DefaultResponseParser.java revision 069490a5ca2fd1988d29daf45d892f47ad665115 
1/*
2 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/impl/conn/DefaultResponseParser.java $
3 * $Revision: 617638 $
4 * $Date: 2008-02-01 12:49:26 -0800 (Fri, 01 Feb 2008) $
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.conn;
33
34import java.io.IOException;
35
36import org.apache.http.HttpException;
37import org.apache.http.HttpMessage;
38import org.apache.http.HttpResponseFactory;
39import org.apache.http.NoHttpResponseException;
40import org.apache.http.ProtocolException;
41import org.apache.http.StatusLine;
42import org.apache.http.conn.params.ConnConnectionPNames;
43import org.apache.http.impl.io.AbstractMessageParser;
44import org.apache.http.io.SessionInputBuffer;
45import org.apache.http.message.LineParser;
46import org.apache.http.message.ParserCursor;
47import org.apache.http.params.HttpParams;
48import org.apache.http.util.CharArrayBuffer;
49
50public class DefaultResponseParser extends AbstractMessageParser {
51
52    private final HttpResponseFactory responseFactory;
53    private final CharArrayBuffer lineBuf;
54    private final int maxGarbageLines;
55
56    public DefaultResponseParser(
57            final SessionInputBuffer buffer,
58            final LineParser parser,
59            final HttpResponseFactory responseFactory,
60            final HttpParams params) {
61        super(buffer, parser, params);
62        if (responseFactory == null) {
63            throw new IllegalArgumentException
64                ("Response factory may not be null");
65        }
66        this.responseFactory = responseFactory;
67        this.lineBuf = new CharArrayBuffer(128);
68        this.maxGarbageLines = params.getIntParameter(
69            ConnConnectionPNames.MAX_STATUS_LINE_GARBAGE, Integer.MAX_VALUE);
70    }
71
72
73    @Override
74    protected HttpMessage parseHead(
75            final SessionInputBuffer sessionBuffer) throws IOException, HttpException {
76        // clear the buffer
77        this.lineBuf.clear();
78        //read out the HTTP status string
79        int count = 0;
80        ParserCursor cursor = null;
81        do {
82            int i = sessionBuffer.readLine(this.lineBuf);
83            if (i == -1 && count == 0) {
84                // The server just dropped connection on us
85                throw new NoHttpResponseException("The target server failed to respond");
86            }
87            cursor = new ParserCursor(0, this.lineBuf.length());
88            if (lineParser.hasProtocolVersion(this.lineBuf, cursor)) {
89                // Got one
90                break;
91            } else if (i == -1 || count >= this.maxGarbageLines) {
92                // Giving up
93                throw new ProtocolException("The server failed to respond with a " +
94                        "valid HTTP response");
95            }
96            count++;
97        } while(true);
98        //create the status line from the status string
99        StatusLine statusline = lineParser.parseStatusLine(this.lineBuf, cursor);
100        return this.responseFactory.newHttpResponse(statusline, null);
101    }
102
103}
104