containertag.java

java 写的一个新闻发布系统

package org.jahia.taglibs.container;

import org.jahia.data.JahiaData;
import org.jahia.data.containers.*;
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 ContainerTag : retrieves the container list which it belongs to, loops through the
 *                      containers and displays the fields of each container
 *
 * @author  Jerome Tamiotti
 */
public class ContainerTag extends BodyTagSupport {


    private Enumeration containers;

    private boolean first = true;
    private boolean last = true;
    private JahiaContainer container = null;
    private JahiaContainer firstContainer = null;
    private int counter = 1;

    private boolean initLoop = true;

    private boolean display = true;

    public boolean displayBody() {
        return display;
    }

    public boolean isFirst() {
        return this.first;
    }

    public boolean isLast() {
        return this.last;
    }

    public JahiaContainer getContainer() {
        return this.container;
    }

    public int getCounter() {
        return this.counter;
    }

    public boolean isDeclarationPass() {
        // gets the current container list
        ContainerListTag cListTag = (ContainerListTag) getParent();
        if (cListTag == null) {
            return false;
        } else {
            return cListTag.isDeclarationPass();
        }
    }


    public int doStartTag() {
        initLoop = true;

        ContainerListTag cListTag = (ContainerListTag) getParent();
        if (cListTag.isDeclarationPass()) {
            // JahiaConsole.println("ContainerTag.doStartTag",
            //                     cListTag.getName() + " : Declaration Pass Beginning...");
        } else {
            JahiaContainerList containerList = cListTag.getContainerList();
            if (containerList == null)
                return SKIP_BODY;

            if (initLoop) {
                // here is stuff we need to do only once...
                // reads the containers of this list
                containers = containerList.getContainers();
                int ct = 0;
                if (containers.hasMoreElements()) {
                    this.container = (JahiaContainer)containers.nextElement();
                    if (ct == 0) {
                        this.firstContainer = this.container;
                    }
                    if (containers.hasMoreElements()) {
                        this.last = false;
                    }
                } else {
                    this.counter = 0;
                    this.display = false;
                }
                containers = containerList.getContainers();
                if (containers.hasMoreElements()) {
                    this.container = (JahiaContainer) containers.nextElement();
                } else {
                    return SKIP_BODY;
                }
                initLoop = false;
            }
        }
        return EVAL_BODY_BUFFERED;
    }


    // loops through the next elements
    public int doAfterBody() throws JspException {
        // gets the current container list
        ContainerListTag cListTag = (ContainerListTag) getParent();
        if (cListTag.isDeclarationPass()) {
            //JahiaConsole.println("ContainerTag.doAfterBody",
            //                     cListTag.getName() + " : Declaration Pass Ended.");
            return SKIP_BODY;
        }

        /*
        JahiaConsole.println("ContainerTag.doAfterBody",
                             cListTag.getName() + " : Post-declaration pass (counter=" + Integer.toString(this.counter) + ")");
        */


        if (this.display) {
            try {
                getBodyContent().writeOut(getPreviousOut());
                getBodyContent().clear();
                this.counter++;
            } catch (IOException ioe) {
                throw new JspTagException();
            }
            
            if (containers != null){
                if (containers.hasMoreElements()) {
                    // JahiaConsole.println("ContainerTag.doAfterBody", "Processing next container in list");
                    this.container = (JahiaContainer)containers.nextElement();
                    // not the first one anymore
                    this.first = false;
                    // checks if it's the last one
                    if (!containers.hasMoreElements()) {
                        this.last = true;
                    }
                    return EVAL_BODY_BUFFERED;
                } else {
                    this.display = false;
                }
            }
        }
        return SKIP_BODY;
    }

}