CodeGenerator

  /**
     * Returns reference to ICompilationUnit object within the given project name and java file name.
     *
     * @param projectName
     *            Name of project created in Eclipse workspace.
     * @param fileName
     *            packageName.JavaFileNameWithoutDotJava
     *
     * @return Instance of ICompilationUnit.
     */
    public ICompilationUnit getCompilationUnit(final String projectName, final String fileName)  throws Exception {
        final IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
        final IProject project = root.getProject(projectName);
        IJavaProject javaProject = JavaCore.create(project); 
        IType lwType = javaProject.findType(fileName);
        
        return lwType.getCompilationUnit(); 
    }
	
    public CompilationUnit parse(ICompilationUnit unit) {
        ASTParser parser = ASTParser.newParser(AST.JLS3); 
        parser.setKind(ASTParser.K_COMPILATION_UNIT);
        parser.setSource(unit); // set source
        parser.setResolveBindings(true); // we need bindings later on
        return (CompilationUnit) parser.createAST(null /* IProgressMonitor */); // parse
    }