", "<", ">", "|"</code>
     *
     * @see <a href="http://support.microsoft.com/?scid=kb%3Ben-us%3B177506&x=12&y=13">
     *      http://support.microsoft.com/?scid=kb%3Ben-us%3B177506&x=12&y=13</a>
     */
    private static final String[] INVALID_CHARACTERS_FOR_WINDOWS_FILE_NAME = {":", "*", "?", "\"", "<", ">", "|"};

    /**
     * @return the default excludes pattern
     * @see DirectoryScanner#DEFAULTEXCLUDES
     */
    public static String[] getDefaultExcludes() {
        return DirectoryScanner.DEFAULTEXCLUDES;
    }

    /**
     * @return the default excludes pattern as list.
     * @see #getDefaultExcludes()
     */
    public static List<String> getDefaultExcludesAsList() {
        return Arrays.asList(getDefaultExcludes());
    }

    /**
     * @return the default excludes pattern as comma separated string.
     * @see DirectoryScanner#DEFAULTEXCLUDES
     * @see StringUtils#join(Object[], String)
     */
    public static String getDefaultExcludesAsString() {
        return StringUtils.join(DirectoryScanner.DEFAULTEXCLUDES, ",");
    }

    /**
     * Returns a human-readable version of the file size (original is in bytes).
     *
     * @param size The number of bytes.
     * @return A human-readable display value (includes units).
     */
    public static String byteCountToDisplaySize(int size) {
        String displaySize;

        if (size / ONE_GB > 0) {
            displaySize = String.valueOf(size / ONE_GB) + " GB";
        } else if (size / ONE_MB > 0) {
            displaySize = String.valueOf(size / ONE_MB) + " MB";
        } else if (size / ONE_KB > 0) {
            displaySize = String.valueOf(size / ONE_KB) + " KB";
        } else {
            displaySize = String.valueOf(size) + " bytes";
        }

        return displaySize;
    }

    /**
     * Returns the directory path portion of a file specification string. Matches the equally named unix command.
     *
     * @param filename the file path
     * @return The directory portion excluding the ending file separator.
     */
    public static String dirname(String filename) {
        int i = filename.lastIndexOf(File.separator);
        return (i >= 0 ? filename.substring(0, i) : "");
    }

    /**
     * Returns the filename portion of a file specification string.
     *
     * @param filename the file path
     * @return The filename string with extension.
     */
    public static String filename(String filename) {
        int i = filename.lastIndexOf(File.separator);
        return (i >= 0 ? filename.substring(i + 1) : filename);
    }

    /**
     * Returns the filename portion of a file specification string. Matches the equally named unix command.
     *
     * @param filename the file path
     * @return The filename string without extension.
     */
    public static String basename(String filename) {
        return basename(filename, extension(filename));
    }

    /**
     * Returns the filename portion of a file specification string. Matches the equally named unix command.
     *
     * @param filename the file path
     * @param suffix the file suffix
     * @return the basename of the file
     */
    public static String basename(String filename, String suffix) {
        int i = filename.lastIndexOf(File.separator) + 1;
        int lastDot = ((suffix != null) && (suffix.length() > 0)) ? filename.lastIndexOf(suffix) : -1;

        if (lastDot >= 0) {
            return filename.substring(i, lastDot);
        } else if (i > 0) {
            return filename.substring(i);
        } else {
            return filename; // else returns all (no path and no extension)
        }
    }

    /**
     * Returns the extension portion of a file specification string. This everything after the last dot '.' in the
     * filename (NOT including the dot).
     *
     * @param filename the file path
     * @return the extension of the file
     */
    public static String extension(String filename) {
        // Ensure the last dot is after the last file separator
        int lastSep = filename.lastIndexOf(File.separatorChar);
        int lastDot;
        if (lastSep < 0) {
            lastDot = filename.lastIndexOf('.');
        } else {
            lastDot = filename.substring(lastSep + 1).lastIndexOf('.');
            if (lastDot >= 0) {
                lastDot += lastSep + 1;
            }
        }

        if (lastDot >= 0 && lastDot > lastSep) {
            return filename.substring(lastDot + 1);
        }

        return "";
    }

    /**
     * Check if a file exits.
     *
     * @param fileName the file path.
     * @return true if file exists.
     */
    public static boolean fileExists(String fileName) {
        File file = new File(fileName);
        return file.exists();
    }

    /**
     * Note: the file content is read with platform encoding.
     *
     * @param file the file path
     * @return the file content using the platform encoding.
     * @throws IOException if any
     */
    public static String fileRead(String file) throws IOException {
        return fileRead(file, null);
    }

    /**
     * @param file the file path
     * @param encoding the wanted encoding
     * @return the file content using the specified encoding.
     * @throws IOException if any
     */
    public static String fileRead(String file, String encoding) throws IOException {
        return fileRead(Paths.get(file), encoding);
    }

    /**
     * Note: the file content is read with platform encoding
     *
     * @param file the file path
     * @return the file content using the platform encoding.
     * @throws IOException if any
     */
    public static String fileRead(File file) throws IOException {
        return fileRead(file, null);
    }

    /**
     * @param file the file path
     * @param encoding the wanted encoding
     * @return the file content using the specified encoding.
     * @throws IOException if any
     */
    public static String fileRead(File file, String encoding) throws IOException {
        return fileRead(file.toPath(), encoding);
    }

    /**
     * Appends data to a file. The file will be created if it does not exist. Note: the data is written with platform
     * encoding
     *
     * @param fileName The path of the file to write.
     * @param data The content to write to the file.
     * @throws IOException if any
     * @deprecated use {@code java.nio.files.Files.write(filename, data.getBytes(encoding),
     *     StandardOpenOption.APPEND, StandardOpenOption.CREATE)}
     */
    public static void fileAppend(String fileName, String data) throws IOException {
        fileAppend(fileName, null, data);
    }

    /**
     * Appends data to a file. The file will be created if it does not exist.
     *
     * @param fileName The path of the file to write.
     * @param encoding The encoding of the file.
     * @param data The content to write to the file.
     * @throws IOException if any
     * @deprecated use {@code java.nio.files.Files.write(filename, data.getBytes(encoding),
     *     StandardOpenOption.APPEND, StandardOpenOption.CREATE)}
     */
    public static void fileAppend(String fileName, String encoding, String data) throws IOException {
        fileAppend(Paths.get(fileName), encoding, data);
    }

    private static void fileAppend(Path path, String encoding, String data) throws IOException {
        fileWrite(path, encoding, data, StandardOpenOption.APPEND, StandardOpenOption.CREATE);
    }

    /**
     * Writes data to a file. The file will be created if it does not exist. Note: the data is written with platform
     * encoding
     *
     * @param fileName The path of the file to write.
     * @param data The content to write to the file.
     * @throws IOException if any
     */
    public static void fileWrite(String fileName, String data) throws IOException {
        fileWrite(fileName, null, data);
    }

