AST:
  public static CompilationUnit parseCompilationUnit(char[] source, String unitName, IJavaProject javaProject, boolean resolveBindings) {
        
    CompilationUnitDeclaration compilationUnitDeclaration = null;

    if (resolveBindings) {
      // If resolveBindings is true, we need to record the mod count
      // once newAST has been constructed. If the mod count goes above
      // this level, someone is modifying the AST and all bets are off
      // regarding resolved bindings. All existing binding info should be
      // discarded, and the various public resolveBinding methods should
      // thereafter return null.
      try {
        compilationUnitDeclaration = CompilationUnitResolver.resolve(
          source, unitName, javaProject,
          new AbstractSyntaxTreeVisitorAdapter());
        if (compilationUnitDeclaration != null && source != null) {
          ASTConverter converter = new ASTConverter(true);
          AST ast = new AST();
          ast.setBindingResolver(new DefaultBindingResolver(compilationUnitDeclaration.scope));
          converter.setAST(ast);
          CompilationUnit cu = converter.convert(compilationUnitDeclaration, source);
          // line end table should be extracted from scanner
          cu.setLineEndTable(compilationUnitDeclaration.compilationResult.lineSeparatorPositions);
        
          // line end table should be extracted from scanner
          //cu.setLineEndTable(parser.scanner.lineEnds);
          return cu;
        } else {
          return null;
        }
      } catch(JavaModelException e) {
      }
    } else {
      return parseCompilationUnit(source);
    }
    return null;
  }


CompilationUnitResolver:
  protected static INameEnvironment getNameEnvironment(IJavaProject javaProject)
    throws JavaModelException {
    return (SearchableEnvironment) ((JavaProject)javaProject).getSearchableNameEnvironment();
  }
  
  public static CompilationUnitDeclaration resolve(
    char[] source, String unitName, IJavaProject javaProject,
    IAbstractSyntaxTreeVisitor visitor)
    throws JavaModelException {

    CompilationUnitResolver compilationUnitVisitor =
      new CompilationUnitResolver(
        getNameEnvironment(javaProject),
        getHandlingPolicy(),
        JavaCore.getOptions(),
        getRequestor(),
        getProblemFactory(visitor));

    CompilationUnitDeclaration unit = null;
    try {
      String encoding = (String) JavaCore.getOptions().get(CompilerOptions.OPTION_Encoding);
      if ("".equals(encoding)) encoding = null; //$NON-NLS-1$
      
      unit =
        compilationUnitVisitor.resolve(
          new BasicCompilationUnit(
            source,
            unitName,
            encoding));
      return unit;
    } finally {
      if (unit != null) {
        unit.cleanUp();
      }
    }
  }