Do less path string manipulation

to avoid windows-specific issues with patch application.

RELNOTES: N/A

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=156451545

check_api/src/main/java/com/google/errorprone/RefactoringCollection.java

@@ -82,7 +82,7 @@ static RefactoringCollection refactor(PatchingOptions patchingOptions) {
     Function<URI, RefactoringResult> postProcess;
 
     if (patchingOptions.inPlace()) {
-      fileDestination = new FsFileDestination(rootPath);
+      fileDestination = new FsFileDestination();
       postProcess =
           uri ->
               RefactoringResult.create(
@@ -160,7 +160,7 @@ RefactoringResult applyChanges(URI uri) throws Exception {
       return RefactoringResult.create("", RefactoringResultType.NO_CHANGES);
     }
 
-    doApplyProcess(fileDestination, new FsFileSource(rootPath), listeners);
+    doApplyProcess(fileDestination, new FsFileSource(), listeners);
     return postProcess.apply(uri);
   }
 
@@ -186,19 +186,16 @@ private void doApplyProcess(
       Collection<DelegatingDescriptionListener> listeners) {
     for (DelegatingDescriptionListener listener : listeners) {
       try {
-        SourceFile file = fileSource.readFile(listener.base.getRelevantFileName());
+        SourceFile file = fileSource.readFile(listener.base.getPath());
         listener.base.applyDifferences(file);
         fileDestination.writeFile(file);
       } catch (IOException e) {
-        logger.log(
-            Level.WARNING,
-            "Failed to apply diff to file " + listener.base.getRelevantFileName(),
-            e);
+        logger.log(Level.WARNING, "Failed to apply diff to file " + listener.base.getPath(), e);
       }
     }
   }
 
-  private final class DelegatingDescriptionListener implements DescriptionListener {
+  private static final class DelegatingDescriptionListener implements DescriptionListener {
     final DescriptionBasedDiff base;
     final DescriptionListener listener;
 

check_api/src/main/java/com/google/errorprone/apply/DescriptionBasedDiff.java

@@ -25,6 +25,8 @@
 import com.google.errorprone.matchers.Description;
 import com.sun.tools.javac.tree.EndPosTable;
 import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.LinkedHashSet;
 import java.util.Set;
 
@@ -38,7 +40,7 @@
  */
 public final class DescriptionBasedDiff implements DescriptionListener, Diff {
 
-  private final String sourcePath;
+  private final Path sourcePath;
   private final boolean ignoreOverlappingFixes;
   private final JCCompilationUnit compilationUnit;
   private final Set<String> importsToAdd;
@@ -62,7 +64,7 @@ private DescriptionBasedDiff(
       boolean ignoreOverlappingFixes,
       ImportOrganizer importOrganizer) {
     this.compilationUnit = checkNotNull(compilationUnit);
-    this.sourcePath = compilationUnit.getSourceFile().toUri().getPath();
+    this.sourcePath = Paths.get(compilationUnit.getSourceFile().toUri());
     this.ignoreOverlappingFixes = ignoreOverlappingFixes;
     this.importsToAdd = new LinkedHashSet<>();
     this.importsToRemove = new LinkedHashSet<>();
@@ -71,7 +73,7 @@ private DescriptionBasedDiff(
   }
 
   @Override
-  public String getRelevantFileName() {
+  public Path getPath() {
     return sourcePath;
   }
 

check_api/src/main/java/com/google/errorprone/apply/Diff.java

@@ -16,14 +16,16 @@
 
 package com.google.errorprone.apply;
 
+import java.nio.file.Path;
+
 /**
  * All the differences to be applied to a source file to be applied in a refactoring.
  *
  * @author sjnickerson@google.com (Simon Nickerson)
  */
 public interface Diff {
-  /** Gets the name of the file this difference applies to */
-  public String getRelevantFileName();
+  /** Gets the path of the file this difference applies to */
+  public Path getPath();
 
   /**
    * Applies this difference to the supplied {@code sourceFile}.

check_api/src/main/java/com/google/errorprone/apply/DiffApplier.java

@@ -20,6 +20,7 @@
 import com.google.common.collect.Sets;
 import com.google.common.util.concurrent.AbstractService;
 import java.io.IOException;
+import java.nio.file.Path;
 import java.util.Set;
 import java.util.concurrent.ArrayBlockingQueue;
 import java.util.concurrent.ConcurrentSkipListSet;
@@ -40,8 +41,8 @@
 public class DiffApplier extends AbstractService {
   private static final Logger logger = Logger.getLogger(DiffApplier.class.getName());
   private final ExecutorService workerService;
-  private final Set<String> refactoredPaths;
-  private final Set<String> diffsFailedPaths;
+  private final Set<Path> refactoredPaths;
+  private final Set<Path> diffsFailedPaths;
   private final FileSource source;
   private final FileDestination destination;
   private final AtomicInteger completedFiles;
@@ -67,7 +68,7 @@ public DiffApplier(int diffParallelism, FileSource source, FileDestination desti
             diffParallelism,
             5,
             TimeUnit.SECONDS,
-            new ArrayBlockingQueue<Runnable>(50),
+            new ArrayBlockingQueue<>(50),
             new ThreadPoolExecutor.CallerRunsPolicy());
   }
 