    /**
     * Writes data to a file. The file will be created if it does not exist.
     *
     * @param fileName The path of the file to write.
     * @param encoding The encoding of the file.
     * @param data The content to write to the file.
     * @throws IOException if any
     */
    public static void fileWrite(String fileName, String encoding, String data) throws IOException {
        Path file = (fileName == null) ? null : Paths.get(fileName);
        fileWrite(file, encoding, data);
    }

    /**
     * Writes data to a file. The file will be created if it does not exist. Note: the data is written with platform
     * encoding
     *
     * @param file The file to write.
     * @param data The content to write to the file.
     * @throws IOException if any
     * @since 2.0.6
     */
    public static void fileWrite(File file, String data) throws IOException {
        fileWrite(file, null, data);
    }

    /**
     * Writes data to a file. The file will be created if it does not exist.
     *
     * @param file The file to write.
     * @param encoding The encoding of the file.
     * @param data The content to write to the file.
     * @throws IOException if any
     * @since 2.0.6
     */
    public static void fileWrite(File file, String encoding, String data) throws IOException {
        fileWrite(file.toPath(), encoding, data);
    }

    /**
     * Deletes a file.
     *
     * @param fileName The path of the file to delete.
     */
    public static void fileDelete(String fileName) {
        File file = new File(fileName);
        try {
            NioFiles.deleteIfExists(file);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Waits for NFS to propagate a file creation, imposing a timeout.
     *
     * @param fileName The path of the file.
     * @param seconds The maximum time in seconds to wait.
     * @return True if file exists.
     */
    public static boolean waitFor(String fileName, int seconds) {
        return waitFor(new File(fileName), seconds);
    }

    /**
     * Waits for NFS to propagate a file creation, imposing a timeout.
     *
     * @param file The file.
     * @param seconds The maximum time in seconds to wait.
     * @return True if file exists.
     */
    public static boolean waitFor(File file, int seconds) {
        int timeout = 0;
        int tick = 0;
        while (!file.exists()) {
            if (tick++ >= 10) {
                tick = 0;
                if (timeout++ > seconds) {
                    return false;
                }
            }
            try {
                Thread.sleep(100);
            } catch (InterruptedException ignore) {
                // nop
            }
        }
        return true;
    }

    /**
     * Creates a file handle.
     *
     * @param fileName The path of the file.
     * @return A <code>File</code> manager.
     */
    public static File getFile(String fileName) {
        return new File(fileName);
    }

    /**
     * <p>Given a directory and an array of extensions return an array of compliant files.</p>
     *
     * <p>TODO Should an ignore list be passed in? TODO Should a recurse flag be passed in?</p>
     *
     * <p>The given extensions should be like "java" and not like ".java"</p>
     *
     * @param directory The path of the directory.
     * @param extensions an array of expected extensions.
     * @return An array of files for the wanted extensions.
     */
    public static String[] getFilesFromExtension(String directory, String[] extensions) {
        List<String> files = new ArrayList<String>();

        File currentDir = new File(directory);

        String[] unknownFiles = currentDir.list();

        if (unknownFiles == null) {
            return new String[0];
        }

        for (String unknownFile : unknownFiles) {
            String currentFileName = directory + System.getProperty("file.separator") + unknownFile;
            File currentFile = new File(currentFileName);

            if (currentFile.isDirectory()) {
                // ignore all CVS directories...
                if (currentFile.getName().equals("CVS")) {
                    continue;
                }

                // ok... transverse into this directory and get all the files... then combine
                // them with the current list.

                String[] fetchFiles = getFilesFromExtension(currentFileName, extensions);
                files = blendFilesToVector(files, fetchFiles);
            } else {
                // ok... add the file

                String add = currentFile.getAbsolutePath();
                if (isValidFile(add, extensions)) {
                    files.add(add);
                }
            }
        }

        // ok... move the Vector into the files list...
        return files.toArray(new String[0]);
    }

    /**
     * Private helper method for getFilesFromExtension()
     */
    private static List<String> blendFilesToVector(List<String> v, String[] files) {
        for (String file : files) {
            v.add(file);
        }

        return v;
    }

    /**
     * Checks to see if a file is of a particular type(s). Note that if the file does not have an extension, an empty
     * string (&quot;&quot;) is matched for.
     */
    private static boolean isValidFile(String file, String[] extensions) {
        String extension = extension(file);
        if (extension == null) {
            extension = "";
        }

        // ok.. now that we have the "extension" go through the current know
        // excepted extensions and determine if this one is OK.

        for (String extension1 : extensions) {
            if (extension1.equals(extension)) {
                return true;
            }
        }

        return false;
    }

    /**
     * Simple way to make a directory
     *
     * @param dir the directory to create
     * @throws IllegalArgumentException if the dir contains illegal Windows characters under Windows OS.
     * @see #INVALID_CHARACTERS_FOR_WINDOWS_FILE_NAME
     */
    public static void mkdir(String dir) {
        File file = new File(dir);

        if (Os.isFamily(Os.FAMILY_WINDOWS) && !isValidWindowsFileName(file)) {
            throw new IllegalArgumentException("The file (" + dir
                    + ") cannot contain any of the following characters: \n"
                    + StringUtils.join(INVALID_CHARACTERS_FOR_WINDOWS_FILE_NAME, " "));
        }

        if (!file.exists()) {
            file.mkdirs();
        }
    }

    /**
     * Compare the contents of two files to determine if they are equal or not.
     *
     * @param file1 the first file
     * @param file2 the second file
     * @return true if the content of the files are equal or they both don't exist, false otherwise
     * @throws IOException if any
     */
    public static boolean contentEquals(final File file1, final File file2) throws IOException {
        final boolean file1Exists = file1.exists();
        if (file1Exists != file2.exists()) {
            return false;
        }

        if (!file1Exists) {
            // two not existing files are equal
            return true;
        }

        if (file1.isDirectory() || file2.isDirectory()) {
            // don't want to compare directory contents
            return false;
        }

        try (InputStream input1 = Files.newInputStream(file1.toPath());
                InputStream input2 = Files.newInputStream(file2.toPath())) {
            return IOUtil.contentEquals(input1, input2);
        }
    }

    /**
     * Convert from a <code>URL</code> to a <code>File</code>.
     *
     * @param url File URL.
     * @return The equivalent <code>File</code> object, or <code>null</code> if the URL's protocol is not
     *         <code>file</code>
     */
    public static File toFile(final URL url) {
        if (url == null || !url.getProtocol().equalsIgnoreCase("file")) {
            return null;
        }

        String filename = url.getFile().replace('/', File.separatorChar);
        int pos = -1;
        while ((pos = filename.indexOf('%', pos + 1)) >= 0) {
            if (pos + 2 < filename.length()) {
                String hexStr = filename.substring(pos + 1, pos + 3);
                char ch = (char) Integer.parseInt(hexStr, 16);
                filename = filename.substring(0, pos) + ch + filename.substring(pos + 3);
            }
        }
        return new File(filename);
    }

