clistpaginationcurrentpagescrollingvalue.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 scrolling value of the current page returned from the enclosing ContainerListTag.
 *
 * If the attribute valueOnly = "true" ( default value ), returns :
 * <pre>
 *		windowSize + "_" + windowOffset, i.e. : '5_10'
 * <pre>
 *
 * Else if valueOnly = "false", generate a hidden input :
 * <pre>
 *		<input type="hidden" name="ctnscroll_contentList1" value="5_10">
 *
 *		Where : 'contentList1' is the name of the container list
 *				'5_10 : the combination of windowSize = 5, windowOffset = 10 regarding to the values of the enclosing container list.
 *
 * </pre> 
 *
 * @author  NK
 */
public class CListPaginationCurrentPageScrollingValue extends BodyTagSupport {

    private JahiaContainerList containerList = null;
    private JahiaContainerListPagination cPagination = null;

	private String valueOnly = "true";

    public void setValueOnly(String value) {
        if ( value != null ){
        	this.valueOnly = value.trim().toLowerCase();
        }
    }

    public String getValueOnly() {
        return this.valueOnly;
    }
	
	
    public int doStartTag() {

        //JahiaConsole.println("CListPaginationCurrentPageScrollingValue: doStartTag", "Started");

        // gets the enclosing tag ContainerListTag
        ContainerListTag containerListTag = (ContainerListTag) findAncestorWithClass(this, ContainerListTag.class);
        if (containerListTag == null || containerListTag.isDeclarationPass()) {
        	return SKIP_BODY;
        }	

        containerList = containerListTag.getContainerList();
        if ( containerList == null ){
        	return SKIP_BODY;
		}        

  		cPagination = containerList.getCtnListPagination();
  		if ( cPagination == null ){
        	return SKIP_BODY;
		}  			

		String value = cPagination.getScrollingValue(cPagination.getCurrentPageIndex());
		if ( value == null ){
        	return SKIP_BODY;
		}

		if ( this.valueOnly.equals("false") )
		{
			try {
				StringBuffer buff = new StringBuffer("<input type='hidden' name='");
				buff.append("ctnscroll_");
				buff.append(containerList.getDefinition().getName());
				buff.append("' value='");
				buff.append(value);
				buff.append("'>");
				value = buff.toString();			
			} catch ( Throwable t ) {
				t.printStackTrace();
				return SKIP_BODY;
			}
		}	

		try {
            JspWriter out = pageContext.getOut();
            out.print(value);
		} catch (IOException ioe) {
		    JahiaConsole.println("CListPaginationCurrentPageScrollingValue: doStartTag ",ioe.toString());
		}
        return SKIP_BODY;
    }
}