@@ -114,7 +115,7 @@ private final class Task implements Runnable {
     @Override
     public void run() {
       try {
-        SourceFile file = source.readFile(diff.getRelevantFileName());
+        SourceFile file = source.readFile(diff.getPath());
         diff.applyDifferences(file);
         destination.writeFile(file);
 
@@ -123,16 +124,16 @@ public void run() {
           logger.log(Level.INFO, String.format("Completed %d files in %s", completed, stopwatch));
         }
       } catch (IOException | DiffNotApplicableException e) {
-        logger.log(Level.WARNING, "Failed to apply diff to file " + diff.getRelevantFileName(), e);
-        diffsFailedPaths.add(diff.getRelevantFileName());
+        logger.log(Level.WARNING, "Failed to apply diff to file " + diff.getPath(), e);
+        diffsFailedPaths.add(diff.getPath());
       } finally {
         decrementTasks();
       }
     }
   }
 
   public Future<?> put(Diff diff) {
-    if (refactoredPaths.add(diff.getRelevantFileName())) {
+    if (refactoredPaths.add(diff.getPath())) {
       runState.incrementAndGet();
       return workerService.submit(new Task(diff));
     }

check_api/src/main/java/com/google/errorprone/apply/FileSource.java

@@ -17,9 +17,10 @@
 package com.google.errorprone.apply;
 
 import java.io.IOException;
+import java.nio.file.Path;
 
 /** @author sjnickerson@google.com (Simon Nickerson) */
 public interface FileSource {
 
-  SourceFile readFile(String path) throws IOException;
+  SourceFile readFile(Path path) throws IOException;
 }

check_api/src/main/java/com/google/errorprone/apply/FsFileDestination.java

@@ -19,21 +19,13 @@
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
-import java.nio.file.Path;
 
 /** A {@link FileDestination} that writes content to a destination on the local filesystem. */
 public final class FsFileDestination implements FileDestination {
 
-  private final Path rootPath;
-
-  public FsFileDestination(Path rootPath) {
-    this.rootPath = rootPath;
-  }
-
   @Override
   public void writeFile(SourceFile update) throws IOException {
-    Path targetPath = rootPath.resolve(update.getPath());
-    Files.write(targetPath, update.getSourceText().getBytes(StandardCharsets.UTF_8));
+    Files.write(update.getPath(), update.getSourceText().getBytes(StandardCharsets.UTF_8));
   }
 
   @Override

check_api/src/main/java/com/google/errorprone/apply/FsFileSource.java

@@ -24,15 +24,8 @@
 /** A FileSource that reads source files from the local filesystem. */
 public final class FsFileSource implements FileSource {
 
-  private final Path rootPath;
-
-  public FsFileSource(Path rootPath) {
-    this.rootPath = rootPath;
-  }
-
   @Override
-  public SourceFile readFile(String path) throws IOException {
-    return new SourceFile(
-        path, new String(Files.readAllBytes(rootPath.resolve(path)), StandardCharsets.UTF_8));
+  public SourceFile readFile(Path path) throws IOException {
+    return new SourceFile(path, new String(Files.readAllBytes(path), StandardCharsets.UTF_8));
   }
 }

check_api/src/main/java/com/google/errorprone/apply/SourceFile.java

@@ -23,6 +23,8 @@
 import java.io.LineNumberReader;
 import java.io.StringReader;
 import java.nio.CharBuffer;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.List;
 import javax.tools.JavaFileObject;
@@ -37,20 +39,26 @@
  */
 public class SourceFile {
 
-  private final String path;
+  private final Path path;
   private final StringBuilder sourceBuilder;
 
   public static SourceFile create(JavaFileObject fileObject) throws IOException {
-    return new SourceFile(fileObject.toUri().getPath(), fileObject.getCharContent(false));
+    Path path;
+    try {
+      path = Paths.get(fileObject.toUri());
+    } catch (IllegalArgumentException e) {
+      throw new IllegalArgumentException(fileObject.toUri().toString(), e);
+    }
+    return new SourceFile(path, fileObject.getCharContent(false));
   }
 
-  public SourceFile(String path, CharSequence source) {
+  public SourceFile(Path path, CharSequence source) {
     this.path = path;
     sourceBuilder = new StringBuilder(source);
   }
 