    /**
     * Convert the array of Files into a list of URLs.
     *
     * @param files the array of files
     * @return the array of URLs
     * @throws IOException if an error occurs
     */
    public static URL[] toURLs(final File[] files) throws IOException {
        final URL[] urls = new URL[files.length];

        for (int i = 0; i < urls.length; i++) {
            urls[i] = files[i].toURI().toURL();
        }

        return urls;
    }

    /**
     * Remove extension from filename. ie
     *
     * <pre>
     * foo.txt    --&gt; foo
     * a\b\c.jpg  --&gt; a\b\c
     * a\b\c      --&gt; a\b\c
     * </pre>
     *
     * @param filename the path of the file
     * @return the filename minus extension
     */
    public static String removeExtension(final String filename) {
        String ext = extension(filename);

        if ("".equals(ext)) {
            return filename;
        }

        final int index = filename.lastIndexOf(ext) - 1;
        return filename.substring(0, index);
    }

    /**
     * Get extension from filename. ie
     *
     * <pre>
     * foo.txt    --&gt; "txt"
     * a\b\c.jpg  --&gt; "jpg"
     * a\b\c      --&gt; ""
     * </pre>
     *
     * @param filename the path of the file
     * @return the extension of filename or "" if none
     */
    public static String getExtension(final String filename) {
        return extension(filename);
    }

    /**
     * Remove path from filename. Equivalent to the unix command <code>basename</code> ie.
     *
     * <pre>
     * a/b/c.txt --&gt; c.txt
     * a.txt     --&gt; a.txt
     * </pre>
     *
     * @param filepath the path of the file
     * @return the filename minus path
     */
    public static String removePath(final String filepath) {
        return removePath(filepath, File.separatorChar);
    }

    /**
     * Remove path from filename. ie.
     *
     * <pre>
     * a/b/c.txt --&gt; c.txt
     * a.txt     --&gt; a.txt
     * </pre>
     *
     * @param filepath the path of the file
     * @param fileSeparatorChar the file separator character like <b>/</b> on Unix platforms.
     * @return the filename minus path
     */
    public static String removePath(final String filepath, final char fileSeparatorChar) {
        final int index = filepath.lastIndexOf(fileSeparatorChar);

        if (-1 == index) {
            return filepath;
        }

        return filepath.substring(index + 1);
    }

    /**
     * Get path from filename. Roughly equivalent to the unix command <code>dirname</code>. ie.
     *
     * <pre>
     * a/b/c.txt --&gt; a/b
     * a.txt     --&gt; ""
     * </pre>
     *
     * @param filepath the filepath
     * @return the filename minus path
     */
    public static String getPath(final String filepath) {
        return getPath(filepath, File.separatorChar);
    }

    /**
     * Get path from filename. ie.
     *
     * <pre>
     * a/b/c.txt --&gt; a/b
     * a.txt     --&gt; ""
     * </pre>
     *
     * @param filepath the filepath
     * @param fileSeparatorChar the file separator character like <b>/</b> on Unix platforms.
     * @return the filename minus path
     */
    public static String getPath(final String filepath, final char fileSeparatorChar) {
        final int index = filepath.lastIndexOf(fileSeparatorChar);
        if (-1 == index) {
            return "";
        }

        return filepath.substring(0, index);
    }

    /**
     * Copy file from source to destination. If <code>destinationDirectory</code> does not exist, it (and any parent
     * directories) will be created. If a file <code>source</code> in <code>destinationDirectory</code> exists, it will
     * be overwritten.
     *
     * @param source An existing <code>File</code> to copy.
     * @param destinationDirectory A directory to copy <code>source</code> into.
     * @throws java.io.FileNotFoundException if <code>source</code> isn't a normal file.
     * @throws IllegalArgumentException if <code>destinationDirectory</code> isn't a directory.
     * @throws IOException if <code>source</code> does not exist, the file in <code>destinationDirectory</code> cannot
     *             be written to, or an IO error occurs during copying.
     */
    public static void copyFileToDirectory(final String source, final String destinationDirectory) throws IOException {
        copyFileToDirectory(new File(source), new File(destinationDirectory));
    }

    /**
     * Copy file from source to destination only if source is newer than the target file. If
     * <code>destinationDirectory</code> does not exist, it (and any parent directories) will be created. If a file
     * <code>source</code> in <code>destinationDirectory</code> exists, it will be overwritten.
     *
     * @param source An existing <code>File</code> to copy.
     * @param destinationDirectory A directory to copy <code>source</code> into.
     * @throws java.io.FileNotFoundException if <code>source</code> isn't a normal file.
     * @throws IllegalArgumentException if <code>destinationDirectory</code> isn't a directory.
     * @throws IOException if <code>source</code> does not exist, the file in <code>destinationDirectory</code> cannot
     *             be written to, or an IO error occurs during copying.
     */
    public static void copyFileToDirectoryIfModified(final String source, final String destinationDirectory)
            throws IOException {
        copyFileToDirectoryIfModified(new File(source), new File(destinationDirectory));
    }

    /**
     * Copy file from source to destination. If <code>destinationDirectory</code> does not exist, it (and any parent
     * directories) will be created. If a file <code>source</code> in <code>destinationDirectory</code> exists, it will
     * be overwritten.
     *
     * @param source An existing <code>File</code> to copy.
     * @param destinationDirectory A directory to copy <code>source</code> into.
     * @throws java.io.FileNotFoundException if <code>source</code> isn't a normal file.
     * @throws IllegalArgumentException if <code>destinationDirectory</code> isn't a directory.
     * @throws IOException if <code>source</code> does not exist, the file in <code>destinationDirectory</code> cannot
     *             be written to, or an IO error occurs during copying.
     */
    public static void copyFileToDirectory(final File source, final File destinationDirectory) throws IOException {
        if (destinationDirectory.exists() && !destinationDirectory.isDirectory()) {
            throw new IllegalArgumentException("Destination is not a directory");
        }

        copyFile(source, new File(destinationDirectory, source.getName()));
    }

    /**
     * Copy file from source to destination only if source is newer than the target file. If
     * <code>destinationDirectory</code> does not exist, it (and any parent directories) will be created. If a file
     * <code>source</code> in <code>destinationDirectory</code> exists, it will be overwritten.
     *
     * @param source An existing <code>File</code> to copy.
     * @param destinationDirectory A directory to copy <code>source</code> into.
     * @throws java.io.FileNotFoundException if <code>source</code> isn't a normal file.
     * @throws IllegalArgumentException if <code>destinationDirectory</code> isn't a directory.
     * @throws IOException if <code>source</code> does not exist, the file in <code>destinationDirectory</code> cannot
     *             be written to, or an IO error occurs during copying.
     */
    public static void copyFileToDirectoryIfModified(final File source, final File destinationDirectory)
            throws IOException {
        if (destinationDirectory.exists() && !destinationDirectory.isDirectory()) {
            throw new IllegalArgumentException("Destination is not a directory");
        }

        copyFileIfModified(source, new File(destinationDirectory, source.getName()));
    }

