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
32package org.apache.http.impl.io;
33
34import java.io.IOException;
35import java.util.Iterator;
36
37import org.apache.http.Header;
38import org.apache.http.HttpException;
39import org.apache.http.HttpMessage;
40import org.apache.http.io.HttpMessageWriter;
41import org.apache.http.io.SessionOutputBuffer;
42import org.apache.http.message.LineFormatter;
43import org.apache.http.message.BasicLineFormatter;
44import org.apache.http.params.HttpParams;
45import org.apache.http.util.CharArrayBuffer;
46
47public 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