ifcontainerpositiontag.java

java 写的一个新闻发布系统

package org.jahia.taglibs.container;

import org.jahia.data.containers.JahiaContainer;
import org.jahia.exceptions.JahiaException;
import org.jahia.utils.JahiaConsole;

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

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


/**
 * Class IfContainerPositionTag : evaluates the body if the current container
 *                                is located at a wanted position in the list
 *
 * @author  Jerome Tamiotti
 */
public abstract class IfContainerPositionTag extends BodyTagSupport {

    public int doAfterBody() {
        // gets the parent tag ContainerTag
        ContainerTag containerTag = (ContainerTag) findAncestorWithClass(this, ContainerTag.class);
        if ( containerTag == null) {
            return SKIP_BODY;
        }
        if ( containerTag.isDeclarationPass() ) {
            return SKIP_BODY;
        }
        if ( isPositionGood(containerTag) ) {
            // 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;
    }

    // will be implemented in the different test tags
    public abstract boolean isPositionGood( ContainerTag containerTag );

}