Fork from http://code.google.com/p/protobuf-java-format/

Description

Provide serialization and de-serialization of different formats based on Google’s protobuf Message. Enables overriding the default (byte array) output to text based formats such as XML, JSON and HTML.

##Example For XML output, use XmlFormat

Message someProto = SomeProto.getDefaultInstance();
XmlFormat xmlFormat = new XmlFormat();
String asXml = xmlFormat.printToString(someProto);

For XML input, use XmlFormat

Message.Builder builder = SomeProto.newBuilder();
String asXml = _load xml document from a source_;
XmlFormat xmlFormat = new XmlFormat();
xmlFormat.merge(asXml, builder);

For Json output, use JsonFormat

Message someProto = SomeProto.getDefaultInstance();
JsonFormat jsonFormat = new JsonFormat();
String asJson = jsonFormat.printToString(someProto);

For Json input, use JsonFormat

Message.Builder builder = SomeProto.newBuilder();
String asJson = _load json document from a source_;
JsonFormat jsonFormat = new JsonFormat();
jsonFormat.merge(asJson, builder);

For HTML output, use HtmlFormat

Message someProto = SomeProto.getDefaultInstance();
HtmlFormat htmlFormat = new HtmlFormat();
String asHtml = htmlFormat.printToString(someProto);