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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/HttpRequestParser.java $
      3  * $Revision: 589374 $
      4  * $Date: 2007-10-28 09:25:07 -0700 (Sun, 28 Oct 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 
     36 import org.apache.http.ConnectionClosedException;
     37 import org.apache.http.HttpException;
     38 import org.apache.http.HttpMessage;
     39 import org.apache.http.HttpRequestFactory;
     40 import org.apache.http.RequestLine;
     41 import org.apache.http.ParseException;
     42 import org.apache.http.io.SessionInputBuffer;
     43 import org.apache.http.message.LineParser;
     44 import org.apache.http.message.ParserCursor;
     45 import org.apache.http.params.HttpParams;
     46 import org.apache.http.util.CharArrayBuffer;
     47 
     48 public class HttpRequestParser extends AbstractMessageParser {
     49 
     50     private final HttpRequestFactory requestFactory;
     51     private final CharArrayBuffer lineBuf;
     52 
     53     public HttpRequestParser(
     54             final SessionInputBuffer buffer,
     55             final LineParser parser,
     56             final HttpRequestFactory requestFactory,
     57             final HttpParams params) {
     58         super(buffer, parser, params);
     59         if (requestFactory == null) {
     60             throw new IllegalArgumentException("Request factory may not be null");
     61         }
     62         this.requestFactory = requestFactory;
     63         this.lineBuf = new CharArrayBuffer(128);
     64     }
     65 
     66     protected HttpMessage parseHead(
     67             final SessionInputBuffer sessionBuffer)
     68         throws IOException, HttpException, ParseException {
     69 
     70         this.lineBuf.clear();
     71         int i = sessionBuffer.readLine(this.lineBuf);
     72         if (i == -1) {
     73             throw new ConnectionClosedException("Client closed connection");
     74         }
     75         ParserCursor cursor = new ParserCursor(0, this.lineBuf.length());
     76         RequestLine requestline = this.lineParser.parseRequestLine(this.lineBuf, cursor);
     77         return this.requestFactory.newHttpRequest(requestline);
     78     }
     79 
     80 }
     81