/*
 * $Header: /home/cvs/jakarta-commons/httpclient/src/java/org/apache/commons/httpclient/HttpMethodBase.java,v 1.24 2002/01/15 20:53:47 rwaldhoff Exp $
 * $Revision: 1.24 $
 * $Date: 2002/01/15 20:53:47 $
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "HttpClient", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * 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/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */

package org.apache.commons.httpclient;

import java.io.IOException;

import org.apache.commons.httpclient.log.*;

/**
 * An Http user-agent that supports multiple connections
 * to Http servers.
 *
 * @author Marc A. Saegesser
 */
public class HttpMultiClient
{
    // -------------------------------------------------------- Class Variables

    static private final Log log = LogSource.getInstance("org.apache.commons.httpclient.HttpMultiClient");

    // ----------------------------------------------------- Instance Variables
    private HttpSharedState state = null;
    private HttpConnectionManager mgr = new HttpConnectionManager();
    private boolean strictMode = true;

    // ----------------------------------------------------------- Constructors

    /**
     * No-args constructor.
     */
    public HttpMultiClient()
    {
    }

    /**
     * Set the shared state.
     *
     * @param state - the new shared state
     */
    public void setState(HttpSharedState state)
    {
        this.state = state;
    }

    /**
     * Get the shared state
     *
     * @return the shared state
     */
    public HttpSharedState getState()
    {
        if(state == null){
            state = new HttpSharedState();
        }

        return state;
    }

    /**
     *
     */
    public void setStrictMode(boolean strictMode)
    {
        this.strictMode = strictMode;
    }

    /**
     *
     */
    public boolean isStrictMode()
    {
        return strictMode;
    }

    /**
     * Execute the given {@link HttpMethod} using my current
     * {@link HttpConnection connection} and {@link HttpState}.
     *
     * @param method the {@link HttpMethod} to execute
     * @return the method's response code
     *
     * @throws IOException if an I/O error occurs
     * @throws HttpException if a protocol exception occurs
     */
    public int executeMethod(HttpUrlMethod method) throws IOException, HttpException
    {
        HttpConnection connection = mgr.getConnection(method.getUrl());
        
        int status = 0;

        method.setStrictMode(strictMode);

        status = method.execute(getState(),connection);
        mgr.releaseConnection(connection);

        if(status == 301 || status == 302 || 
           status == 303 || status == 307){
            Header header = method.getResponseHeader("Location");
            String url = header.getValue();
            if(url == null){
                log.error("HttpMultiClient.executeMethod:  Received redirect without Location header.");
                throw new HttpException("Received redirect without Location header.");
            }

            method.recycle();
            method.setUrl(url);
            return executeMethod(method);
        }

        return status;
    }

}