abstractservlet.java

web版的SVN客户端

/*
 * Copyright (c) 2004, 2005 Polarion Software, All rights reserved.
 * Email: [e-mail]
 *
 * This program and the accompanying materials are made available under the
 * terms of the Apache License, Version 2.0 (the "License"). You may not use
 * this file except in compliance with the License. Copy of the License is
 * located in the file LICENSE.txt in the project distribution. You may also
 * obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 *
 * POLARION SOFTWARE MAKES NO REPRESENTATIONS OR WARRANTIES
 * ABOUT THE SUITABILITY OF THE SOFTWARE, EITHER EXPRESSED OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. POLARION SOFTWARE
 * SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT
 * OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 */
package org.polarion.svnwebclient.web.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.polarion.svnwebclient.SVNWebClientException;
import org.polarion.svnwebclient.data.AuthenticationException;
import org.polarion.svnwebclient.data.DataProviderException;
import org.polarion.svnwebclient.data.IDataProvider;
import org.polarion.svnwebclient.web.SystemInitializing;
import org.polarion.svnwebclient.web.support.RequestHandler;
import org.polarion.svnwebclient.web.support.State;

/**
 * 
 * @author <A HREF="mailto:[e-mail]">Polarion Software </A>
 */
public abstract class AbstractServlet extends HttpServlet {
    protected State state;
    protected RequestHandler requestHandler;
    
    protected void execute(HttpServletRequest request, HttpServletResponse response) throws ServletException {        
        this.state = new State(request, response);
        this.requestHandler = this.getRequestHandler(request);   
        IDataProvider dataProvider = null;
        SystemInitializing initialize = new SystemInitializing();
        try {
        	dataProvider = initialize.init(request, response, this.requestHandler);
        	if (dataProvider == null) {
        		return;
        	} else {
        		this.executeSVNOperation(dataProvider);
        	}
        } catch (AuthenticationException e) {        	        	        	
			initialize.redirectToRestrictPage();
			return;            
        } catch (SVNWebClientException e) {
        	Logger.getLogger(this.getClass()).error(e, e);
        	throw new ServletException(e);
        } finally {
            if (dataProvider != null) {
                try {
                    dataProvider.close();
                } catch (DataProviderException e) {
                }
            }
        }                        
    }
      
    protected abstract void executeSVNOperation(IDataProvider dataProvider) throws SVNWebClientException;
    protected abstract RequestHandler getRequestHandler(HttpServletRequest request);     
}