Add script to change java version

The script is quite basic.  It does not even take parameters.
However, considering it will be run probably once every three
years, I felt it was sufficient.

Change-Id: Ic2b533758529f393d6e37c010f0a5cb666e84b53

releng/scripts/ChangeJavaVersion.sh

@@ -0,0 +1,79 @@
+#!/bin/sh
+
+# This script was used to update most of CDT's plugins from
+# java 7 to java 8.
+# The script recursively updated all plugins starting
+# at $root_dir from java version $old_ver to $new_ver
+# for changes required to go from java 7 to java 8.
+#
+# To re-use this script in the future for a new version of java,
+# please make sure its behaviour mimics Eclipse behavior of
+# "Update the classpath settings" in the Overview tab of manifest
+# file editor.
+
+old_ver=1\\.7 # Need to escape the . to avoid it matching any character
+new_ver=1.8
+java_name=JavaSE
+
+root_dir=.
+
+classpath_file=.classpath
+manifest_file=MANIFEST.MF
+jdt_pref_file=org.eclipse.jdt.core.prefs
+jdt_pref1=org.eclipse.jdt.core.compiler.codegen.targetPlatform
+jdt_pref2=org.eclipse.jdt.core.compiler.compliance
+jdt_pref3=org.eclipse.jdt.core.compiler.source
+
+fix_classpath_file()
+{
+    find $root_dir -type f -name ${classpath_file} \
+        -exec sed -i s,${java_name}-${old_ver},${java_name}-${new_ver}, '{}' \;
+}
+
+fix_manifest_file()
+{
+    find $root_dir -type f -name ${manifest_file} \
+        -exec sed -i s,${java_name}-${old_ver},${java_name}-${new_ver}, '{}' \;
+}
+
+fix_jdt_prefs_file()
+{
+    find $root_dir -type f -name ${jdt_pref_file} \
+        -exec sed -i s,${jdt_pref1}=$old_ver,${jdt_pref1}=$new_ver, '{}' \;
+    find $root_dir -type f -name ${jdt_pref_file} \
+        -exec sed -i s,${jdt_pref2}=$old_ver,${jdt_pref2}=$new_ver, '{}' \;
+    find $root_dir -type f -name ${jdt_pref_file} \
+        -exec sed -i s,${jdt_pref3}=$old_ver,${jdt_pref3}=$new_ver, '{}' \;
+}
+
+launch_file=StandaloneTests.launch
+fix_standalone_debugger_test_launch()
+{
+    find $root_dir -type f -name ${launch_file} \
+        -exec sed -i s,${java_name}-${old_ver},${java_name}-${new_ver}, '{}' \;
+}
+
+pom_file=pom.xml
+fix_pom()
+{
+    find $root_dir -type f -name ${pom_file} \
+        -exec sed -i s,sonar.java.source\>${old_ver},sonar.java.source\>${new_ver}, '{}' \;
+    find $root_dir -type f -name ${pom_file} \
+        -exec sed -i s,targetJdk\>${old_ver},targetJdk\>${new_ver}, '{}' \;
+}
+
+old_ver_remaining_log=/tmp/remaingOldStrings.log
+grep_for_remaining_old_version_string()
+{
+    echo "Please CHECK the file\n   ${old_ver_remaining_log}\nfor any remaining instances"\
+         "of ${old_ver} below directory:\n   $root_dir\nto make sure they were not forgotten."
+    grep -r ${old_ver} ${root_dir} | grep -v "/target/" | grep -v "Binary file" | grep -vF .log | grep -v "Generated by javadoc" > ${old_ver_remaining_log}
+    echo "Please also CHECK that all changes made are correct before committing"
+}
+
+fix_classpath_file
+fix_manifest_file
+fix_jdt_prefs_file
+fix_standalone_debugger_test_launch
+fix_pom
+grep_for_remaining_old_version_string