    /**
     * Creates a number of directories, as delivered from DirectoryScanner
     *
     * @param sourceBase The basedir used for the directory scan
     * @param dirs The getIncludedDirs from the dirscanner
     * @param destination The base dir of the output structure
     * @throws IOException io issue
     */
    public static void mkDirs(final File sourceBase, String[] dirs, final File destination) throws IOException {
        for (String dir : dirs) {
            File src = new File(sourceBase, dir);
            File dst = new File(destination, dir);
            if (NioFiles.isSymbolicLink(src)) {
                File target = NioFiles.readSymbolicLink(src);
                NioFiles.createSymbolicLink(dst, target);
            } else {
                dst.mkdirs();
            }
        }
    }

    /**
     * Copy file from source to destination. The directories up to <code>destination</code> will be created if they
     * don't already exist. <code>destination</code> will be overwritten if it already exists.
     *
     * @param source An existing non-directory <code>File</code> to copy bytes from.
     * @param destination A non-directory <code>File</code> to write bytes to (possibly overwriting).
     * @throws IOException if <code>source</code> does not exist, <code>destination</code> cannot be written to, or an
     *             IO error occurs during copying.
     * @throws java.io.FileNotFoundException if <code>destination</code> is a directory (use
     *             {@link #copyFileToDirectory}).
     */
    public static void copyFile(final File source, final File destination) throws IOException {
        // check source exists
        if (!source.exists()) {
            final String message = "File " + source + " does not exist";
            throw new IOException(message);
        }

        // check source != destination, see PLXUTILS-10
        if (source.getCanonicalPath().equals(destination.getCanonicalPath())) {
            // if they are equal, we can exit the method without doing any work
            return;
        }
        mkdirsFor(destination);

        doCopyFile(source, destination);

        if (source.length() != destination.length()) {
            String message = "Failed to copy full contents from " + source + " to " + destination;
            throw new IOException(message);
        }
    }

    private static void doCopyFile(File source, File destination) throws IOException {
        doCopyFileUsingNewIO(source, destination);
    }

    private static void doCopyFileUsingNewIO(File source, File destination) throws IOException {
        NioFiles.copy(source, destination);
    }

    /**
     * Link file from destination to source. The directories up to <code>destination</code> will be created if they
     * don't already exist. <code>destination</code> will be overwritten if it already exists.
     *
     * @param source An existing non-directory <code>File</code> to link to.
     * @param destination A non-directory <code>File</code> becoming the link (possibly overwriting).
     * @throws IOException if <code>source</code> does not exist, <code>destination</code> cannot be created, or an
     *             IO error occurs during linking.
     * @throws java.io.FileNotFoundException if <code>destination</code> is a directory (use
     *             {@link #copyFileToDirectory}).
     */
    public static void linkFile(final File source, final File destination) throws IOException {
        // check source exists
        if (!source.exists()) {
            final String message = "File " + source + " does not exist";
            throw new IOException(message);
        }

        // check source != destination, see PLXUTILS-10
        if (source.getCanonicalPath().equals(destination.getCanonicalPath())) {
            // if they are equal, we can exit the method without doing any work
            return;
        }
        mkdirsFor(destination);

        NioFiles.createSymbolicLink(destination, source);
    }

    /**
     * Copy file from source to destination only if source timestamp is later than the destination timestamp. The
     * directories up to <code>destination</code> will be created if they don't already exist. <code>destination</code>
     * will be overwritten if it already exists.
     *
     * @param source An existing non-directory <code>File</code> to copy bytes from.
     * @param destination A non-directory <code>File</code> to write bytes to (possibly overwriting).
     * @return true if no problem occured
     * @throws IOException if <code>source</code> does not exist, <code>destination</code> cannot be written to, or an
     *             IO error occurs during copying.
     */
    public static boolean copyFileIfModified(final File source, final File destination) throws IOException {
        if (isSourceNewerThanDestination(source, destination)) {
            copyFile(source, destination);

            return true;
        }

        return false;
    }

    /**
     * Copies bytes from the URL <code>source</code> to a file <code>destination</code>. The directories up to
     * <code>destination</code> will be created if they don't already exist. <code>destination</code> will be
     * overwritten if it already exists.
     *
     * @param source A <code>URL</code> to copy bytes from.
     * @param destination A non-directory <code>File</code> to write bytes to (possibly overwriting).
     * @throws IOException if
     *             <ul>
     *             <li><code>source</code> URL cannot be opened</li>
     *             <li><code>destination</code> cannot be written to</li>
     *             <li>an IO error occurs during copying</li>
     *             </ul>
     */
    public static void copyURLToFile(final URL source, final File destination) throws IOException {
        copyStreamToFile(new URLInputStreamFacade(source), destination);
    }

    /**
     * Copies bytes from the {@link InputStream} <code>source</code> to a file <code>destination</code>. The directories
     * up to <code>destination</code> will be created if they don't already exist. <code>destination</code> will be
     * overwritten if it already exists.
     *
     * @param source An {@link InputStream} to copy bytes from. This stream is guaranteed to be closed.
     * @param destination A non-directory <code>File</code> to write bytes to (possibly overwriting).
     * @throws IOException if
     *             <ul>
     *             <li><code>source</code> URL cannot be opened</li>
     *             <li><code>destination</code> cannot be written to</li>
     *             <li>an IO error occurs during copying</li>
     *             </ul>
     */
    public static void copyStreamToFile(final InputStreamFacade source, final File destination) throws IOException {
        mkdirsFor(destination);
        checkCanWrite(destination);

        try (InputStream input = source.getInputStream();
                OutputStream output = Files.newOutputStream(destination.toPath())) {
            IOUtil.copy(input, output);
        }
    }

    private static void checkCanWrite(File destination) throws IOException {
        // make sure we can write to destination
        if (destination.exists() && !destination.canWrite()) {
            final String message = "Unable to open file " + destination + " for writing.";
            throw new IOException(message);
        }
    }

    private static void mkdirsFor(File destination) {
        // does destination directory exist ?
        File parentFile = destination.getParentFile();
        if (parentFile != null && !parentFile.exists()) {
            parentFile.mkdirs();
        }
    }

    /**
     * Normalize a path. Eliminates "/../" and "/./" in a string. Returns <code>null</code> if the ..'s went past the
     * root. Eg:
     *
     * <pre>
     * /foo//               --&gt;     /foo/
     * /foo/./              --&gt;     /foo/
     * /foo/../bar          --&gt;     /bar
     * /foo/../bar/         --&gt;     /bar/
     * /foo/../bar/../baz   --&gt;     /baz
     * //foo//./bar         --&gt;     /foo/bar
     * /../                 --&gt;     null
     * </pre>
     *
     * @param path the path to normalize
     * @return the normalized String, or <code>null</code> if too many ..'s.
     */
    public static String normalize(final String path) {
        String normalized = path;
        // Resolve occurrences of "//" in the normalized path
        while (true) {
            int index = normalized.indexOf("//");
            if (index < 0) {
                break;
            }
            normalized = normalized.substring(0, index) + normalized.substring(index + 1);
        }

