001/* 002 * ==================================================================== 003 * Licensed to the Apache Software Foundation (ASF) under one 004 * or more contributor license agreements. See the NOTICE file 005 * distributed with this work for additional information 006 * regarding copyright ownership. The ASF licenses this file 007 * to you under the Apache License, Version 2.0 (the 008 * "License"); you may not use this file except in compliance 009 * with the License. You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, 014 * software distributed under the License is distributed on an 015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 016 * KIND, either express or implied. See the License for the 017 * specific language governing permissions and limitations 018 * under the License. 019 * ==================================================================== 020 * 021 * This software consists of voluntary contributions made by many 022 * individuals on behalf of the Apache Software Foundation. For more 023 * information on the Apache Software Foundation, please see 024 * <http://www.apache.org/>. 025 * 026 */ 027 028package org.apache.http.impl.io; 029 030import java.io.IOException; 031import java.io.InputStream; 032 033import org.apache.http.io.BufferInfo; 034import org.apache.http.io.SessionInputBuffer; 035import org.apache.http.util.Args; 036 037/** 038 * Input stream that reads data without any transformation. The end of the 039 * content entity is demarcated by closing the underlying connection 040 * (EOF condition). Entities transferred using this input stream can be of 041 * unlimited length. 042 * <p> 043 * Note that this class NEVER closes the underlying stream, even when close 044 * gets called. Instead, it will read until the end of the stream (until 045 * {@code -1} is returned). 046 * 047 * @since 4.0 048 */ 049public class IdentityInputStream extends InputStream { 050 051 private final SessionInputBuffer in; 052 053 private boolean closed = false; 054 055 /** 056 * Wraps session input stream and reads input until the the end of stream. 057 * 058 * @param in The session input buffer 059 */ 060 public IdentityInputStream(final SessionInputBuffer in) { 061 super(); 062 this.in = Args.notNull(in, "Session input buffer"); 063 } 064 065 @Override 066 public int available() throws IOException { 067 if (this.in instanceof BufferInfo) { 068 return ((BufferInfo) this.in).length(); 069 } else { 070 return 0; 071 } 072 } 073 074 @Override 075 public void close() throws IOException { 076 this.closed = true; 077 } 078 079 @Override 080 public int read() throws IOException { 081 if (this.closed) { 082 return -1; 083 } else { 084 return this.in.read(); 085 } 086 } 087 088 @Override 089 public int read(final byte[] b, final int off, final int len) throws IOException { 090 if (this.closed) { 091 return -1; 092 } else { 093 return this.in.read(b, off, len); 094 } 095 } 096 097}