sites_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 . . .
//

//
//  Sites_Engine
//  NK   21.05.2001
//

package org.jahia.engines.sites;

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

import org.jahia.utils.*;           // JahiaConsole
import org.jahia.data.*;            // JahiaData
import org.jahia.params.*;          // ParamBean
import org.jahia.engines.*;         // JahiaEngine interface
import org.jahia.registries.ServicesRegistry;
import org.jahia.services.sites.*;
import org.jahia.exceptions.JahiaException;
import org.jahia.exceptions.JahiaSessionExpirationException;
import org.jahia.exceptions.JahiaForbiddenAccessException;


public class Sites_Engine implements JahiaEngine {

    private static  Sites_Engine     	theObject   = null;
    private         String          	engineName  = "sites";
    private static  final String  		TEMPLATE_JSP	= "/jsp/jahia/engines/sites/sites_launcher.jsp";
    private         EngineToolBox       toolBox;

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


    /**
     *
     */
    public static synchronized Sites_Engine getInstance()
    {
        if (theObject == null) {
            theObject = new Sites_Engine();
        }
        return theObject;
    }


    /***
     * authoriseRender
     *
     */
    public boolean authoriseRender( ParamBean jParams )
    {
        return (jParams.getOperationMode() == jParams.EDIT);
    }


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


    /**
     *
     *
     */
    public String renderLink( ParamBean jParams, Object theObj )
    throws JahiaException
    {
        String params = "";
        return jParams.composeEngineUrl( engineName, params );
    }



    /**
     *
     *
     */
    public void handleActions( ParamBean jParams, JahiaData jData )
    throws JahiaException
    {
        process(jParams);
    }



    /***
        * process
        *
        */
    public void process(ParamBean jParams)
    throws JahiaException
    {

        // compose a new hashmap with engine properties...
        HashMap engineMap = initEngineMap(jParams);

        toolBox.displayScreen( jParams, engineMap );

    }


    //-------------------------------------------------------------------------
    /***
        * 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
    {
        // init engine map
        HashMap engineMap = new HashMap();

        // build the sites lists
        Vector vec = new Vector();
        Enumeration enum = vec.elements();

        JahiaSitesService sitesServ = ServicesRegistry.getInstance()
                                                            .getJahiaSitesService();

        if ( sitesServ != null ){
            try {
                enum = sitesServ.getSites();
            } catch (JahiaException ex) {
                enum = vec.elements();
            }
        }

        boolean isSuperAdmin = jParams.getUser().isAdminMember(0);

        while ( enum.hasMoreElements() ){
            JahiaSite site = (JahiaSite)enum.nextElement();
            if ( isSuperAdmin || jParams.getUser().isAdminMember(site.getID()) ){
                vec.add(site);
            }
        }
        engineMap.put ("jParams", jParams);
        engineMap.put ("renderType", new Integer(JahiaEngine.RENDERTYPE_FORWARD));
        engineMap.put ("engineName", engineName);
        engineMap.put ("engineUrl", jParams.composeEngineUrl( engineName, "" ));
        engineMap.put ( "engineOutputFile", TEMPLATE_JSP );

        engineMap.put("sitesList", vec.elements());

        return engineMap;

    } // end initEngineMap




} // end Sites_Engine