Add support for generating jars from protos and add cacheinvalidation_java.

build/protoc_java.gypi

+# Copyright (c) 2012 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.
+
+# This file is meant to be included into a target to provide a rule
+# to invoke protoc in a consistent manner.
+#
+# To use this, create a gyp target with the following form:
+# {
+#   'target_name': 'my_proto_lib',
+#   'type': 'static_library',
+#   'sources': [
+#     'foo.proto',
+#     'bar.proto',
+#   ],
+#   'variables': {
+#     'proto_in_dir': '.'
+#     'proto_out_dir': 'dir/for/my_proto_lib'
+#     'output_java_files': [
+#       'org/chromium/package/Foo.java',
+#       'org/chromium/package/Bar.java'
+#     ],
+#   },
+#   'includes': ['path/to/this/gypi/file'],
+# }
+#
+# The 'proto_in_dir' variable must be the relative path to the
+# directory containing the .proto files.  If left out, it defaults to '.'.
+#
+# The 'proto_out_dir' variable specifies the path suffix that output
+# files are generated under.
+#
+# The 'output_java_files' variable specifies a list of output files that will

[cjhopman, 2012/10/15 22:14:24]

Maybe mention here how the output files should be prefixed by >(java_dir).

+# be generated. It is based on the package and java_outer_classname fields in
+# the proto.
+#
+# Implementation notes:
+# A 'proto_out_dir' of foo/bar and proto-specified 'package' java.package.path
+# produces:
+#   <(PRODUCT_DIR)/javaproto/foo/bar/{java/package/path/}{Foo,Bar}.java
+# where Foo and Bar are taken from 'java_outer_classname' of the protos.
+
+{
+  'variables': {
+    'protoc': '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)protoc<(EXECUTABLE_SUFFIX)',
+    'java_dir': '<(PRODUCT_DIR)/javaproto/<(proto_out_dir)',
+    'proto_in_dir%': '.',
+  },
+  'actions': [
+    {
+      'action_name': 'genproto_java_output_dirs',
+      'inputs' : [],
+      'outputs': [
+        '<(java_dir)'
+      ],
+      'action': [ 'mkdir', '-p', '<(java_dir)' ],
+    },
+    {
+      'action_name': 'genproto_java',
+      'inputs': [
+        '<(protoc)',
+        '<@(_sources)',
+      ],
+      'outputs': [
+        '<@(output_java_files)',
+      ],
+      'action': [
+        '<(protoc)',
+        '--proto_path','<(proto_in_dir)',
+        '<@(_sources)',
+        '--java_out', '<(java_dir)',
+      ],
+      'message': 'Generating Java code from <(RULE_INPUT_PATH)',

[cjhopman, 2012/10/15 22:14:24]

Update this message to use something other than RULE_INPUT_PATH.

[cjhopman, 2012/10/15 22:15:10]

Done.

+    },
+  ],
+  'dependencies': [
+    '<(DEPTH)/third_party/protobuf/protobuf.gyp:protoc#host',
+    '<(DEPTH)/third_party/protobuf/protobuf.gyp:protobuf_lite',
+  ],
+  'include_dirs': [
+    '<(SHARED_INTERMEDIATE_DIR)/protoc_out',
+    '<(DEPTH)',
+  ],
+  'direct_dependent_settings': {
+    'variables': {
+      'generated_src_dirs': ['<(java_dir)'],
+      'additional_input_paths': ['<@(_sources)'],
+    },
+  },
+}