ifclistpaginationcurrentpagetag.java

java 写的一个新闻发布系统

package org.jahia.taglibs.pagination;

import org.jahia.data.containers.JahiaContainerList;
import org.jahia.exceptions.JahiaException;
import org.jahia.taglibs.util.Utils;
import org.jahia.taglibs.container.ContainerListTag;
import org.jahia.utils.JahiaConsole;

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

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


/**
 * This tag evaluates its body only when the enclosing ContainerListPagination.isCurrentpage() return true.
 *
 * @author NK
 */
public class IfCListPaginationCurrentPageTag extends BodyTagSupport {
	
	private boolean doEvaluateBody = false;
	
    public int doStartTag() {
        // gets the enclosing tag ContainerListTag
        CListPaginationTag containerListPaginationTag = (CListPaginationTag) findAncestorWithClass(this, CListPaginationTag.class);
        if (containerListPaginationTag == null) {
            JahiaConsole.println("IfCListPaginationCurrentPageTag: doStartTag", "No container list pagination tag found !!");
            return SKIP_BODY;
        }
        if (containerListPaginationTag.isCurrentPage()) {
            //JahiaConsole.println("IfCListPaginationCurrentPageTag: doStartTag", "Current page : " + containerListPaginationTag.getPageNumber());
            this.doEvaluateBody = true;
            return EVAL_BODY_BUFFERED;
        }
        return SKIP_BODY;
    }

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

}