Java Swing Tutorial - Java Transferable .getTransferData (DataFlavor flavor)

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Syntax

Transferable.getTransferData(DataFlavor flavor) has the following syntax.

Object getTransferData(DataFlavor flavor)   throws UnsupportedFlavorException ,    IOException

Example

In the following code shows how to use Transferable.getTransferData(DataFlavor flavor) method.

// w ww.  j a v  a2s.  c  o m

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;

public class Main extends JFrame {

  public Main() {
    super("Drop Target");
    JComponent cp = (JComponent) getContentPane();
    cp.setTransferHandler(new MyFileTransferHandler()); // see below

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

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

class MyFileTransferHandler extends TransferHandler {
  public boolean canImport(JComponent com, DataFlavor[] dataFlavors) {
    for (int i = 0; i < dataFlavors.length; i++) {
      DataFlavor flavor = dataFlavors[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);
    }
    return false;
  }

  public boolean importData(JComponent comp, Transferable t) {
    DataFlavor[] flavors = t.getTransferDataFlavors();
    System.out.println("Trying to import:" + t);
    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());
          }
          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());
            return true;
          } catch (MalformedURLException ex) {
            System.err.println("Not a valid URL");
            return false;
          }
        } else {
          System.out.println("importData rejected: " + flavor);
        }
      } catch (IOException ex) {
        System.err.println("IOError getting data: " + ex);
      } catch (UnsupportedFlavorException e) {
        System.err.println("Unsupported Flavor: " + e);
      }
    }
    return false;
  }
}

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