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/*
 * Copyright 2011 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.codegen.server;

import java.io.PrintWriter;

/**
 * Wrapper for a {@link PrintWriter} that adds the ability to abort creation
 * and an onClose hook
 * 

* Experimental API - subject to change. */ public class AbortablePrintWriter extends PrintWriter { private boolean isClosed = false; /** * Wrap a {@link PrintWriter} instance. * * @param pw * @throws RuntimeException if there are reflection errors accessing the out * field in pw */ public AbortablePrintWriter(PrintWriter pw) { super(pw); } /** * Abort creation of this output. */ public void abort() { if (!isClosed) { flush(); super.close(); isClosed = true; onClose(true); } } @Override public void close() { if (!isClosed) { flush(); super.close(); isClosed = true; onClose(false); } } /** * Called exactly once when this {@link PrintWriter} is closed or aborted. * * @param aborted */ protected void onClose(boolean aborted) { // Do nothing by default. } }





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