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.nio.entity; 029 030import java.io.IOException; 031import java.io.InputStream; 032 033import org.apache.http.io.BufferInfo; 034import org.apache.http.nio.util.ContentInputBuffer; 035import org.apache.http.util.Args; 036 037/** 038 * {@link InputStream} adaptor for {@link ContentInputBuffer}. 039 * 040 * @since 4.0 041 */ 042public class ContentInputStream extends InputStream { 043 044 private final ContentInputBuffer buffer; 045 046 public ContentInputStream(final ContentInputBuffer buffer) { 047 super(); 048 Args.notNull(buffer, "Input buffer"); 049 this.buffer = buffer; 050 } 051 052 @Override 053 public int available() throws IOException { 054 if (this.buffer instanceof BufferInfo) { 055 return ((BufferInfo) this.buffer).length(); 056 } else { 057 return super.available(); 058 } 059 } 060 061 @Override 062 public int read(final byte[] b, final int off, final int len) throws IOException { 063 return this.buffer.read(b, off, len); 064 } 065 066 @Override 067 public int read(final byte[] b) throws IOException { 068 if (b == null) { 069 return 0; 070 } 071 return this.buffer.read(b, 0, b.length); 072 } 073 074 @Override 075 public int read() throws IOException { 076 return this.buffer.read(); 077 } 078 079 @Override 080 public void close() throws IOException { 081 // read and discard the remainder of the message 082 final byte tmp[] = new byte[1024]; 083 while (this.buffer.read(tmp, 0, tmp.length) >= 0) { 084 } 085 super.close(); 086 } 087 088}