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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/AbstractMessageWriter.java $
      3  * $Revision: 569673 $
      4  * $Date: 2007-08-25 06:58:51 -0700 (Sat, 25 Aug 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.util.Iterator;
     36 
     37 import org.apache.http.Header;
     38 import org.apache.http.HttpException;
     39 import org.apache.http.HttpMessage;
     40 import org.apache.http.io.HttpMessageWriter;
     41 import org.apache.http.io.SessionOutputBuffer;
     42 import org.apache.http.message.LineFormatter;
     43 import org.apache.http.message.BasicLineFormatter;
     44 import org.apache.http.params.HttpParams;
     45 import org.apache.http.util.CharArrayBuffer;
     46 
     47 public abstract class AbstractMessageWriter implements HttpMessageWriter {
     48 
     49     protected final SessionOutputBuffer sessionBuffer;
     50     protected final CharArrayBuffer lineBuf;
     51     protected final LineFormatter lineFormatter;
     52 
     53     public AbstractMessageWriter(final SessionOutputBuffer buffer,
     54                                  final LineFormatter formatter,
     55                                  final HttpParams params) {
     56         super();
     57         if (buffer == null) {
     58             throw new IllegalArgumentException("Session input buffer may not be null");
     59         }
     60         this.sessionBuffer = buffer;
     61         this.lineBuf = new CharArrayBuffer(128);
     62         this.lineFormatter = (formatter != null) ?
     63             formatter : BasicLineFormatter.DEFAULT;
     64     }
     65 
     66     protected abstract void writeHeadLine(HttpMessage message)
     67         throws IOException
     68         ;
     69 
     70     public void write(
     71             final HttpMessage message) throws IOException, HttpException {
     72         if (message == null) {
     73             throw new IllegalArgumentException("HTTP message may not be null");
     74         }
     75         writeHeadLine(message);
     76         for (Iterator it = message.headerIterator(); it.hasNext(); ) {
     77             Header header = (Header) it.next();
     78             this.sessionBuffer.writeLine
     79                 (lineFormatter.formatHeader(this.lineBuf, header));
     80         }
     81         this.lineBuf.clear();
     82         this.sessionBuffer.writeLine(this.lineBuf);
     83     }
     84 
     85 }
     86