exportaction.java

myjxta是用jxta开发的一个p2p通讯软件 有聊天 文件共享 视频3大功能 界面采用swing

/*
*  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 THE APACHE SOFTWARE FOUNDATION 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: ExportAction.java,v 1.3 2007/01/26 21:54:31 bondolo Exp $
*/
package net.jxta.myjxta.ui.action;

import net.jxta.logging.Logging;
import net.jxta.myjxta.View;
import net.jxta.myjxta.util.Constants;
import net.jxta.myjxta.util.Group;
import net.jxta.myjxta.util.Peer;
import net.jxta.myjxta.util.Resources;
import net.jxta.myjxta.util.objectmodel.GroupNode;
import net.jxta.myjxta.util.objectmodel.JxtaNode;
import net.jxta.myjxta.util.objectmodel.PeerNode;
import net.jxta.protocol.PeerGroupAdvertisement;
import net.jxta.protocol.PipeAdvertisement;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.StringReader;
import java.util.ResourceBundle;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @version $Id: ExportAction.java,v 1.3 2007/01/26 21:54:31 bondolo Exp $
 *
 * @author james todd [gonzo at jxta dot org]
 */

public class ExportAction
    extends AbstractAction {

    private static final String HYPHEN = "-";
    private static final String DOT = ".";
    private static final int BLOCK = 4 * 1024;
    private static final ResourceBundle STRINGS = Resources.getStrings();
    
    private static final Logger LOG = Logger.getLogger(ExportAction.class.getName());
                
    private View view = null;

    public ExportAction(String name, View view) {
        super(name);

        this.view = view;
    }

    public void actionPerformed(ActionEvent ae) {
        JxtaNode jn = this.view.getJxtaNode(JxtaNode.class);
        
        if (jn instanceof PeerNode ||
            jn instanceof GroupNode) {
            process(getName(jn), getValue(jn));
        }
    }

    private void process(String n, String v) {
        JFileChooser fc = new JFileChooser();
        
        fc.setSelectedFile(new File(fc.getCurrentDirectory(), n));
        
        if (fc.showSaveDialog((Frame)this.view) ==
            JFileChooser.APPROVE_OPTION) {
            File f = fc.getSelectedFile();
            
            if (f.isDirectory()) {
                f = new File(n);
            }
            
            File p = f.getParentFile();
            
            if (! p.exists()) {
                p.mkdirs();
            }
            
            FileWriter w = null;
            String msg = STRINGS.getString("status.export") + " " + n;
            
            try {
                w = new FileWriter(f, true);
            } catch (IOException ioe) {
                msg = STRINGS.getString("error.export") + " " + n;
            }
            
            if (w != null) {
                try {
                    f.createNewFile();

                    StringReader r = new StringReader(v);
                    char[] buf = new char[BLOCK];
                    int l = 0;
                
                    while ((l = r.read(buf, 0, BLOCK)) > -1) {
                        w.write(buf, 0, l);
                    }
                } catch (IOException ioe) {
                    msg = STRINGS.getString("error.export") + " " + n;
                } finally {
                    if (w != null) {
                        try {
                            w.close();
                        } catch (IOException ioe) {
                            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                                LOG.log(Level.SEVERE,
                                        "Caught unexpected Exception", ioe);
                            }
                        }
                    }
                }
                
                this.view.setStatus(msg);
            }
        }
    }

    private String getName(JxtaNode jn) {
        String n = null;
        
        if (jn instanceof PeerNode) {
            Peer p = ((PeerNode)jn).getPeer();
            
            n = STRINGS.getString("label.peer.export") + HYPHEN +
                p.getName() + DOT + Constants.JXTA_RESOURCE;
        } else if (jn instanceof GroupNode) {
            Group g = ((GroupNode)jn).getGroup();
            
            n = STRINGS.getString("label.group.export") + HYPHEN +
                g.getName() + DOT + Constants.JXTA_RESOURCE;
        }
        
        return n;
    }
    
    private String getValue(JxtaNode jn) {
        String v = null;
        
        if (jn instanceof PeerNode) {
            Peer p = ((PeerNode)jn).getPeer();
            PipeAdvertisement pa = p.getPipeAdvertisement();
            
            v = pa.toString();
        } else if (jn instanceof GroupNode) {
            Group g = ((GroupNode)jn).getGroup();
            PeerGroupAdvertisement pga = g.getPeerGroupAdvertisement();
            
            v = pga.toString();
        }
        
        return v;
    }
}