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Java example source code file (DefaultResponseParser.java)

This example source code file (DefaultResponseParser.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

abstractmessageparser, chararraybuffer, defaultresponseparser, httpexception, httpmessage, httpresponsefactory, illegalargumentexception, io, ioexception, nohttpresponseexception, override, parsercursor, sessioninputbuffer, statusline, the

The DefaultResponseParser.java example source code

/*
 * ====================================================================
 * 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.conn;

import java.io.IOException;

import org.apache.http.annotation.ThreadSafe;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpException;
import org.apache.http.HttpMessage;
import org.apache.http.HttpResponseFactory;
import org.apache.http.NoHttpResponseException;
import org.apache.http.ProtocolException;
import org.apache.http.StatusLine;
import org.apache.http.conn.params.ConnConnectionPNames;
import org.apache.http.impl.io.AbstractMessageParser;
import org.apache.http.io.SessionInputBuffer;
import org.apache.http.message.LineParser;
import org.apache.http.message.ParserCursor;
import org.apache.http.params.HttpParams;
import org.apache.http.util.CharArrayBuffer;

/**
 * Default HTTP response parser implementation. 
 * <p>
 * The following parameters can be used to customize the behavior of this 
 * class: 
 * <ul>
 *  <li>{@link org.apache.http.params.CoreConnectionPNames#MAX_HEADER_COUNT}
 *  <li>{@link org.apache.http.params.CoreConnectionPNames#MAX_LINE_LENGTH}
 *  <li>{@link org.apache.http.conn.params.ConnConnectionPNames#MAX_STATUS_LINE_GARBAGE}
 * </ul>
 * 
 * @since 4.0
 */
@ThreadSafe // no public methods
public class DefaultResponseParser extends AbstractMessageParser {
    
    private final Log log = LogFactory.getLog(getClass());
	
    private final HttpResponseFactory responseFactory;
    private final CharArrayBuffer lineBuf;
    private final int maxGarbageLines;
    
    public DefaultResponseParser(
            final SessionInputBuffer buffer,
            final LineParser parser,
            final HttpResponseFactory responseFactory,
            final HttpParams params) {
        super(buffer, parser, params);
        if (responseFactory == null) {
            throw new IllegalArgumentException
                ("Response factory may not be null");
        }
        this.responseFactory = responseFactory;
        this.lineBuf = new CharArrayBuffer(128);
        this.maxGarbageLines = params.getIntParameter(
            ConnConnectionPNames.MAX_STATUS_LINE_GARBAGE, Integer.MAX_VALUE);
    }


    @Override
    protected HttpMessage parseHead(
            final SessionInputBuffer sessionBuffer) throws IOException, HttpException {
        //read out the HTTP status string
        int count = 0;
        ParserCursor cursor = null;
        do {
            // clear the buffer
            this.lineBuf.clear();
            int i = sessionBuffer.readLine(this.lineBuf);
            if (i == -1 && count == 0) {
                // The server just dropped connection on us
                throw new NoHttpResponseException("The target server failed to respond");
            }
            cursor = new ParserCursor(0, this.lineBuf.length());
            if (lineParser.hasProtocolVersion(this.lineBuf, cursor)) {
                // Got one
                break;
            } else if (i == -1 || count >= this.maxGarbageLines) {
                // Giving up
                throw new ProtocolException("The server failed to respond with a " +
                        "valid HTTP response");
            }
            if (this.log.isDebugEnabled()) {
            	this.log.debug("Garbage in response: " + this.lineBuf.toString());
            }
            count++;
        } while(true);
        //create the status line from the status string
        StatusLine statusline = lineParser.parseStatusLine(this.lineBuf, cursor);
        return this.responseFactory.newHttpResponse(statusline, null);
    }

}

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