ifnotcurrentpagetag.java

java 写的一个新闻发布系统

package org.jahia.taglibs.field.page;

import org.jahia.data.*;
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 IfNotCurrentPageTag : evaluates the body only if the page contained in the 
 *                             enclosing PageFieldTag is not the current page.
 *                             This tag is the "else" part of the "IfCurrentPage" tag.
 *                             This tag must be enclosed inside a PageField tag.
 *
 * @author  Jerome Tamiotti
 */
public class IfNotCurrentPageTag 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");
			}
			if (jData.page().getID() != thePage.getID()) {
				return EVAL_BODY_INCLUDE;
			}
		}
		return SKIP_BODY;
	}


    public int doAfterBody() {

		try {
			BodyContent body = getBodyContent();
			if ( body != null ){
			    JspWriter out = body.getEnclosingWriter();
			    out.print(body.getString());
			}
		} catch (IOException ioe) {
			JahiaConsole.println("IfNotCurrentPageTag: doAfterBody ", ioe.toString());
		}
        return SKIP_BODY;
    }
}