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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/IdentityOutputStream.java $
      3  * $Revision: 560343 $
      4  * $Date: 2007-07-27 11:18:19 -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.OutputStream;
     36 
     37 import org.apache.http.io.SessionOutputBuffer;
     38 
     39 /**
     40  * A stream for writing with an "identity" transport encoding.
     41  *
     42  * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
     43  *
     44  * @version $Revision: 560343 $
     45  *
     46  * @since 4.0
     47  */
     48 public class IdentityOutputStream extends OutputStream {
     49 
     50     /**
     51      * Wrapped session output buffer.
     52      */
     53     private final SessionOutputBuffer out;
     54 
     55     /** True if the stream is closed. */
     56     private boolean closed = false;
     57 
     58     public IdentityOutputStream(final SessionOutputBuffer out) {
     59         super();
     60         if (out == null) {
     61             throw new IllegalArgumentException("Session output buffer may not be null");
     62         }
     63         this.out = out;
     64     }
     65 
     66     /**
     67      * <p>Does not close the underlying socket output.</p>
     68      *
     69      * @throws IOException If an I/O problem occurs.
     70      */
     71     public void close() throws IOException {
     72         if (!this.closed) {
     73             this.closed = true;
     74             this.out.flush();
     75         }
     76     }
     77 
     78     public void flush() throws IOException {
     79         this.out.flush();
     80     }
     81 
     82     public void write(byte[] b, int off, int len) throws IOException {
     83         if (this.closed) {
     84             throw new IOException("Attempted write to closed stream.");
     85         }
     86         this.out.write(b, off, len);
     87     }
     88 
     89     public void write(byte[] b) throws IOException {
     90         write(b, 0, b.length);
     91     }
     92 
     93     public void write(int b) throws IOException {
     94         if (this.closed) {
     95             throw new IOException("Attempted write to closed stream.");
     96         }
     97         this.out.write(b);
     98     }
     99 
    100 }
    101