@Override
public ProductMessage onVersionMessage(List<Message> messages) throws ParseException {
VersionMessage version = Messages.getVersionMessage(messages);
if (!version.getLanguage().equals(JAVA)) {
throw new IllegalArgumentException("wrong language in version message");
}
ProductMessage ast = Messages.getProductMessage(messages, AST, JAVA);
if (!ast.getLanguage().equals(JAVA)) {
throw new IllegalArgumentException("wrong language in ast product message");
}
NonTerminal root = (NonTerminal) ASTs.decode(ast);
OutlineTrimmer trimmer = new OutlineTrimmer();
root.accept(trimmer);
return new ProductMessage(
version.getVersionId(),
new LongKey(1),
version.getSource(),
OUTLINE,
JAVA,
Outlines.encode(trimmer.getConverted()),
new ProductDependency(ast));
}