Reviewers: kenton,
Description:
In C++, writing a code generator plugin is as easy as implementing
CodeGenerator and passing an instance to
google::protobuf::compiler::PluginMain; it shouldn't be any harder in
Java (or Python BTW).
This patch adds a JavaHelpers class which is just a port of
google/protobuf/compiler/java/java_helpers.{h,cc} with a few additional
helper methods; and the abstract Plugin class.
To implement a protoc plugin in Java, simply write an implementation of
Plugin, then create a main() method like:
public static void main(String[] args) {
new MyPlugin().run(args);
}
The main difference with C++ is that the Java code needs to be launched
from a shell/batch script (the patch includes a sample batch file for
Windows), and expects that the name of the script be passed as the first
command-line argument.
The code currently lacks JavaDoc and unit tests but I'm providing it
here for an early review.
Please review this at http://codereview.appspot.com/912042/show
Affected files:
java/protoc-gen-plugin.bat.tmpl
java/src/main/java/com/google/protobuf/compiler/JavaHelpers.java
java/src/main/java/com/google/protobuf/compiler/Plugin.java
src/google/protobuf/compiler/plugin.proto
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