    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
    018package org.apache.commons.io.output;
    019
    020import java.io.PrintStream;
    021
    022/**
    023 * Never prints data. Calls never go beyond this class.
    024 * <p>
    025 * This print stream has no destination (file/socket etc.) and all bytes written to it are ignored and lost.
    026 * </p>
    027 *
    028 * @since 2.7
    029 */
    030public class NullPrintStream extends PrintStream {
    031
    032    /**
    033     * The singleton instance.
    034     *
    035     * @since 2.12.0
    036     */
    037    public static final NullPrintStream INSTANCE = new NullPrintStream();
    038
    039    /**
    040     * The singleton instance.
    041     *
    042     * @deprecated Use {@link #INSTANCE}.
    043     */
    044    @Deprecated
    045    public static final NullPrintStream NULL_PRINT_STREAM = INSTANCE;
    046
    047    /**
    048     * Constructs an instance.
    049     *
    050     * @deprecated Use {@link #INSTANCE}.
    051     */
    052    @Deprecated
    053    public NullPrintStream() {
    054        // Relies on the default charset which is OK since we are not actually writing.
    055        super(NullOutputStream.INSTANCE);
    056    }
    057
    058}