downloadtemplate_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 . . .
//

//
//  DownloadTemplate_Engine
//  EV      30.11.2000
//
//  getInstance()
//  authoriseRender()
//  renderLink()
//  needsJahiaData()
//  handleActions()
//

package org.jahia.engines.downloadtemplate;

import java.io.*;                       // PrintWriter
import org.jahia.utils.*;           // JahiaConsole
import org.jahia.data.*;            // JahiaData
import org.jahia.services.pages.JahiaPage;
import org.jahia.services.pages.JahiaPageDefinition;
import org.jahia.params.*;          // ParamBean
import org.jahia.engines.*;         // JahiaEngine interface
import org.jahia.gui.*;             // FieldForms
import org.jahia.registries.*;      // ServicesRegistry
import org.jahia.exceptions.JahiaException;


public class DownloadTemplate_Engine implements JahiaEngine {

    private static  DownloadTemplate_Engine theObject   = null;
    private         String                  engineName  = "downloadtemplate";



    /***
        * constructor
        * EV    30.11.2000
        *
        */
    private DownloadTemplate_Engine()
    {
        // JahiaConsole.println( "Engine", "***** Starting DownloadTemplate Engine *****" );
    } // end constructor



    /***
        * getInstance
        * EV    30.11.2000
        *
        */
    public static synchronized DownloadTemplate_Engine getInstance()
    {
        if (theObject == null) {
            theObject = new DownloadTemplate_Engine();
        }
        return theObject;
    } // end getInstance



    /***
        * authoriseRender
        * EV    30.11.2000
        *
        */
    public boolean authoriseRender( ParamBean jParams )
    {
        return (jParams.getOperationMode() == jParams.EDIT);
    } // end authoriseRender



    /***
        * renderLink
        * EV    30.11.2000
        *
        */
    public String renderLink( ParamBean jParams, Object theObj )
    throws JahiaException
    {
        String params = "";
//        params += "&mode=displaywindow";
        params += "?mode=displaywindow";
        return jParams.composeEngineUrl( engineName, params );
    } // end renderLink



    /***
        * needsJahiaData
        * EV    30.11.2000
        *
        */
    public boolean needsJahiaData( ParamBean jParams )
    {
        return false;
    } // end needsJahiaData



    /***
        * handleActions
        * EV    30.11.2000
        *
        */
    public void handleActions( ParamBean jParams, JahiaData jData )
    throws JahiaException
    {
        String mode     = jParams.getRequest().getParameter( "mode" );
        String ipAddr   = jParams.getRequest().getRemoteAddr();
        if (mode != null) {
            if (mode.equals("displaywindow")) {
                JahiaConsole.println( "DownloadTemplate_Engine", ipAddr + " is displaying DownloadTemplate Window"  );
                displayFormWindow( jParams );
            } else if (mode.equals("processform")) {
                JahiaConsole.println( "DownloadTemplate_Engine", ipAddr + " is processing DownloadATemplate Form"  );
                processForm( jParams );
            }
        }
    } // end handleAction



    /***
        * displayFormWindow()
        * EV    30.11.2000
        *
        */
    public void displayFormWindow( ParamBean jParams )
    throws JahiaException
    {
        String  html        = "";

        String urlParams    = "";
        urlParams           += "&mode=processform";
        String theUrl       = jParams.composeEngineUrl( engineName, urlParams );

        html += "<center><table border=\"0\" width=\"90%\"><tr>\n";
        html += "<td width=\"100%\" colspan=\"2\" bgcolor=\"#333333\">\n";
        html += "<font face=\"arial\" size=\"2\">Please choose template to download :</font>\n";
        html += "</td></tr>\n";
        html += "<tr><td width\"20%\" valign=\"top\">&nbsp;</td>\n";
        html += "<td width=\"80%\">";

        html += "<form method=\"POST\" action=\"" + theUrl + "\">\n";

        // ONLY FOR DEBUG PURPOSES
        // should be performed by browsing through a LDAP server
        html += "<select name=\"templateid\" size=\"5\">\n";
        html += "<option value=\"1\" selected> Compas Template </option>\n";
        html += "</select>\n";

        html += "</form>\n";
        html += "</td></tr></table>\n";

