clistpaginationfirstitemindextag.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.data.containers.JahiaContainerListPagination;
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.*;


/**
 * Return the index of the first listed item ( container ) in the current displayed page ( container list pagination ).
 *
 * @author  NK
 */
public class CListPaginationFirstItemIndexTag extends BodyTagSupport {

    public int doStartTag() {
        //JahiaConsole.println("CListPaginationFirstItemIndexTag: doStartTag", "Started");

        int index = 0;
        // gets the enclosing tag ContainerListTag
        ContainerListTag containerListTag = (ContainerListTag) findAncestorWithClass(this, ContainerListTag.class);
        if (containerListTag != null && !containerListTag.isDeclarationPass()) {
        	JahiaContainerList cList = containerListTag.getContainerList();
        	if ( cList != null )
        	{
        		JahiaContainerListPagination cPagination = cList.getCtnListPagination();
        		if ( cPagination != null && cPagination.isValid() )
        		{
        			index = cPagination.getFirstItemIndex();
        			if ( cPagination.getSize()>0 )
        			{
        				index+=1;
        			}	
        		} else if ( cList.size()<=0 ) {
        			index = 0;
    			} else {
    				index = 1;
    			}	   			
				try {
		            JspWriter out = pageContext.getOut();
		            out.print(index);
				} catch (IOException ioe) {
				    JahiaConsole.println("ContainerListFirstItemTag: doStartTag ",ioe.toString());
				}
            }
        }
        return SKIP_BODY;
    }

}