Dropper.java Source code

Introduction

Here is the source code for Dropper.java

Source

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS 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 AUTHOR OR 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.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

import java.awt.Toolkit;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Iterator;
import java.util.List;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.TransferHandler;

/**
 * Dropper - show File Drop Target from Drag-n-Drop
 * 
 * @version $Id: Dropper.java,v 1.1 2004/04/10 00:12:25 ian Exp $
 */
public class Dropper extends JFrame {

    /**
     * Construct trivial GUI and connect a TransferHandler to it.
     */
    public Dropper() {
        super("Drop Target");

        JComponent cp = (JComponent) getContentPane();
        cp.setTransferHandler(new MyFileTransferHandler()); // see below

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(150, 150);
    }

    /** Instantiate and show the GUI */
    public static void main(String[] args) {
        new Dropper().setVisible(true);
    }
}

/** Non-public class to handle filename drops */

class MyFileTransferHandler extends TransferHandler {

    /**
     * @see javax.swing.TransferHandler#canImport(javax.swing.JComponent,
     *      java.awt.datatransfer.DataFlavor[])
     */
    public boolean canImport(JComponent arg0, DataFlavor[] arg1) {
        for (int i = 0; i < arg1.length; i++) {
            DataFlavor flavor = arg1[i];
            if (flavor.equals(DataFlavor.javaFileListFlavor)) {
                System.out.println("canImport: JavaFileList FLAVOR: " + flavor);
                return true;
            }
            if (flavor.equals(DataFlavor.stringFlavor)) {
                System.out.println("canImport: String FLAVOR: " + flavor);
                return true;
            }
            System.err.println("canImport: Rejected Flavor: " + flavor);
        }
        // Didn't find any that match, so:
        return false;
    }

    /**
     * Do the actual import.
     * 
     * @see javax.swing.TransferHandler#importData(javax.swing.JComponent,
     *      java.awt.datatransfer.Transferable)
     */
    public boolean importData(JComponent comp, Transferable t) {
        DataFlavor[] flavors = t.getTransferDataFlavors();
        System.out.println("Trying to import:" + t);
        System.out.println("... which has " + flavors.length + " flavors.");
        for (int i = 0; i < flavors.length; i++) {
            DataFlavor flavor = flavors[i];
            try {
                if (flavor.equals(DataFlavor.javaFileListFlavor)) {
                    System.out.println("importData: FileListFlavor");

                    List l = (List) t.getTransferData(DataFlavor.javaFileListFlavor);
                    Iterator iter = l.iterator();
                    while (iter.hasNext()) {
                        File file = (File) iter.next();
                        System.out.println("GOT FILE: " + file.getCanonicalPath());
                        // Now do something with the file...
                    }
                    return true;
                } else if (flavor.equals(DataFlavor.stringFlavor)) {
                    System.out.println("importData: String Flavor");
                    String fileOrURL = (String) t.getTransferData(flavor);
                    System.out.println("GOT STRING: " + fileOrURL);
                    try {
                        URL url = new URL(fileOrURL);
                        System.out.println("Valid URL: " + url.toString());
                        // Do something with the contents...
                        return true;
                    } catch (MalformedURLException ex) {
                        System.err.println("Not a valid URL");
                        return false;
                    }
                    // now do something with the String.

                } else {
                    System.out.println("importData rejected: " + flavor);
                    // Don't return; try next flavor.
                }
            } catch (IOException ex) {
                System.err.println("IOError getting data: " + ex);
            } catch (UnsupportedFlavorException e) {
                System.err.println("Unsupported Flavor: " + e);
            }
        }
        // If you get here, I didn't like the flavor.
        Toolkit.getDefaultToolkit().beep();
        return false;
    }
}