001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     * 
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     * 
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.commons.io.output;
018     
019    import java.io.IOException;
020    import java.io.OutputStream;
021    
022    /**
023     * This OutputStream writes all data to the famous <b>/dev/null</b>.
024     * <p>
025     * This output stream has no destination (file/socket etc.) and all
026     * bytes written to it are ignored and lost.
027     * 
028     * @author Jeremias Maerki
029     * @version $Id: NullOutputStream.java 610010 2008-01-08 14:50:59Z niallp $
030     */
031    public class NullOutputStream extends OutputStream {
032        
033        /**
034         * A singleton.
035         */
036        public static final NullOutputStream NULL_OUTPUT_STREAM = new NullOutputStream();
037    
038        /**
039         * Does nothing - output to <code>/dev/null</code>.
040         * @param b The bytes to write
041         * @param off The start offset
042         * @param len The number of bytes to write
043         */
044        public void write(byte[] b, int off, int len) {
045            //to /dev/null
046        }
047    
048        /**
049         * Does nothing - output to <code>/dev/null</code>.
050         * @param b The byte to write
051         */
052        public void write(int b) {
053            //to /dev/null
054        }
055    
056        /**
057         * Does nothing - output to <code>/dev/null</code>.
058         * @param b The bytes to write
059         * @throws IOException never
060         */
061        public void write(byte[] b) throws IOException {
062            //to /dev/null
063        }
064    
065    }