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Commons IO example source code file (YellOnFlushAndCloseOutputStream.java)

This example Commons IO source code file (YellOnFlushAndCloseOutputStream.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons IO tags/keywords

assertionfailederror, io, ioexception, ioexception, outputstream, outputstream, override, override, proxyoutputstream, yellonflushandcloseoutputstream, yellonflushandcloseoutputstream

The Commons IO YellOnFlushAndCloseOutputStream.java source code

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.commons.io.testtools;

import java.io.IOException;
import java.io.OutputStream;

import junit.framework.AssertionFailedError;

import org.apache.commons.io.output.ProxyOutputStream;

 * Helper class for checking behaviour of IO classes.
 * @author <a href="mailto:jeremias@apache.org">Jeremias Maerki
public class YellOnFlushAndCloseOutputStream extends ProxyOutputStream {

    private boolean yellForFlush;
    private boolean yellForClose;

     * @param proxy OutputStream to delegate to.
     * @param yellForFlush True if flush() is forbidden
     * @param yellForClose True if close() is forbidden
    public YellOnFlushAndCloseOutputStream(OutputStream proxy, boolean yellForFlush, boolean yellForClose) {
        this.yellForFlush = yellForFlush;
        this.yellForClose = yellForClose;

    /** @see java.io.OutputStream#flush() */
    public void flush() throws IOException {
        if (yellForFlush) {
            throw new AssertionFailedError("flush() was called on OutputStream");

    /** @see java.io.OutputStream#close() */
    public void close() throws IOException {
        if (yellForClose) {
            throw new AssertionFailedError("close() was called on OutputStream");

    public void off() {
        yellForFlush = false;
        yellForClose = false;


Other Commons IO examples (source code examples)

Here is a short list of links related to this Commons IO YellOnFlushAndCloseOutputStream.java source code file:

my book on functional programming


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