first java version, ported from kotlin

.gitignore

@@ -0,0 +1,18 @@
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+# Gradle
+/.gradle
+
+# Idea
+/.idea
+/build
+
+# misc
+.DS_Store

README.md

@@ -1,2 +1,82 @@
 # ipp-printjob-java
-A minimal ipp protocol implementation to submit a document to a printer
+A minimal ipp protocol implementation to submit a document to a printer.
+
+### General
+
+The printjob source code should be useful for use cases of driverless printing.
+Especially automated processes without user interaction should benefit from simple solutions like this.
+This code is not and will never become a full-fledged ipp implementation.
+I will provide more control over print jobs, monitoring of printers and print jobs in my other project
+[ipp-client-kotlin](https://github.com/gmuth/ipp-client-kotlin).
+
+### Distribution
+
+For the impatient [binary releases](https://github.com/gmuth/ipp-printjob-java/releases) are provided. 
+Directory `demo` also contains the `printjob.jar` and a test script called `go` that submits a blank PDF to Apple's Printer Simulator.
+To avoid real printing, registered Apple developers can download
+[Additional Tools for Xcode](https://download.developer.apple.com/Developer_Tools/Additional_Tools_for_Xcode_11/Additional_Tools_for_Xcode_11.dmg)
+containing the Printer Simulator.
+
+### Usage
+
+The tool takes two arguments: *printer-uri* and *file-name*. 
+The url scheme `ipp://` is not supported - use `http://` instead.
+If you don't know the printer uri try `ippfind`. 
+
+    java -jar printjob.jar http://colorjet:631/ipp/printer A4-blank.pdf
+
+    send ipp request to http://colorjet:631/ipp/printer
+    ipp version 1.1
+    ipp response status: 0000
+    group 01
+       attributes-charset (47) = utf-8
+       attributes-natural-language (48) = en
+    group 02
+       job-uri (45) = ipp://colorjet:631/jobs/352
+       job-id (21) = 352
+       job-state (23) = 3
+       job-state-reasons (44) = none
+    group 03
+
+The equivalent java code is:
+
+    new PrintJob().printDocument(
+        URI.create("http://colorjet:631/ipp/printer"),
+        FileInputStream(File("A4-blank.pdf"))
+    )
+
+### Document Format
+
+The operation attributes group does not include a value for `document-format` by default.
+This should be equivalent to `application/octet-stream` indicating the printer has to auto sense the document format.
+You have to make sure the printer supports the document format you send - PDF is usually a good option.
+If required by your printer, you can set the document format programmatically by adding it e.g. after the `printer-uri` attribute.
+
+    writeAttribute(dataOutputStream, 0x49, "document-format", "application/pdf");
+
+### Issues
+
+If you use an unsupported `printer-uri` you will get a response similar to this one:
+
+    send ipp request to http://localhost:8632/ipp/norona
+    ipp version 1.1
+    ipp status 0400
+    group 01
+       attributes-charset (47) = utf-8
+       attributes-natural-language (48) = en
+       status-message (41) = Bad printer-uri "http://localhost:8632/ipp/norona".
+    group 03
+
+You can use `ippfind` or `dns-sd -Z _ipp._tcp` (look at the rp value) to discover your printer's uri.
+If you have other issues contact me.
+
+### Build
+
+To build `printjob.jar` into `build/libs` you need an installed JDK.
+
+    ./gradlew
+
+### Community
+
+I'd be happy to see this minimal ipp implementation being ported to all kinds of programming languages.
+On request I'll explain developers without experience in jvm based languages what the jvm runtime library is used for.

build.gradle

@@ -0,0 +1,21 @@
+plugins {
+    id 'java-library'
+}
+
+repositories {
+    jcenter()
+}
+
+defaultTasks("clean", "build")
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_1_9
+    targetCompatibility = JavaVersion.VERSION_1_9
+}
+
+jar {
+    manifest {
+        attributes 'Main-Class': 'ipp.PrintJob'
+    }
+    archivesBaseName = 'printjob'
+}

demo/go

@@ -0,0 +1 @@
+java -jar printjob.jar http://localhost:8632/printers/laser A4-blank.pdf

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Fri Mar 20 18:18:46 CET 2020
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-all.zip
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStorePath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME

gradlew

@@ -0,0 +1,183 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"