| /* |
| * Copyright 2008 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.uibinder.elementparsers; |
| |
| import com.google.gwt.core.ext.UnableToCompleteException; |
| import com.google.gwt.uibinder.rebind.XMLElement; |
| import com.google.gwt.uibinder.rebind.XMLElement.Interpreter; |
| import com.google.gwt.uibinder.rebind.XMLElement.PostProcessingInterpreter; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Pairs {@link XMLElement.Interpreter} instances. |
| * |
| * @param <T> The type returned by all members of the pipe |
| */ |
| class InterpreterPipe<T> implements PostProcessingInterpreter<T> { |
| public static <T>InterpreterPipe<T> newPipe(Interpreter<T>... pipes) { |
| InterpreterPipe<T> rtn = new InterpreterPipe<T>(); |
| for (int i = 0; i < pipes.length; ++i) { |
| rtn.add(pipes[i]); |
| } |
| return rtn; |
| } |
| |
| private final List<Interpreter<T>> pipe = |
| new ArrayList<Interpreter<T>>(); |
| |
| public void add(Interpreter<T> i) { |
| pipe.add(i); |
| } |
| |
| /** |
| * Interpreters are fired in the order they were handed to the constructor. If |
| * an interpreter gives a non-null result, downstream interpreters don't |
| * fire. |
| * |
| * @return The T or null returned by the last pipelined interpreter to run |
| * @throws UnableToCompleteException on error |
| */ |
| public T interpretElement(XMLElement elem) throws UnableToCompleteException { |
| T rtn = null; |
| for (XMLElement.Interpreter<T> i : pipe) { |
| rtn = i.interpretElement(elem); |
| if (null != rtn) { |
| break; |
| } |
| } |
| return rtn; |
| } |
| |
| /** |
| * Called by various {@link XMLElement} consumeInner*() methods after all |
| * elements have been handed to {@link #interpretElement}. Passes the |
| * text to be post processed to each pipe member that is instanceof |
| * {@link PostProcessingInterpreter}. |
| */ |
| public String postProcess(String consumedText) throws UnableToCompleteException { |
| for (XMLElement.Interpreter<T> i : pipe) { |
| if (i instanceof PostProcessingInterpreter<?>) { |
| consumedText = ((PostProcessingInterpreter<T>) i).postProcess(consumedText); |
| } |
| } |
| return consumedText; |
| } |
| } |