/*
* $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/tags/4.0/module-main/src/main/java/org/apache/http/impl/io/HttpRequestParser.java $
* $Revision: 744526 $
* $Date: 2009-02-14 18:04:18 +0100 (Sat, 14 Feb 2009) $
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.impl.io;
import java.io.IOException;
import org.apache.http.ConnectionClosedException;
import org.apache.http.HttpException;
import org.apache.http.HttpMessage;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestFactory;
import org.apache.http.RequestLine;
import org.apache.http.ParseException;
import org.apache.http.io.SessionInputBuffer;
import org.apache.http.message.LineParser;
import org.apache.http.message.ParserCursor;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.params.HttpParams;
import org.apache.http.util.CharArrayBuffer;
/**
* HTTP request parser that obtain its input from an instance
* of {@link SessionInputBuffer}.
*
* @since 4.0
*/
public class HttpRequestParser extends AbstractMessageParser {
private final HttpRequestFactory requestFactory;
private final CharArrayBuffer lineBuf;
/**
* Creates an instance of this class.
* <p>
* The following HTTP parameters affect the initialization:
* <p>
* {@link CoreConnectionPNames#MAX_HEADER_COUNT} parameter determines
* the maximum HTTP header count allowed. If set to a positive value,
* the number of HTTP headers received from the data stream exceeding
* this limit will cause an IOException. A negative or zero value will
* effectively disable the check. Per default the check is disabled.
* <p>
* {@link CoreConnectionPNames#MAX_LINE_LENGTH} parameter determines
* the maximum line length limit. If set to a positive value, any HTTP line
* exceeding this limit will cause an IOException. A negative or zero value
* will effectively disable the check the check. Per default the check is
* disabled.
*
* @param buffer the session input buffer.
* @param parser the line parser.
* @param requestFactory the factory to use to create
* {@link HttpRequest}s.
* @param params HTTP parameters.
*/
public HttpRequestParser(
final SessionInputBuffer buffer,
final LineParser parser,
final HttpRequestFactory requestFactory,
final HttpParams params) {
super(buffer, parser, params);
if (requestFactory == null) {
throw new IllegalArgumentException("Request factory may not be null");
}
this.requestFactory = requestFactory;
this.lineBuf = new CharArrayBuffer(128);
}
protected HttpMessage parseHead(
final SessionInputBuffer sessionBuffer)
throws IOException, HttpException, ParseException {
this.lineBuf.clear();
int i = sessionBuffer.readLine(this.lineBuf);
if (i == -1) {
throw new ConnectionClosedException("Client closed connection");
}
ParserCursor cursor = new ParserCursor(0, this.lineBuf.length());
RequestLine requestline = this.lineParser.parseRequestLine(this.lineBuf, cursor);
return this.requestFactory.newHttpRequest(requestline);
}
}