        // Resolve occurrences of "/./" in the normalized path
        while (true) {
            int index = normalized.indexOf("/./");
            if (index < 0) {
                break;
            }
            normalized = normalized.substring(0, index) + normalized.substring(index + 2);
        }

        // Resolve occurrences of "/../" in the normalized path
        while (true) {
            int index = normalized.indexOf("/../");
            if (index < 0) {
                break;
            }
            if (index == 0) {
                return null; // Trying to go outside our context
            }
            int index2 = normalized.lastIndexOf('/', index - 1);
            normalized = normalized.substring(0, index2) + normalized.substring(index + 3);
        }

        // Return the normalized path that we have completed
        return normalized;
    }

    /**
     * <p>Will concatenate 2 paths. Paths with <code>..</code> will be properly handled.</p>
     *
     * Eg.,
     * <pre>
     * /a/b/c + d = /a/b/d
     * /a/b/c + ../d = /a/d
     * </pre>
     *
     * <p>Thieved from Tomcat sources...</p>
     *
     * @param lookupPath a path
     * @param path the path to concatenate
     * @return The concatenated paths, or null if error occurs
     */
    public static String catPath(final String lookupPath, final String path) {
        // Cut off the last slash and everything beyond
        int index = lookupPath.lastIndexOf("/");
        String lookup = lookupPath.substring(0, index);
        String pth = path;

        // Deal with .. by chopping dirs off the lookup path
        while (pth.startsWith("../")) {
            if (lookup.length() > 0) {
                index = lookup.lastIndexOf("/");
                lookup = lookup.substring(0, index);
            } else {
                // More ..'s than dirs, return null
                return null;
            }

            index = pth.indexOf("../") + 3;
            pth = pth.substring(index);
        }

        return new StringBuffer(lookup).append("/").append(pth).toString();
    }

    /**
     * Resolve a file <code>filename</code> to it's canonical form. If <code>filename</code> is relative (doesn't start
     * with <code>/</code>), it will be resolved relative to <code>baseFile</code>, otherwise it is treated as a normal
     * root-relative path.
     *
     * @param baseFile Where to resolve <code>filename</code> from, if <code>filename</code> is relative.
     * @param filename Absolute or relative file path to resolve.
     * @return The canonical <code>File</code> of <code>filename</code>.
     */
    public static File resolveFile(final File baseFile, String filename) {
        String filenm = filename;
        if ('/' != File.separatorChar) {
            filenm = filename.replace('/', File.separatorChar);
        }

        if ('\\' != File.separatorChar) {
            filenm = filename.replace('\\', File.separatorChar);
        }

        // deal with absolute files
        if (filenm.startsWith(File.separator) || (Os.isFamily(Os.FAMILY_WINDOWS) && filenm.indexOf(":") > 0)) {
            File file = new File(filenm);

            try {
                file = file.getCanonicalFile();
            } catch (final IOException ioe) {
                // nop
            }

            return file;
        }
        // FIXME: I'm almost certain this // removal is unnecessary, as getAbsoluteFile() strips
        // them. However, I'm not sure about this UNC stuff. (JT)
        final char[] chars = filename.toCharArray();
        final StringBuilder sb = new StringBuilder();

        // remove duplicate file separators in succession - except
        // on win32 at start of filename as UNC filenames can
        // be \\AComputer\AShare\myfile.txt
        int start = 0;
        if ('\\' == File.separatorChar) {
            sb.append(filenm.charAt(0));
            start++;
        }

        for (int i = start; i < chars.length; i++) {
            final boolean doubleSeparator = File.separatorChar == chars[i] && File.separatorChar == chars[i - 1];

            if (!doubleSeparator) {
                sb.append(chars[i]);
            }
        }

        filenm = sb.toString();

        // must be relative
        File file = (new File(baseFile, filenm)).getAbsoluteFile();

        try {
            file = file.getCanonicalFile();
        } catch (final IOException ioe) {
            // nop
        }

        return file;
    }

    /**
     * Delete a file. If file is directory delete it and all sub-directories.
     *
     * @param file the file path
     * @throws IOException if any
     */
    public static void forceDelete(final String file) throws IOException {
        forceDelete(new File(file));
    }

    /**
     * Delete a file. If file is directory delete it and all sub-directories.
     *
     * @param file a file
     * @throws IOException if any
     */
    public static void forceDelete(final File file) throws IOException {
        if (file.isDirectory()) {
            deleteDirectory(file);
        } else {
            /*
             * NOTE: Always try to delete the file even if it appears to be non-existent. This will ensure that a
             * symlink whose target does not exist is deleted, too.
             */
            boolean filePresent = file.getCanonicalFile().exists();
            if (!deleteFile(file) && filePresent) {
                final String message = "File " + file + " unable to be deleted.";
                throw new IOException(message);
            }
        }
    }

    /**
     * Accommodate Windows bug encountered in both Sun and IBM JDKs. Others possible. If the delete does not work, call
     * System.gc(), wait a little and try again.
     *
     * @param file a file
     * @throws IOException if any
     */
    private static boolean deleteFile(File file) throws IOException {
        if (file.isDirectory()) {
            throw new IOException("File " + file + " isn't a file.");
        }

        if (!file.delete()) {
            if (Os.isFamily(Os.FAMILY_WINDOWS)) {
                file = file.getCanonicalFile();
                System.gc();
            }

            try {
                Thread.sleep(10);
                return file.delete();
            } catch (InterruptedException ignore) {
                return file.delete();
            }
        }

        return true;
    }

    /**
     * Schedule a file to be deleted when JVM exits. If file is directory delete it and all sub-directories.
     *
     * @param file a file
     * @throws IOException if any
     */
    public static void forceDeleteOnExit(final File file) throws IOException {
        if (!file.exists()) {
            return;
        }

        if (file.isDirectory()) {
            deleteDirectoryOnExit(file);
        } else {
            file.deleteOnExit();
        }
    }

    /**
     * Recursively schedule directory for deletion on JVM exit.
     *
     * @param directory a directory
     * @throws IOException if any
     */
    private static void deleteDirectoryOnExit(final File directory) throws IOException {
        if (!directory.exists()) {
            return;
        }
        directory.deleteOnExit(); // The hook reverses the list

        cleanDirectoryOnExit(directory);
    }

    /**
     * Clean a directory without deleting it.
     *
     * @param directory a directory
     * @throws IOException if any
     */
    private static void cleanDirectoryOnExit(final File directory) throws IOException {
        if (!directory.exists()) {
            final String message = directory + " does not exist";
            throw new IllegalArgumentException(message);
        }

        if (!directory.isDirectory()) {
            final String message = directory + " is not a directory";
            throw new IllegalArgumentException(message);
        }

