core_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 . . .
//

//
//  Core_Engine
//  AK   14.12.2000
//  AK   19.12.2000  use the EngineRenderer class
//  AK   04.01.2001  change EngineRenderer call
//
//  getInstance()
//  authoriseRender()
//  renderLink()
//  needsJahiaData()
//  handleActions()
//

package org.jahia.engines.core;

import java.util.*;                     // HashMap

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


public class Core_Engine implements JahiaEngine {

    private static final String CLASS_NAME = Core_Engine.class.getName();

    private static  Core_Engine     theObject   = null;
    private         String          engineName  = "core";



    /***
        * constructor
        * AK    14.12.2000
        *
        */
    private Core_Engine()
    {
        // JahiaConsole.println( "Engine", "***** Starting CORE Engine *****" );
    } // end constructor



    /***
        * getInstance
        * AK    14.12.2000
        *
        */
    public static synchronized Core_Engine getInstance()
    {
        if (theObject == null) {
            theObject = new Core_Engine();
        }
        return theObject;
    } // end getInstance



    /***
        * authoriseRender
        * AK    14.12.2000
        *
        */
    public boolean authoriseRender( ParamBean jParams )
    {
        return (jParams.getOperationMode() == jParams.EDIT);
    } // end authoriseRender



    /***
        * needsJahiaData
        * AK    14.12.2000
        *
        */
    public boolean needsJahiaData( ParamBean jParams )
    {
        return true;
    } // end needsJahiaData



    /***
        * renderLink
        * AK    14.12.2000
        *
        */
    public String renderLink( ParamBean jParams, Object theObj )
    throws JahiaException
    {
        String params = "";
//        params += "&op=" + jParams.getOperationMode();
//        params += "&pid=" + jParams.getPageID();
        params += "/op/" + jParams.getOperationMode();
        params += "/pid/" + jParams.getPageID();
        return jParams.composeEngineUrl( engineName, params );

    }



    /***
        * handleActions
        * AK    14.12.2000
        * AK    04.01.2001  use processCore()...
        *
        */
    public void handleActions( ParamBean jParams, JahiaData jData )
    throws JahiaException
    {
        String ipAddr = jParams.getRequest().getRemoteAddr();
        JahiaConsole.println( "Core_Engine.handleActions", "Generating content for " + ipAddr + "..." );
        processCore( jData );
    } // end handleAction



    /***
        * processCore
        * AK    04.01.2001
        *
        */
    public void processCore( JahiaData jData )
    throws JahiaException
    {

        // increment for each corerequest
        if ( jData.params().newPageRequest()
             || (jData.params().getLastEngineName() == null)
             || (jData.params().getLastEngineName().equals(engineName)) ){
            jData.params().getPage().incrementCounter();
            jData.params().getPage().commitChanges(false);
        }

        // compose the fileName...
        String fileName = jData.params().getPage().getPageTemplate().getSourcePath();

        // compose a new hashmap with engine properties...
        HashMap engineHashMap = new HashMap();
        engineHashMap.put("engineName",         engineName);
        engineHashMap.put("engineOutputFile",   fileName);
        engineHashMap.put("renderType",         new Integer(JahiaEngine.RENDERTYPE_FORWARD));

        EngineRenderer.getInstance().render( jData, engineHashMap );
    } // end processCore


} // end Core_Engine