1 /* 2 * ==================================================================== 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * ==================================================================== 20 * 21 * This software consists of voluntary contributions made by many 22 * individuals on behalf of the Apache Software Foundation. For more 23 * information on the Apache Software Foundation, please see 24 * <http://www.apache.org/>. 25 * 26 */ 27 28 package org.apache.hc.core5.http.io.entity; 29 30 import java.io.InputStream; 31 32 /** 33 * @since 5.1 34 */ 35 public final class EmptyInputStream extends InputStream { 36 37 public static final EmptyInputStreamity/EmptyInputStream.html#EmptyInputStream">EmptyInputStream INSTANCE = new EmptyInputStream(); 38 39 private EmptyInputStream() { 40 // noop. 41 } 42 43 /** 44 * Returns {@code 0}. 45 */ 46 @Override 47 public int available() { 48 return 0; 49 } 50 51 /** 52 * Noop. 53 */ 54 @Override 55 public void close() { 56 // noop. 57 } 58 59 /** 60 * Noop. 61 */ 62 @SuppressWarnings("sync-override") 63 @Override 64 public void mark(final int readLimit) { 65 // noop. 66 } 67 68 /** 69 * Returns {@code true}. 70 */ 71 @Override 72 public boolean markSupported() { 73 return true; 74 } 75 76 /** 77 * Returns {@code -1}. 78 */ 79 @Override 80 public int read() { 81 return -1; 82 } 83 84 /** 85 * Returns {@code -1}. 86 */ 87 @Override 88 public int read(final byte[] buf) { 89 return -1; 90 } 91 92 /** 93 * Returns {@code -1}. 94 */ 95 @Override 96 public int read(final byte[] buf, final int off, final int len) { 97 return -1; 98 } 99 100 /** 101 * Noop. 102 */ 103 @SuppressWarnings("sync-override") 104 @Override 105 public void reset() { 106 // noop 107 } 108 109 /** 110 * Returns {@code 0}. 111 */ 112 @Override 113 public long skip(final long n) { 114 return 0L; 115 } 116 } 117