metadatasharedemo.java

jxta-cms-src-2.4.zip 是官网上的比较稳定的CMS源代码。目前是最稳定的高版本。

/*
 * Copyright (c) 2001 Sun Microsystems, Inc.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL SUN MICROSYSTEMS 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.
 *
 *====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 *
 * $Id: MetadataShareDemo.java,v 1.3 2002/04/20 18:26:01 rmjohnson Exp $
 *
 */

package net.jxta.test;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

import java.lang.reflect.InvocationTargetException;
import java.io.File;
import java.io.IOException;

import net.jxta.peergroup.PeerGroup;
import net.jxta.peergroup.PeerGroupFactory;
import net.jxta.exception.PeerGroupException;

import net.jxta.impl.peergroup.Platform;
import net.jxta.impl.peergroup.GenericPeerGroup;

import net.jxta.share.*;
import net.jxta.share.metadata.*;

/**
 * Simple application that demonstrates how to share a file using CMS and 
 * annotate it using they Keywords and Description implementations of
 * ContentMetadata.
 *
 * @see MetadataSearchDemo
 * @see ShareDemo
 * @see net.jxta.share.metadata.ContentMetadata
 * @see net.jxta.share.metadata.Keywords
 * @see net.jxta.share.metadata.Description
 * @see net.jxta.share.ContentManager
 * @version $Revision: 1.3 $
 */
public class MetadataShareDemo {

    private PeerGroup netPeerGroup  = null;
    private CMS cms = null;

    private JFileChooser fc = new JFileChooser(new File("."));

    static public void main(String args[]) {
	//start MetadataShareDemo
        new MetadataShareDemo();
    }
    public MetadataShareDemo() {
        startJxta();

        ShareWindow window = new ShareWindow();
        window.setVisible(true);
    }

    /**
     * initializes NetPeerGroup and the CMS
     */
    private void startJxta() {
	try {
	    // create, and Start the default jxta NetPeerGroup
	    netPeerGroup = PeerGroupFactory.newNetPeerGroup();
	    
	    //uncomment the following line if you want to start the app defined
	    // the NetPeerGroup Advertisement (by default it's the shell)
	    // in this case we want use jxta directly.
	    
	    // netPeerGroup.startApp(null);
	    
	    //instanciate and initialize a content management service for 
	    //the NetPeerGroup
	    cms = new CMS();
	    cms.init(netPeerGroup, null, null);
	    
	    //set up a MetadataShareDemo directory inside the JXTA_HOME dir
	    String homedir = System.getProperty("JXTA_HOME");
	    homedir = (homedir != null) ? homedir + "MetadataShareDemo" 
		: "MetadataShareDemo";
	    
	    //start CMS, creating a directory named ShareDemo to store the
	    // ContentAdvertisement cache in.
	    if(cms.startApp(new File(homedir)) == -1) {
		System.out.println("CMS initialization failed");
		System.exit(-1);
	    }
	    
	} catch ( PeerGroupException e) {
	    // could not instanciate the group, print the stack and exit
	    System.out.println("fatal error : group creation failure");
	    e.printStackTrace();
	    System.exit(1);
	} 
    }

    /**
     * Inner class that defines the MetadataShareDemo GUI
     */
    public class ShareWindow extends Frame implements ActionListener {

        Button shareButton;
        List fileList;

        public ShareWindow() {
            super("Metadata Share Demo");
            setSize(450, 250);
            addWindowListener(new WindowMonitor());

            Panel toolbar = new Panel();
            toolbar.setLayout(new FlowLayout(FlowLayout.LEFT));

            shareButton = new Button("Share");
            shareButton.addActionListener(this);
            toolbar.add(shareButton);

            add(toolbar, BorderLayout.NORTH);

            fileList = new java.awt.List();
            add(fileList, BorderLayout.CENTER);
            
            //immediately fill the list with content that is being shared
            updateLocalFiles();
        }

	public void actionPerformed(ActionEvent e) {
	    System.out.println(e.getActionCommand());
	    
	    //handle the event of the "Share" button being clicked
	    if (e.getSource().equals(shareButton)) {
		//prompt the user to choose a file to share
		int returnVal = fc.showOpenDialog(this);
		
		if (returnVal == JFileChooser.APPROVE_OPTION) {
		    File file = fc.getSelectedFile();
		    Object[] choices = { "keywords", "description"};
		    
		    //display a dialog asking which metadata scheme to use
		    String input = (String)JOptionPane.showInputDialog(this, "Choose a metadata scheme to use to annotate the file", "", JOptionPane.QUESTION_MESSAGE, null, choices , choices[0]);
		    
		    //metadata must be passed into ContentManager.share() as
		    // an array.  A null is passed in instead if no metadata
		    // was specified
		    ContentMetadata mdata[] = null;

		    //construct the appropriate type of metadata depending on
		    // the user's choice
		    if(input != null) {
			if(input.equals("keywords")) {

			    input = JOptionPane.showInputDialog(this, "Enter a comma-separated list of keywords describing the file");

			    if(input != null) {
				mdata = new ContentMetadata[1];
				
				//create a metadata element using the
				//"keywords" scheme
				mdata[0] = new Keywords(input);
			    }
			} else if(input.equals("description")) {
			    input = JOptionPane.showInputDialog(this, "Enter a description of the file");
			    if(input != null) {
				mdata = new ContentMetadata[1];
				
				//create a metadata element using the
				//"description" scheme
				mdata[0] = new Description(input);
			    }
			}
		    }
		    
		    //this is where a real application would open the file.
		    System.out.println("Sharing: " + file.getName() + ".");
		    try {
			//ContentManager.share() will share and advertise a
			// file using a ContentAdvertisement containing the
			// metadata that was just created. Passing in nulls for
			// the name and content type will cause the content to
			// be advertised under the name of the file prefix, and
			// advertised as being the content type that is
			// determined by this ContentManager's getMimeType()
			// function.
			cms.getContentManager().share(file,null,null,mdata);
			
			//update the list of shared content
			updateLocalFiles();
		    } catch (IOException ex) {
			System.out.println("Share command failed.");
		    }		    		    
		} else {
		    System.out.println("Share command cancelled by user.");
		}
	    }
	}
	
	/**
	 * Refreshes the list of shared content
	 */
        private void updateLocalFiles() {
	    //ContentManager.getContent() retrieves all of the content that is
	    // being shared by this peer.
            Content[] content = cms.getContentManager().getContent();
	    
	    //erase the list of shared content...
            fileList.removeAll();

	    //...and repopulate it
            for (int i=0; i<content.length; i++) {
                fileList.add(content[i].getContentAdvertisement().getName());
            }
        }
    }

    /**
     * A window adapter to take care of cleanup
     */
    class WindowMonitor extends WindowAdapter {
        public void windowClosing(WindowEvent e) {
            Window w = e.getWindow();
            w.setVisible(false);
            w.dispose();
            System.exit(0);
        }
    }
}