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      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 
     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 
     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 
     70     public void close() throws IOException {
     71         this.closed = true;
     72     }
     73 
     74     public int read() throws IOException {
     75         if (this.closed) {
     76             return -1;
     77         } else {
     78             return this.in.read();
     79         }
     80     }
     81 
     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