1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.commons.io.output; 19 20 import java.io.IOException; 21 22 /** 23 * Appends all data to the famous <b>/dev/null</b>. 24 * <p> 25 * This Appendable has no destination (file/socket etc.) and all characters written to it are ignored and lost. 26 * </p> 27 * 28 * @since 2.8.0 29 */ 30 public class NullAppendable implements Appendable { // NOPMD Class will be final in 3.0. 31 32 /** 33 * A singleton. 34 */ 35 public static final NullAppendable INSTANCE = new NullAppendable(); 36 37 /** Use the singleton. */ 38 private NullAppendable() { 39 // no instances. 40 } 41 42 @Override 43 public Appendable append(final char c) throws IOException { 44 return this; 45 } 46 47 @Override 48 public Appendable append(final CharSequence csq) throws IOException { 49 return this; 50 } 51 52 @Override 53 public Appendable append(final CharSequence csq, final int start, final int end) throws IOException { 54 return this; 55 } 56 57 }