Check drop target mime type in Java

/*/*from  ww  w.j  a v  a2 s  .co m*/
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
*/
/*
 * NewDropTest.java A simple drag & drop tester application.
 */

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextArea;

public class Main extends JFrame implements DropTargetListener {

  DropTarget dt;

  JTextArea ta;

  public Main() {
    super("Drop Test");
    setSize(300, 300);

    getContentPane().add(
        new JLabel("Drop a list from your file chooser here:"),
        BorderLayout.NORTH);
    ta = new JTextArea();
    ta.setBackground(Color.white);
    getContentPane().add(ta, BorderLayout.CENTER);

    // Set up our text area to recieve drops...
    // This class will handle drop events
    // dt = new DropTarget(ta, this);
    setVisible(true);
  }

  public void dragEnter(DropTargetDragEvent dtde) {
    System.out.println("Drag Enter");
  }

  public void dragExit(DropTargetEvent dte) {
    System.out.println("Source: " + dte.getSource());
    System.out.println("Drag Exit");
  }

  public void dragOver(DropTargetDragEvent dtde) {
    System.out.println("Drag Over");
  }

  public void dropActionChanged(DropTargetDragEvent dtde) {
    System.out.println("Drop Action Changed");
  }

  public void drop(DropTargetDropEvent dtde) {
    try {
      // Ok, get the dropped object and try to figure out what it is
      Transferable tr = dtde.getTransferable();
      DataFlavor[] flavors = tr.getTransferDataFlavors();
      for (int i = 0; i < flavors.length; i++) {
        System.out.println("Possible flavor: "
            + flavors[i].getMimeType());
        // Check for file lists specifically
        if (flavors[i].isFlavorJavaFileListType()) {
          // Great! Accept copy drops...
          dtde.acceptDrop(DnDConstants.ACTION_COPY);
          ta.setText("Successful file list drop.\n\n");

          // And add the list of file names to our text area
          java.util.List list = (java.util.List) tr
              .getTransferData(flavors[i]);
          for (int j = 0; j < list.size(); j++) {
            ta.append(list.get(j) + "\n");
          }

          // If we made it this far, everything worked.
          dtde.dropComplete(true);
          return;
        }
      }
      // Hmm, the user must not have dropped a file list
      System.out.println("Drop failed: " + dtde);
      dtde.rejectDrop();
    } catch (Exception e) {
      e.printStackTrace();
      dtde.rejectDrop();
    }
  }

  public static void main(String args[]) {
    new Main();
  }
}