engineresourcebundletag.java

java 写的一个新闻发布系统

package org.jahia.taglibs.resourcebundle;

import java.util.Locale;
import java.util.ResourceBundle;

import org.jahia.data.JahiaData;
import org.jahia.params.ParamBean;
import org.jahia.exceptions.JahiaException;
import org.jahia.utils.JahiaTools;
import org.jahia.utils.JahiaConsole;
import org.jahia.resourcebundle.JahiaResourceBundle;

import java.io.*;
import java.util.*;

import javax.servlet.http.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;


/**
 * Support for Engine's ResourceBundle within Jahia
 *
 * Returns the requested resource.
 *
 * If the requested resource bundle is missing and useDefault is true,
 * Jahia will look for another engine resource bundle in that order :
 *
 *		1. 	Look for the engine resource bundle of the page.
 *			This resource bundle can be set in the template used by the page
 *			with the SetEngineResourceBundleTag.
 *	
 *		2.  Look for the site's default engine resource bundle.
 *  	    Each site can have a default engine resource bundle. It's name
 *			must be of this form : "JahiaEnginesResourcesMYJAHIASITE"
 *			where MYJAHIASITE is the virtual site's sitekey in uppercase.
 *
 *		3.  Finally if none of the previous resource bundle are available,
 *			Jahia will return the internal engine's default resource bundle
 *			named "JahiaEnginesResources".
 *
 *	
 * @see JahiaResourceBundle
 * @see SetEngineResourceBundleTag
 * @see JahiaEnginesResources.properties
 *
 * @author Khue Nguyen
 */
public class EngineResourceBundleTag extends TagSupport {

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

    public static final String JAHIA_ENGINE_TAG 				= "<jahiaEngine>";
    public static final String SITE_TEMPLATE_TAG 				= "<siteTemplate>";
	
    private String resourceName   = "";
	
    public void setResourceName(String resourceName) {
    	if ( resourceName == null )
    		resourceName = "";
        this.resourceName = resourceName;
    }

    public int doStartTag() {

		HttpServletRequest request = (HttpServletRequest)pageContext.getRequest();
		JahiaData jData = (JahiaData) request.getAttribute("org.jahia.data.JahiaData");
		if (jData == null) {
			HashMap tempEngineMap = (HashMap) request.getAttribute("org.jahia.engines.EngineHashMap");
			jData                 = (JahiaData) tempEngineMap.get("jData");
		}
		
		String resValue = null;

		try {
			resValue = JahiaResourceBundle
						.getEngineResource(  resourceName,
										 	 jData.params(),
										 	 jData.params().getLocale() );
										 
		} catch ( MissingResourceException mre ) {			
		    JahiaConsole.println(CLASS_NAME+"doStartTag", mre.toString());
    	}

        if (resValue == null) {
        	resValue = "";
        }

		try {
		    JspWriter out = pageContext.getOut();
		    out.print( parseResourceValue(resValue,jData.params()) );
		} catch (IOException ioe) {
		    JahiaConsole.println(CLASS_NAME+"doStartTag", ioe.toString());
		}

	    return SKIP_BODY;

    }
    
    //--------------------------------------------------------------------------
    /**
     * parse the resource value and replace :
	 * <jahiaEngine> 	: by /jsp/jahia/engines/
	 * <siteTemplate>	: by /jsp/jahia/templates/<mysite>/
	 *					  where <mysite> is the sitekey of the current site
	 *
     * @param String val, the String to parse
     * @param ParamBean, the paramBean
     * @return String , the parsed value
     */
    public static String parseResourceValue(String val,ParamBean jParams){ 
    	
    	if ( (val == null) || (jParams == null) || (jParams.getSite()== null) )
    		return val;		
		val = JahiaTools.replacePattern(val,JAHIA_ENGINE_TAG,
														 "/jsp/jahia/engines/");
		
		val = JahiaTools.replacePattern(val,SITE_TEMPLATE_TAG,
				"/jsp/jahia/templates/" + jParams.getSite().getSiteKey() + "/");
		
		return val;    
    
    }	
    
}