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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  
28  package org.apache.http.impl.io;
29  
30  import java.io.IOException;
31  
32  import org.apache.http.ConnectionClosedException;
33  import org.apache.http.HttpException;
34  import org.apache.http.HttpRequest;
35  import org.apache.http.HttpRequestFactory;
36  import org.apache.http.RequestLine;
37  import org.apache.http.ParseException;
38  import org.apache.http.annotation.NotThreadSafe;
39  import org.apache.http.io.SessionInputBuffer;
40  import org.apache.http.message.LineParser;
41  import org.apache.http.message.ParserCursor;
42  import org.apache.http.params.HttpParams;
43  import org.apache.http.util.CharArrayBuffer;
44  
45  /**
46   * HTTP request parser that obtain its input from an instance
47   * of {@link SessionInputBuffer}.
48   * <p>
49   * The following parameters can be used to customize the behavior of this
50   * class:
51   * <ul>
52   *  <li>{@link org.apache.http.params.CoreConnectionPNames#MAX_HEADER_COUNT}</li>
53   *  <li>{@link org.apache.http.params.CoreConnectionPNames#MAX_LINE_LENGTH}</li>
54   * </ul>
55   *
56   * @since 4.2
57   */
58  @NotThreadSafe
59  public class DefaultHttpRequestParser extends AbstractMessageParser<HttpRequest> {
60  
61      private final HttpRequestFactory requestFactory;
62      private final CharArrayBuffer lineBuf;
63  
64      /**
65       * Creates an instance of this class.
66       *
67       * @param buffer the session input buffer.
68       * @param parser the line parser.
69       * @param requestFactory the factory to use to create
70       *    {@link HttpRequest}s.
71       * @param params HTTP parameters.
72       */
73      public DefaultHttpRequestParser(
74              final SessionInputBuffer buffer,
75              final LineParser parser,
76              final HttpRequestFactory requestFactory,
77              final HttpParams params) {
78          super(buffer, parser, params);
79          if (requestFactory == null) {
80              throw new IllegalArgumentException("Request factory may not be null");
81          }
82          this.requestFactory = requestFactory;
83          this.lineBuf = new CharArrayBuffer(128);
84      }
85  
86      @Override
87      protected HttpRequest parseHead(
88              final SessionInputBuffer sessionBuffer)
89          throws IOException, HttpException, ParseException {
90  
91          this.lineBuf.clear();
92          int i = sessionBuffer.readLine(this.lineBuf);
93          if (i == -1) {
94              throw new ConnectionClosedException("Client closed connection");
95          }
96          ParserCursor cursor = new ParserCursor(0, this.lineBuf.length());
97          RequestLine requestline = this.lineParser.parseRequestLine(this.lineBuf, cursor);
98          return this.requestFactory.newHttpRequest(requestline);
99      }
100 
101 }