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.IOException;
021
022/**
023 * Appends all data to the famous <b>/dev/null</b>.
024 * <p>
025 * This Appendable has no destination (file/socket etc.) and all characters written to it are ignored and lost.
026 * </p>
027 *
028 * @since 2.8.0
029 */
030public class NullAppendable implements Appendable {
031
032    /**
033     * A singleton.
034     */
035    public static final NullAppendable INSTANCE = new NullAppendable();
036
037    /** Use the singleton. */
038    private NullAppendable() {
039        // no instances.
040    }
041
042    @Override
043    public Appendable append(final char c) throws IOException {
044        return this;
045    }
046
047    @Override
048    public Appendable append(final CharSequence csq) throws IOException {
049        return this;
050    }
051
052    @Override
053    public Appendable append(final CharSequence csq, final int start, final int end) throws IOException {
054        return this;
055    }
056
057}