ifpageinpathtag.java

java 写的一个新闻发布系统

package org.jahia.taglibs.field.page;

import org.jahia.data.JahiaData;
import org.jahia.exceptions.JahiaException;
import org.jahia.services.pages.JahiaPage;
import org.jahia.utils.JahiaConsole;

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

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


/**
 * Class IfPageInPathTag : evaluates the body only if the given page is in the path
 *                         of the current page.
 *                         This tag must be enclosed inside a PageField tag.
 *
 * @author  Jerome Tamiotti
 */
public class IfPageInPathTag extends BodyTagSupport {

	public int doStartTag() {

		// looks for the enclosing PageField tag
		PageFieldTag parent = (PageFieldTag) findAncestorWithClass(this, PageFieldTag.class);
		if (parent == null) {
			return SKIP_BODY;
		}
		JahiaPage thePage = parent.getPage();
		if (thePage != null) {

			ServletRequest request = 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");
			}
			// loops through the current path
			try {
				Enumeration thePath = jData.page().getPagePath();
				while (thePath.hasMoreElements()) {
					JahiaPage aPage = (JahiaPage) thePath.nextElement();
					if (aPage.getID() == thePage.getID()) {
						return EVAL_BODY_BUFFERED;
					}
				}
			} catch (JahiaException je) {
				JahiaConsole.println("IfPageInPathTag: doStartTag ",je.toString());
			}
		}
        return SKIP_BODY;
    }


    public int doAfterBody() {
		try {
			bodyContent.writeOut(bodyContent.getEnclosingWriter());
		} catch (IOException ioe) {
			JahiaConsole.println("IfPageInPathTag: doAfterBody ",ioe.toString());
		}
		return SKIP_BODY;
	}
        
}