ifcontainerlistsizetag.java

java 写的一个新闻发布系统

package org.jahia.taglibs.container;

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.*;


/**
 * Class IfContainerListSizeTag : this tag evaluates its body only when the size of
 *                the enclosing container list passes the comparison test using the
 *                given operator and value
 *
 * @author  Jerome Tamiotti
 */
public class IfContainerListSizeTag extends BodyTagSupport {

    private String op;
    private int value;

    public void setOp(String op) {
        this.op = op;
    }

    public void setValue(int value) {
        this.value = value;
    }

    public int doAfterBody() {
        // gets the enclosing tag ContainerListTag
        ContainerListTag containerListTag = (ContainerListTag) findAncestorWithClass(this, ContainerListTag.class);
        if (containerListTag == null) {
            JahiaConsole.println("IfContainerListSize: doAfterBody", "No container list tag found !!");
            return SKIP_BODY;
        }
        if (containerListTag.isDeclarationPass()) {
            return SKIP_BODY;
        }
        JahiaContainerList containerList = containerListTag.getContainerList();
        if (containerList == null) {
            JahiaConsole.println("IfContainerListSize: doAfterBody", "NULL container list in tag !!");
            return SKIP_BODY;
        }
        Enumeration containers = containerList.getContainers();
        if ( Utils.compare( Utils.enumSize(containers), op, value ) ) {
            // the current container is the first of the stack
            try {
                BodyContent body = getBodyContent();
                JspWriter out = body.getEnclosingWriter();
                out.print(body.getString());
            } catch (IOException ioe) {
                JahiaConsole.println("IfFirstContainerTag: doAfterBody ",ioe.toString());
            }
        }
        return SKIP_BODY;
    }

}