managelogs_engine.java

java 写的一个新闻发布系统

//
//                                   ____.
//                       __/\ ______|    |__/\.     _______
//            __   .____|    |       \   |    +----+       \
//    _______|  /--|    |    |    -   \  _    |    :    -   \_________
//   \\______: :---|    :    :           |    :    |         \________>
//           |__\---\_____________:______:    :____|____:_____\
//                                      /_____|
//
//                 . . . i n   j a h i a   w e   t r u s t . . .
//

//
//  ManageLogs_Engine
//  MJ  27.02.20001
//
//  getInstance()
//  authoriseRender()
//  renderLink()
//  needsJahiaData()
//  handleActions()
//

package org.jahia.engines.audit;

import java.util.*;                                 // HashMap
import javax.servlet.http.*;                        // HttpSession

import org.jahia.exceptions.*;                  // JahiaException
import org.jahia.utils.*;                       // JahiaConsole
import org.jahia.data.*;                        // JahiaData, ConnectionTypes
import org.jahia.params.*;                      // ParamBean
import org.jahia.registries.*;                  // ServicesRegistry
import org.jahia.engines.*;                     // JahiaEngine interface

import org.jahia.exceptions.JahiaSessionExpirationException;

public class ManageLogs_Engine implements JahiaEngine {


    private static  final String TEMPLATE_JSP            = "/jsp/jahia/engines/audit/sendlogs.jsp";
    private static        ManageLogs_Engine theObject    = null;
    private               String              engineName = "audit";
    private               EngineToolBox       toolBox;


    /***
        * constructor
        *
        */
    private ManageLogs_Engine()
    {
        // JahiaConsole.println( "Engine",
        //                 "***** Starting ManageLogs Engine *****" );
        toolBox = EngineToolBox.getInstance();
    } // end constructor



    /***
        * returns a single instance of the object
        *
        */
    public static synchronized ManageLogs_Engine getInstance()
    {
        if (theObject == null) {
            theObject = new ManageLogs_Engine();
        }
        return theObject;
    } // end getInstance



    /***
        * authoriseRender
        *
        */
    public boolean authoriseRender( ParamBean jParams )
    {
        return toolBox.authoriseRender( jParams );
    } // end authoriseRender



    /***
        * renderLink
        * no params allowed
        */
    public String renderLink( ParamBean jParams, Object theObj )
    throws JahiaException
    {
        return jParams.composeEngineUrl( engineName );
    } // end renderLink



    /***
        * needsJahiaData
        *
        */
    public boolean needsJahiaData( ParamBean jParams )
    {
        return false;
    } // end needsJahiaData



    /***
        * handles the engine actions
        *
        * @param        jParams             a ParamBean object
        * @param        jData               a JahiaData object (not mandatory)
        *
        */
    public void handleActions (ParamBean jParams, JahiaData jData)
        throws  JahiaException,
                JahiaSessionExpirationException
    {
        // initalizes the hashmap
        HashMap engineMap = initEngineMap( jParams );

        // displays the screen
        toolBox.displayScreen( jParams, engineMap );

    } // end handleActions



    /***
        * inits the engine map
        *
        * @param        jParams     a ParamBean object
        *                           (with request and response)
        * @return       a HashMap object containing all the basic values
        *               needed by an engine
        *
        */
    private HashMap initEngineMap( ParamBean jParams )
        throws  JahiaException,
                JahiaSessionExpirationException
    {
        HashMap engineMap = new HashMap();

        // gets session values
        //HttpSession theSession = jParams.getRequest().getSession( true );
        HttpSession theSession = jParams.getSession ();

        engineMap = (HashMap) theSession.getAttribute( "jahia_session_engineMap" );

        ///////////////////////////////////////////////////////////////////////////////////////
        // FIXME -Fulco-
        //
        //      This is a quick hack, engineMap should not be null if the session didn't
        //      expired. Maybe there are other cases where the engineMap can be null, I didn't
        //      checked them at all.
        ///////////////////////////////////////////////////////////////////////////////////////
        if (engineMap == null) {
            throw new JahiaSessionExpirationException ();
        }


        engineMap.put( "jParams", jParams );
        engineMap.put( "renderType", new Integer(JahiaEngine.RENDERTYPE_FORWARD) );
        engineMap.put( "engineName", engineName );
        engineMap.put( "engineOutputFile", TEMPLATE_JSP  );
        theSession.setAttribute( "jahia_session_engineMap", engineMap );


        // sets engineMap for JSPs
        jParams.getRequest().setAttribute( "org.jahia.engines.EngineHashMap", engineMap );

        return engineMap;
    } // end initEngineMap




} // end ManageLogs_Engine