   /** Returns the path for this source file */
-  public String getPath() {
+  public Path getPath() {
     return path;
   }
 

check_api/src/main/java/com/google/errorprone/fixes/SuggestedFixes.java

@@ -80,6 +80,7 @@
 import com.sun.tools.javac.util.Options;
 import com.sun.tools.javac.util.Position;
 import java.io.IOException;
+import java.nio.file.Paths;
 import java.util.ArrayDeque;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -642,7 +643,7 @@ public static boolean compilesWithFix(Fix fix, VisitorState state) {
         try {
           fixSource =
               new SourceFile(
-                  modifiedFile.getName(),
+                  Paths.get(modifiedFile.toUri()),
                   modifiedFile.getCharContent(false /*ignoreEncodingErrors*/));
         } catch (IOException e) {
           return false;

check_api/src/test/java/com/google/errorprone/apply/SourceFileTest.java

@@ -18,6 +18,8 @@
 
 import static org.junit.Assert.assertEquals;
 
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.Arrays;
 import java.util.List;
 import org.junit.Before;
@@ -33,7 +35,7 @@
 @RunWith(JUnit4.class)
 public class SourceFileTest {
 
-  private static final String DUMMY_PATH = "java/com/google/foo/bar/FooBar.java";
+  private static final Path DUMMY_PATH = Paths.get("java/com/google/foo/bar/FooBar.java");
   private static final String SOURCE_TEXT =
       "// Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do\n"
           + "// eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut\n"

core/src/test/java/com/google/errorprone/refaster/CompilerBasedTest.java

@@ -21,23 +21,32 @@
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.io.CharStreams;
+import com.google.common.io.Resources;
+import com.google.common.jimfs.Jimfs;
 import com.google.errorprone.apply.SourceFile;
 import com.google.testing.compile.JavaFileObjects;
 import com.sun.source.tree.CompilationUnitTree;
 import com.sun.tools.javac.api.JavacTaskImpl;
 import com.sun.tools.javac.api.JavacTool;
+import com.sun.tools.javac.file.JavacFileManager;
 import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
 import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
 import com.sun.tools.javac.tree.TreeInfo;
 import com.sun.tools.javac.tree.TreeScanner;
 import com.sun.tools.javac.util.Context;
+import java.io.IOError;
 import java.io.IOException;
+import java.nio.file.FileSystem;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Arrays;
 import java.util.Locale;
 import java.util.Map;
 import javax.tools.DiagnosticCollector;
 import javax.tools.JavaCompiler;
 import javax.tools.JavaFileObject;
 import javax.tools.StandardJavaFileManager;
+import org.junit.After;
 
 /**
  * Abstract skeleton for tests that run the compiler on the fly.
@@ -49,6 +58,8 @@ public class CompilerBasedTest {
   protected SourceFile sourceFile;
   protected Iterable<JCCompilationUnit> compilationUnits;
   private Map<String, JCMethodDecl> methods;
+  private final JavacFileManager fileManager = new JavacFileManager(new Context(), false, UTF_8);
+  private final FileSystem fileSystem = Jimfs.newFileSystem();
 
   protected void compile(TreeScanner scanner, JavaFileObject fileObject) {
     JavaCompiler compiler = JavacTool.create();
@@ -107,10 +118,37 @@ public void visitTopLevel(JCCompilationUnit tree) {
   }
 
   protected void compile(String... lines) {
-    compile(JavaFileObjects.forSourceLines("CompilerBasedTestInput", lines));
+    try {
+      Path dir = fileSystem.getRootDirectories().iterator().next().resolve("tmp");
+      Files.createDirectories(dir);
+      Path path = Files.createTempFile(dir, "CompilerBasedTestInput", ".java");
+      Files.write(path, Arrays.asList(lines), UTF_8);
+      compile(fileManager.getJavaFileObject(path));
+    } catch (IOException e) {
+      throw new IOError(e);
+    }
+  }
+
+  JavaFileObject forResource(String name) {
+    try {
+      Path dir = fileSystem.getRootDirectories().iterator().next().resolve("tmp");
+      Files.createDirectories(dir);
+      Path path = Files.createTempDirectory(dir, "tmp").resolve(name);
+      Files.createDirectories(path.getParent());
+      Files.write(path, Resources.toByteArray(Resources.getResource(name)));
+      return fileManager.getJavaFileObject(path);
+    } catch (IOException e) {
+      throw new IOError(e);
+    }
   }
 
   protected JCMethodDecl getMethodDeclaration(String name) {
     return methods.get(name);
   }
+
+  @After
+  public void close() throws IOException {
+    fileSystem.close();
+    fileManager.close();
+  }
 }