1 /* 2 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/impl/io/IdentityInputStream.java $ 3 * $Revision: 560358 $ 4 * $Date: 2007-07-27 12:30:42 -0700 (Fri, 27 Jul 2007) $ 5 * 6 * ==================================================================== 7 * Licensed to the Apache Software Foundation (ASF) under one 8 * or more contributor license agreements. See the NOTICE file 9 * distributed with this work for additional information 10 * regarding copyright ownership. The ASF licenses this file 11 * to you under the Apache License, Version 2.0 (the 12 * "License"); you may not use this file except in compliance 13 * with the License. You may obtain a copy of the License at 14 * 15 * http://www.apache.org/licenses/LICENSE-2.0 16 * 17 * Unless required by applicable law or agreed to in writing, 18 * software distributed under the License is distributed on an 19 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 20 * KIND, either express or implied. See the License for the 21 * specific language governing permissions and limitations 22 * under the License. 23 * ==================================================================== 24 * 25 * This software consists of voluntary contributions made by many 26 * individuals on behalf of the Apache Software Foundation. For more 27 * information on the Apache Software Foundation, please see 28 * <http://www.apache.org/>. 29 * 30 */ 31 32 package org.apache.http.impl.io; 33 34 import java.io.IOException; 35 import java.io.InputStream; 36 37 import org.apache.http.io.SessionInputBuffer; 38 39 /** 40 * A stream for reading from a {@link SessionInputBuffer session input buffer}. 41 * 42 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a> 43 * 44 * @version $Revision: 560358 $ 45 * 46 * @since 4.0 47 */ 48 public class IdentityInputStream extends InputStream { 49 50 private final SessionInputBuffer in; 51 52 private boolean closed = false; 53 IdentityInputStream(final SessionInputBuffer in)54 public IdentityInputStream(final SessionInputBuffer in) { 55 super(); 56 if (in == null) { 57 throw new IllegalArgumentException("Session input buffer may not be null"); 58 } 59 this.in = in; 60 } 61 available()62 public int available() throws IOException { 63 if (!this.closed && this.in.isDataAvailable(10)) { 64 return 1; 65 } else { 66 return 0; 67 } 68 } 69 close()70 public void close() throws IOException { 71 this.closed = true; 72 } 73 read()74 public int read() throws IOException { 75 if (this.closed) { 76 return -1; 77 } else { 78 return this.in.read(); 79 } 80 } 81 read(final byte[] b, int off, int len)82 public int read(final byte[] b, int off, int len) throws IOException { 83 if (this.closed) { 84 return -1; 85 } else { 86 return this.in.read(b, off, len); 87 } 88 } 89 90 } 91