    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 659817 2008-05-24 13:23:10Z 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        @Override
    045        public void write(byte[] b, int off, int len) {
    046            //to /dev/null
    047        }
    048
    049        /**
    050         * Does nothing - output to <code>/dev/null</code>.
    051         * @param b The byte to write
    052         */
    053        @Override
    054        public void write(int b) {
    055            //to /dev/null
    056        }
    057
    058        /**
    059         * Does nothing - output to <code>/dev/null</code>.
    060         * @param b The bytes to write
    061         * @throws IOException never
    062         */
    063        @Override
    064        public void write(byte[] b) throws IOException {
    065            //to /dev/null
    066        }
    067
    068    }