        IOException exception = null;

        final File[] files = directory.listFiles();
        for (final File file : files) {
            try {
                forceDeleteOnExit(file);
            } catch (final IOException ioe) {
                exception = ioe;
            }
        }

        if (null != exception) {
            throw exception;
        }
    }

    /**
     * Make a directory.
     *
     * @param file not null
     * @throws IOException If there already exists a file with specified name or the directory is unable to be created
     * @throws IllegalArgumentException if the file contains illegal Windows characters under Windows OS.
     * @see #INVALID_CHARACTERS_FOR_WINDOWS_FILE_NAME
     */
    public static void forceMkdir(final File file) throws IOException {
        if (Os.isFamily(Os.FAMILY_WINDOWS)) {
            if (!isValidWindowsFileName(file)) {
                throw new IllegalArgumentException("The file (" + file.getAbsolutePath()
                        + ") cannot contain any of the following characters: \n"
                        + StringUtils.join(INVALID_CHARACTERS_FOR_WINDOWS_FILE_NAME, " "));
            }
        }

        if (file.exists()) {
            if (file.isFile()) {
                final String message =
                        "File " + file + " exists and is " + "not a directory. Unable to create directory.";
                throw new IOException(message);
            }
        } else {
            if (false == file.mkdirs()) {
                final String message = "Unable to create directory " + file;
                throw new IOException(message);
            }
        }
    }

    /**
     * Recursively delete a directory.
     *
     * @param directory a directory
     * @throws IOException if any
     */
    public static void deleteDirectory(final String directory) throws IOException {
        deleteDirectory(new File(directory));
    }

    /**
     * Recursively delete a directory.
     *
     * @param directory a directory
     * @throws IOException if any
     */
    public static void deleteDirectory(final File directory) throws IOException {
        if (!directory.exists()) {
            return;
        }

        /*
         * try delete the directory before its contents, which will take care of any directories that are really
         * symbolic links.
         */
        if (directory.delete()) {
            return;
        }

        cleanDirectory(directory);
        if (!directory.delete()) {
            final String message = "Directory " + directory + " unable to be deleted.";
            throw new IOException(message);
        }
    }

    /**
     * Clean a directory without deleting it.
     *
     * @param directory a directory
     * @throws IOException if any
     */
    public static void cleanDirectory(final String directory) throws IOException {
        cleanDirectory(new File(directory));
    }

    /**
     * Clean a directory without deleting it.
     *
     * @param directory a directory
     * @throws IOException if any
     */
    public static void cleanDirectory(final File directory) throws IOException {
        if (!directory.exists()) {
            final String message = directory + " does not exist";
            throw new IllegalArgumentException(message);
        }

        if (!directory.isDirectory()) {
            final String message = directory + " is not a directory";
            throw new IllegalArgumentException(message);
        }

        IOException exception = null;

        final File[] files = directory.listFiles();

        if (files == null) {
            return;
        }

        for (final File file : files) {
            try {
                forceDelete(file);
            } catch (final IOException ioe) {
                exception = ioe;
            }
        }

        if (null != exception) {
            throw exception;
        }
    }

    /**
     * Recursively count size of a directory.
     *
     * @param directory a directory
     * @return size of directory in bytes.
     */
    public static long sizeOfDirectory(final String directory) {
        return sizeOfDirectory(new File(directory));
    }

    /**
     * Recursively count size of a directory.
     *
     * @param directory a directory
     * @return size of directory in bytes.
     */
    public static long sizeOfDirectory(final File directory) {
        if (!directory.exists()) {
            final String message = directory + " does not exist";
            throw new IllegalArgumentException(message);
        }

        if (!directory.isDirectory()) {
            final String message = directory + " is not a directory";
            throw new IllegalArgumentException(message);
        }

        long size = 0;

        final File[] files = directory.listFiles();
        for (final File file : files) {
            if (file.isDirectory()) {
                size += sizeOfDirectory(file);
            } else {
                size += file.length();
            }
        }

        return size;
    }

    /**
     * Return the files contained in the directory, using inclusion and exclusion Ant patterns, including the directory
     * name in each of the files
     *
     * @param directory the directory to scan
     * @param includes the includes pattern, comma separated
     * @param excludes the excludes pattern, comma separated
     * @return a list of File objects
     * @throws IOException io issue
     * @see #getFileNames(File, String, String, boolean)
     */
    public static List<File> getFiles(File directory, String includes, String excludes) throws IOException {
        return getFiles(directory, includes, excludes, true);
    }

    /**
     * Return the files contained in the directory, using inclusion and exclusion Ant patterns
     *
     * @param directory the directory to scan
     * @param includes the includes pattern, comma separated
     * @param excludes the excludes pattern, comma separated
     * @param includeBasedir true to include the base dir in each file
     * @return a list of File objects
     * @throws IOException io issue
     * @see #getFileNames(File, String, String, boolean)
     */
    public static List<File> getFiles(File directory, String includes, String excludes, boolean includeBasedir)
            throws IOException {
        List<String> fileNames = getFileNames(directory, includes, excludes, includeBasedir);

        List<File> files = new ArrayList<File>();

        for (String filename : fileNames) {
            files.add(new File(filename));
        }

        return files;
    }

    /**
     * Return a list of files as String depending options. This method use case sensitive file name.
     *
     * @param directory the directory to scan
     * @param includes the includes pattern, comma separated
     * @param excludes the excludes pattern, comma separated
     * @param includeBasedir true to include the base dir in each String of file
     * @return a list of files as String
     * @throws IOException io issue
     */
    public static List<String> getFileNames(File directory, String includes, String excludes, boolean includeBasedir)
            throws IOException {
        return getFileNames(directory, includes, excludes, includeBasedir, true);
    }

    /**
     * Return a list of files as String depending options.
     *
     * @param directory the directory to scan
     * @param includes the includes pattern, comma separated
     * @param excludes the excludes pattern, comma separated
     * @param includeBasedir true to include the base dir in each String of file
     * @param isCaseSensitive true if case sensitive
     * @return a list of files as String
     * @throws IOException io issue
     */
    public static List<String> getFileNames(
            File directory, String includes, String excludes, boolean includeBasedir, boolean isCaseSensitive)
            throws IOException {
        return getFileAndDirectoryNames(directory, includes, excludes, includeBasedir, isCaseSensitive, true, false);
    }

    /**
     * Return a list of directories as String depending options. This method use case sensitive file name.
     *
     * @param directory the directory to scan
     * @param includes the includes pattern, comma separated
     * @param excludes the excludes pattern, comma separated
     * @param includeBasedir true to include the base dir in each String of file
     * @return a list of directories as String
     * @throws IOException io issue
     */
    public static List<String> getDirectoryNames(
            File directory, String includes, String excludes, boolean includeBasedir) throws IOException {
        return getDirectoryNames(directory, includes, excludes, includeBasedir, true);
    }

    /**
     * Return a list of directories as String depending options.
     *
     * @param directory the directory to scan
     * @param includes the includes pattern, comma separated
     * @param excludes the excludes pattern, comma separated
     * @param includeBasedir true to include the base dir in each String of file
     * @param isCaseSensitive true if case sensitive
     * @return a list of directories as String
     * @throws IOException io issue
     */
    public static List<String> getDirectoryNames(
            File directory, String includes, String excludes, boolean includeBasedir, boolean isCaseSensitive)
            throws IOException {
        return getFileAndDirectoryNames(directory, includes, excludes, includeBasedir, isCaseSensitive, false, true);
    }

