[Android] Create and use .TOC files for jars

build/android/gyp/javac.py

 #!/usr/bin/env python
 #
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import fnmatch
 import optparse
 import os
 import sys
 
 from util import build_utils
+from util import md5_check
 
 
 def DoJavac(options):
   output_dir = options.output_dir
 
   src_dirs = build_utils.ParseGypList(options.src_dirs)
   java_files = build_utils.FindInDirectories(src_dirs, '*.java')
   if options.javac_includes:
     javac_includes = build_utils.ParseGypList(options.javac_includes)
     filtered_java_files = []
     for f in java_files:
       for include in javac_includes:
         if fnmatch.fnmatch(f, include):
           filtered_java_files.append(f)
           break
     java_files = filtered_java_files
 
   # Compiling guava with certain orderings of input files causes a compiler
   # crash... Sorted order works, so use that.
   # See https://code.google.com/p/guava-libraries/issues/detail?id=950
   java_files.sort()
-
   classpath = build_utils.ParseGypList(options.classpath)
 
-  # Delete the classes directory. This ensures that all .class files in the
-  # output are actually from the input .java files. For example, if a .java
-  # file is deleted or an inner class is removed, the classes directory should
-  # not contain the corresponding old .class file after running this action.
-  build_utils.DeleteDirectory(output_dir)
-  build_utils.MakeDirectory(output_dir)
+  jar_inputs = []
+  for path in classpath:
+    if os.path.exists(path + '.TOC'):
+      jar_inputs.append(path + '.TOC')
+    else:
+      jar_inputs.append(path)
 
-  cmd = [
+  javac_cmd = [
       'javac',
       '-g',
       '-source', '1.5',
       '-target', '1.5',
       '-classpath', ':'.join(classpath),
       '-d', output_dir,
       '-Xlint:unchecked',
       '-Xlint:deprecation',
-      ]
+      ] + java_files
 
-  suppress_output = not options.chromium_code
-  build_utils.CheckCallDie(cmd + java_files, suppress_output=suppress_output)
+  md5_stamp = '%s/javac.md5' % options.output_dir
+  md5_checker = md5_check.Md5Checker(
+      stamp=md5_stamp,
+      inputs=java_files + jar_inputs,
+      command=javac_cmd)
+  if md5_checker.IsStale():
+    # Delete the classes directory. This ensures that all .class files in the
+    # output are actually from the input .java files. For example, if a .java
+    # file is deleted or an inner class is removed, the classes directory should
+    # not contain the corresponding old .class file after running this action.
+    build_utils.DeleteDirectory(output_dir)
+    build_utils.MakeDirectory(output_dir)
+    suppress_output = not options.chromium_code
+    build_utils.CheckCallDie(javac_cmd, suppress_output=suppress_output)
+    md5_checker.Write()
 
 def main(argv):
   parser = optparse.OptionParser()
   parser.add_option('--src-dirs', help='Directories containing java files.')
   parser.add_option('--javac-includes',
       help='A list of file patterns. If provided, only java files that match' +
         'one of the patterns will be compiled.')
   parser.add_option('--classpath', help='Classpath for javac.')
   parser.add_option('--output-dir', help='Directory for javac output.')
   parser.add_option('--stamp', help='Path to touch on success.')
   parser.add_option('--chromium-code', type='int', help='Whether code being '
                     'compiled should be built with stricter warnings for '
                     'chromium code.')
 
   # TODO(newt): remove this once http://crbug.com/177552 is fixed in ninja.
   parser.add_option('--ignore', help='Ignored.')
 
   options, _ = parser.parse_args()
 
   DoJavac(options)
 
   if options.stamp:
     build_utils.Touch(options.stamp)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))