openjmsdestination.java

OpenJMS是一个开源的Java Message Service API 1.0.2 规范的实现,它包含有以下特性： *. 它既支持点到点（point-to-point）（PTP）模型和发布/订

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 *    copy of this document.
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 *    nor may "Exolab" appear in their names without prior written
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 *
 * 5. Due credit should be given to the Exolab Project
 *    (http://www.exolab.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 2000 (C) Exoffice Technologies Inc. All Rights Reserved.
 *
 * $Id: OpenJMSDestination.java,v 1.1 2004/11/26 01:51:15 tanderson Exp $ *
 * Date         Author  Changes
 * $Date	    jimm    Created
 */


package org.exolab.jms.tools.admin;

import java.awt.Rectangle;
import java.text.SimpleDateFormat;

import javax.swing.JPopupMenu;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;


/**
 * This is the base class for all destination nodes. A destination is either
 * a queue or a topic.
 *
 * @version     $Revision: 1.1 $ $Date: 2004/11/26 01:51:15 $
 * @author      <a href="mailto:[e-mail]">Jim Mourikis</a>
 */
abstract public class OpenJMSDestination extends DefaultMutableTreeNode
    implements OpenJMSNode {

    // The QueueTopicName
    protected String destinationName_;

    // Does this queue topic have any registered consumers
    protected boolean isLeaf_;

    // Whether this node has been opened and explored already.
    protected boolean isExplored_ = false;

    // The popup menu for destination
    protected JPopupMenu commands_ = null;

    // A flag indicating if the menu has been created yet.
    protected boolean commandsCreated_ = false;

    // A date time formatter.
    static protected SimpleDateFormat dateFormat_;

    //  A reference to the tree this node belongs to.
    static protected JTree tree_ = null;


    /**
     * The constructor gets its unique name for this queue/topic and a
     * reference to its parent tree.
     *
     * <P>If this is the first queue/topic call, the menu for all queue/topics
     * is created.
     *
     * @param destinationName This queue/topic name.
     * @param tree The parent tree this queue/topic belongs to.
     *
     */
    public OpenJMSDestination(String destinationName, JTree tree) {
        destinationName_ = destinationName;
        isLeaf_ = false;
        if (!commandsCreated_) {
            tree_ = tree;
            createCommands();
            commandsCreated_ = true;
            dateFormat_ = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
            dateFormat_.setLenient(false);
        }
    }


    /**
     * Create the menu for all queue/topics and set up the Action events for
     * each menu item. Since menus are shared, the callbacks called are
     * static. Once a menu is slected, the slected node can be determined
     * from the parent object.
     *
     */
    abstract protected void createCommands();

    /**
     * Children are allowed for all queue/topics
     *
     * @return boolean Always returns true.
     *
     */
    public boolean getAllowsChildren() {
        return true;
    }

    /**
     * Queue/Topics are leaves iff they have no consumers registered against
     * them.
     *
     * @return boolean true if no consumers are registered.
     *
     */
    public boolean isLeaf() {
        return isLeaf_;
    }

    /**
     * This node has been right clicked. The locations of this node is given
     * by the loc object. Use this location to popup the queue/topic message
     * menu.
     *
     * @param The location of this Consumer node.
     *
     */
    public void displayCommands(Rectangle loc) {
        double x;
        double y;

        x = loc.getX();
        y = loc.getY();
        y += loc.getHeight();

        commands_.show(tree_, (int) x, (int) y);
    }

    /**
     * The unique name of this queue/topic.
     *
     * @return String the queue/topic name.
     *
     */
    public String toString() {
        return destinationName_;
    }

    /**
     * This node has changed. Inform the parent tree that it needs to be
     * re-drawn.
     *
     */
    protected void refresh() {
        DefaultTreeModel model = (DefaultTreeModel) tree_.getModel();
        model.nodeStructureChanged((DefaultMutableTreeNode) this);
    }

    /**
     * Get the particular instance of the queue/topic that has been selected.
     *
     * @return OpenJMSDestination the instance selected.
     *
     */
    static protected OpenJMSDestination getInstanceSelected() {
        Object loc = tree_.getLastSelectedPathComponent();
        return (OpenJMSDestination) loc;
    }
}