MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

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 MainClass extends JFrame {

    public MainClass() {
        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 MainClass().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;
    }
}