    /**
     * Return a list of files as String depending options.
     *
     * @param directory the directory to scan
     * @param includes the includes pattern, comma separated
     * @param excludes the excludes pattern, comma separated
     * @param includeBasedir true to include the base dir in each String of file
     * @param isCaseSensitive true if case sensitive
     * @param getFiles true if get files
     * @param getDirectories true if get directories
     * @return a list of files as String
     * @throws IOException io issue
     */
    public static List<String> getFileAndDirectoryNames(
            File directory,
            String includes,
            String excludes,
            boolean includeBasedir,
            boolean isCaseSensitive,
            boolean getFiles,
            boolean getDirectories)
            throws IOException {
        DirectoryScanner scanner = new DirectoryScanner();

        scanner.setBasedir(directory);

        if (includes != null) {
            scanner.setIncludes(StringUtils.split(includes, ","));
        }

        if (excludes != null) {
            scanner.setExcludes(StringUtils.split(excludes, ","));
        }

        scanner.setCaseSensitive(isCaseSensitive);

        scanner.scan();

        List<String> list = new ArrayList<String>();

        if (getFiles) {
            String[] files = scanner.getIncludedFiles();

            for (String file : files) {
                if (includeBasedir) {
                    list.add(directory + FileUtils.FS + file);
                } else {
                    list.add(file);
                }
            }
        }

        if (getDirectories) {
            String[] directories = scanner.getIncludedDirectories();

            for (String directory1 : directories) {
                if (includeBasedir) {
                    list.add(directory + FileUtils.FS + directory1);
                } else {
                    list.add(directory1);
                }
            }
        }

        return list;
    }

    /**
     * Copy a directory to an other one.
     *
     * @param sourceDirectory the source dir
     * @param destinationDirectory the target dir
     * @throws IOException if any
     */
    public static void copyDirectory(File sourceDirectory, File destinationDirectory) throws IOException {
        copyDirectory(sourceDirectory, destinationDirectory, "**", null);
    }

    /**
     * Copy a directory to an other one.
     *
     * @param sourceDirectory the source dir
     * @param destinationDirectory the target dir
     * @param includes include pattern
     * @param excludes exclude pattern
     * @throws IOException if any
     * @see #getFiles(File, String, String)
     */
    public static void copyDirectory(File sourceDirectory, File destinationDirectory, String includes, String excludes)
            throws IOException {
        if (!sourceDirectory.exists()) {
            return;
        }

        List<File> files = getFiles(sourceDirectory, includes, excludes);

        for (File file : files) {
            copyFileToDirectory(file, destinationDirectory);
        }
    }

    /**
     * <p>Copies a entire directory layout : no files will be copied only directories</p>
     *
     * Note:
     * <ul>
     * <li>It will include empty directories.
     * <li>The <code>sourceDirectory</code> must exists.
     * </ul>
     *
     * @param sourceDirectory the source dir
     * @param destinationDirectory the target dir
     * @param includes include pattern
     * @param excludes exclude pattern
     * @throws IOException if any
     * @since 1.5.7
     */
    public static void copyDirectoryLayout(
            File sourceDirectory, File destinationDirectory, String[] includes, String[] excludes) throws IOException {
        if (sourceDirectory == null) {
            throw new IOException("source directory can't be null.");
        }

        if (destinationDirectory == null) {
            throw new IOException("destination directory can't be null.");
        }

        if (sourceDirectory.equals(destinationDirectory)) {
            throw new IOException("source and destination are the same directory.");
        }

        if (!sourceDirectory.exists()) {
            throw new IOException("Source directory doesn't exists (" + sourceDirectory.getAbsolutePath() + ").");
        }

        DirectoryScanner scanner = new DirectoryScanner();

        scanner.setBasedir(sourceDirectory);

        if (includes != null && includes.length >= 1) {
            scanner.setIncludes(includes);
        } else {
            scanner.setIncludes(new String[] {"**"});
        }

        if (excludes != null && excludes.length >= 1) {
            scanner.setExcludes(excludes);
        }

        scanner.addDefaultExcludes();
        scanner.scan();
        List<String> includedDirectories = Arrays.asList(scanner.getIncludedDirectories());

        for (String name : includedDirectories) {
            File source = new File(sourceDirectory, name);

            if (source.equals(sourceDirectory)) {
                continue;
            }

            File destination = new File(destinationDirectory, name);
            destination.mkdirs();
        }
    }

    /**
     * <p>Copies a entire directory structure.</p>
     *
     * Note:
     * <ul>
     * <li>It will include empty directories.
     * <li>The <code>sourceDirectory</code> must exists.
     * </ul>
     *
     * @param sourceDirectory the source dir
     * @param destinationDirectory the target dir
     * @throws IOException if any
     */
    public static void copyDirectoryStructure(File sourceDirectory, File destinationDirectory) throws IOException {
        copyDirectoryStructure(sourceDirectory, destinationDirectory, destinationDirectory, false);
    }

    /**
     * <p>Copies an entire directory structure but only source files with timestamp later than the destinations'.</p>
     *
     * Note:
     * <ul>
     * <li>It will include empty directories.
     * <li>The <code>sourceDirectory</code> must exists.
     * </ul>
     *
     * @param sourceDirectory the source dir
     * @param destinationDirectory the target dir
     * @throws IOException if any
     */
    public static void copyDirectoryStructureIfModified(File sourceDirectory, File destinationDirectory)
            throws IOException {
        copyDirectoryStructure(sourceDirectory, destinationDirectory, destinationDirectory, true);
    }

    private static void copyDirectoryStructure(
            File sourceDirectory, File destinationDirectory, File rootDestinationDirectory, boolean onlyModifiedFiles)
            throws IOException {
        if (sourceDirectory == null) {
            throw new IOException("source directory can't be null.");
        }

        if (destinationDirectory == null) {
            throw new IOException("destination directory can't be null.");
        }

        if (sourceDirectory.equals(destinationDirectory)) {
            throw new IOException("source and destination are the same directory.");
        }

        if (!sourceDirectory.exists()) {
            throw new IOException("Source directory doesn't exists (" + sourceDirectory.getAbsolutePath() + ").");
        }

        File[] files = sourceDirectory.listFiles();

        String sourcePath = sourceDirectory.getAbsolutePath();

        for (File file : files) {
            if (file.equals(rootDestinationDirectory)) {
                // We don't copy the destination directory in itself
                continue;
            }

            String dest = file.getAbsolutePath();

            dest = dest.substring(sourcePath.length() + 1);

            File destination = new File(destinationDirectory, dest);

            if (file.isFile()) {
                destination = destination.getParentFile();

                if (onlyModifiedFiles) {
                    copyFileToDirectoryIfModified(file, destination);
                } else {
                    copyFileToDirectory(file, destination);
                }
            } else if (file.isDirectory()) {
                if (!destination.exists() && !destination.mkdirs()) {
                    throw new IOException(
                            "Could not create destination directory '" + destination.getAbsolutePath() + "'.");
                }

                copyDirectoryStructure(file, destination, rootDestinationDirectory, onlyModifiedFiles);
            } else {
                throw new IOException("Unknown file type: " + file.getAbsolutePath());
            }
        }
    }