        EngineRenderer.getInstance().render( jParams, engineName, html );
    }
    // end displayFormWindow



    /***
        * processForm()
        * EV    29.11.2000
        *
        */
    public void processForm( ParamBean jParams )
        throws JahiaException
    {
        String templateIDStr = "";
        try {
            PrintWriter out = jParams.getResponse().getWriter();
            jParams.getResponse().setContentType( "text/html" );
            out.println( "<center> Computing values... </center>" );

            templateIDStr = jParams.getRequest().getParameter( "templateid" );

            if (templateIDStr != null)
            {
                int templateID = Integer.parseInt( templateIDStr );

                // ONLY FOR DEBUG PURPOSES
                // should be performed by parsing an XML file
                String urlPath = "";
                String diskPath = "";
                String fileName = "";
                String tempTitle = "";




                //////////////////////////////////////////////////////////////////////////////
                //  FIXME -Fulco-
                //
                //      Oops .. this is real dirty code !!!!!!!
                //        1. A unique case should not be in a switch statement
                //           but only in an if statement.
                //        2. NOTHING should be hardcoded in the source code.
                //
                //      I'm looking forward the author of this will change it
                //      as soon as possible !
                //
                //////////////////////////////////////////////////////////////////////////////
                switch (templateID) {
                    case (1) :  tempTitle   = "Compas Template";
                                fileName    = "compas.jsp";
                                urlPath     = "http://www.jahia.org/jahia/templates/";
                                diskPath    = "compas";
                                break;
                }







                if ((!urlPath.equals("")) && (!diskPath.equals("")) &&
                    (!fileName.equals("")) && (!tempTitle.equals("")))
                {
                    if (ServicesRegistry.getInstance().getJahiaFileTransferService().downloadTemplate( fileName, urlPath, diskPath ))
                    {
                        String tempPath = jParams.settings().getTemplatesContext() + diskPath + "/" + fileName;



                        //////////////////////////////////////////////////////////////////////
                        // FIXME -Fulco-
                        //
                        //      The person who coded this class should check if the default
                        //      parameters (I inserted) are correct in the page template
                        //      creation below.
                        //
                        //      Thanks.
                        //
                        //////////////////////////////////////////////////////////////////////
                        JahiaPageDefinition theTemplate = ServicesRegistry.
                                getInstance().getJahiaPageTemplateService().
                                createPageTemplate (jParams.getPage().getJahiaID(),
                                tempTitle, tempPath,
                                true,   	// is visible
                                "",  		// no image
                                jParams.getSiteID() );
                    }
                }
                                                                                                                                                    }
            out.println( "<script language=\"javascript\" src=\"" + jParams.settings().getJsHttpPath() + "\">" );
            out.println( "</script>" );
            out.println( "<script language=\"javascript\">" );
            out.println( "  CloseJahiaWindow();" );
            out.println( "</script>" );

        } catch (NullPointerException npe) {
            String errorMsg = "Cannot retrieve POST templateID (" + templateIDStr + ") : " + npe.getMessage() + " -> BAILING OUT";
            JahiaConsole.println( "DownloadTemplate_Engine", errorMsg );
            throw new JahiaException(   "Error in Jahia parameters",
                                        errorMsg, JahiaException.PARAMETER_ERROR, JahiaException.CRITICAL );
        } catch (NumberFormatException nfe) {
            String errorMsg = "Template id parameter is not a number (" + templateIDStr + ") : " + nfe.getMessage() + " -> BAILING OUT";
            JahiaConsole.println( "DownloadTemplate_Engine", errorMsg );
            throw new JahiaException(   "Error in Jahia parameters",
                                        errorMsg, JahiaException.PARAMETER_ERROR, JahiaException.CRITICAL );
        } catch (IOException ie) {
            String errorMsg = "Error while handling the DownloadTemplate Window : " + ie.getMessage() + " -> BAILING OUT";
            JahiaConsole.println( "DownTemplate_Engine", errorMsg );
            throw new JahiaException(   "Error while handling a Jahia window's content",
                                        errorMsg, JahiaException.DATA_ERROR, JahiaException.CRITICAL );
        }
    }
    // end processForm



} // end DownloadTemplate_Engine