    /**
     * <p>Renames a file, even if that involves crossing file system boundaries.</p>
     *
     * <p>This will remove <code>to</code> (if it exists), ensure that <code>to</code>'s parent directory exists and move
     * <code>from</code>, which involves deleting <code>from</code> as well.</p>
     *
     * @param from the file to move
     * @param to the new file name
     * @throws IOException if anything bad happens during this process. Note that <code>to</code> may have been deleted
     *             already when this happens.
     */
    public static void rename(File from, File to) throws IOException {
        if (to.exists() && !to.delete()) {
            throw new IOException("Failed to delete " + to + " while trying to rename " + from);
        }

        File parent = to.getParentFile();
        if (parent != null && !parent.exists() && !parent.mkdirs()) {
            throw new IOException("Failed to create directory " + parent + " while trying to rename " + from);
        }

        if (!from.renameTo(to)) {
            copyFile(from, to);
            if (!from.delete()) {
                throw new IOException("Failed to delete " + from + " while trying to rename it.");
            }
        }
    }

    /**
     * <p>Create a temporary file in a given directory.</p>
     *
     * <p>The file denoted by the returned abstract pathname did not exist before this method was invoked, any subsequent
     * invocation of this method will yield a different file name.</p>
     *
     * <p>The filename is prefixNNNNNsuffix where NNNN is a random number</p>
     *
     * <p>This method is different to {@link File#createTempFile(String, String, File)} of JDK 1.2 as it doesn't create the
     * file itself. It uses the location pointed to by java.io.tmpdir when the parentDir attribute is null.</p>
     *
     * <p>To delete automatically the file created by this method, use the {@link File#deleteOnExit()} method.</p>
     *
     * @param prefix prefix before the random number
     * @param suffix file extension; include the '.'
     * @param parentDir Directory to create the temporary file in <code>-java.io.tmpdir</code> used if not specificed
     * @return a File reference to the new temporary file.
     */
    public static File createTempFile(String prefix, String suffix, File parentDir) {
        File result = null;
        String parent = System.getProperty("java.io.tmpdir");
        if (parentDir != null) {
            parent = parentDir.getPath();
        }
        DecimalFormat fmt = new DecimalFormat("#####");
        SecureRandom secureRandom = new SecureRandom();
        long secureInitializer = secureRandom.nextLong();
        Random rand = new Random(secureInitializer + Runtime.getRuntime().freeMemory());
        synchronized (rand) {
            do {
                result = new File(parent, prefix + fmt.format(Math.abs(rand.nextInt())) + suffix);
            } while (result.exists());
        }

        return result;
    }

    /**
     * <b>If wrappers is null or empty, the file will be copy only if {@code to.lastModified() < from.lastModified()}</b>
     *
     * @param from the file to copy
     * @param to the destination file
     * @param encoding the file output encoding (only if wrappers is not empty)
     * @param wrappers array of {@link FilterWrapper}
     * @throws IOException if an IO error occurs during copying or filtering
     */
    public static void copyFile(File from, File to, String encoding, FilterWrapper[] wrappers) throws IOException {
        copyFile(from, to, encoding, wrappers, false);
    }

    public abstract static class FilterWrapper {
        public abstract Reader getReader(Reader fileReader);
    }

    /**
     * <b>If wrappers is null or empty, the file will be copy only if {@code to.lastModified() < from.lastModified()}, if overwrite is true</b>
     *
     * @param from the file to copy
     * @param to the destination file
     * @param encoding the file output encoding (only if wrappers is not empty)
     * @param wrappers array of {@link FilterWrapper}
     * @param overwrite if true and wrappers is null or empty, the file will be copied even if {@code to.lastModified() < from.lastModified()}
     * @throws IOException if an IO error occurs during copying or filtering
     * @since 1.5.2
     */
    public static void copyFile(File from, File to, String encoding, FilterWrapper[] wrappers, boolean overwrite)
            throws IOException {
        if (wrappers != null && wrappers.length > 0) {
            // buffer so it isn't reading a byte at a time!
            Reader fileReader = null;
            Writer fileWriter = null;
            try {
                if (encoding == null || encoding.length() < 1) {
                    fileReader = Files.newBufferedReader(from.toPath());
                    fileWriter = Files.newBufferedWriter(to.toPath());
                } else {
                    OutputStream outstream = Files.newOutputStream(to.toPath());

                    fileReader = Files.newBufferedReader(from.toPath(), Charset.forName(encoding));

                    fileWriter = new OutputStreamWriter(outstream, encoding);
                }

                Reader reader = fileReader;
                for (FilterWrapper wrapper : wrappers) {
                    reader = wrapper.getReader(reader);
                }

                IOUtil.copy(reader, fileWriter);
                fileWriter.close();
                fileWriter = null;
                fileReader.close();
                fileReader = null;
            } finally {
                IOUtil.close(fileReader);
                IOUtil.close(fileWriter);
            }
        } else {
            if (isSourceNewerThanDestination(from, to) || overwrite) {
                copyFile(from, to);
            }
        }
    }

    private static boolean isSourceNewerThanDestination(File source, File destination) {
        return (destination.lastModified() == 0L && source.lastModified() == 0L)
                || destination.lastModified() < source.lastModified();
    }

    /**
     * Note: the file content is read with platform encoding
     *
     * @param file the file
     * @return a List containing every every line not starting with # and not empty
     * @throws IOException if any
     */
    public static List<String> loadFile(File file) throws IOException {
        final List<String> lines = new ArrayList<String>();

        if (file.exists()) {
            try (BufferedReader reader = Files.newBufferedReader(file.toPath())) {
                for (String line = reader.readLine(); line != null; line = reader.readLine()) {
                    line = line.trim();

                    if (!line.startsWith("#") && line.length() != 0) {
                        lines.add(line);
                    }
                }
            }
        }

        return lines;
    }

    /**
     * For Windows OS, check if the file name contains any of the following characters:
     * <code>":", "*", "?", "\"", "&lt;", "&gt;", "|"</code>
     *
     * @param f not null file
     * @return <code>false</code> if the file path contains any of forbidden Windows characters, <code>true</code> if
     *         the Os is not Windows or if the file path respect the Windows constraints.
     * @see #INVALID_CHARACTERS_FOR_WINDOWS_FILE_NAME
     * @since 1.5.2
     */
    public static boolean isValidWindowsFileName(File f) {
        if (Os.isFamily(Os.FAMILY_WINDOWS)) {
            if (StringUtils.indexOfAny(f.getName(), INVALID_CHARACTERS_FOR_WINDOWS_FILE_NAME) != -1) {
                return false;
            }

            File parentFile = f.getParentFile();
            if (parentFile != null) {
                return isValidWindowsFileName(parentFile);
            }
        }

        return true;
    }
}