DragDropTest.java

package dragdroptest;

import processing.core.PApplet;

import java.awt.dnd.*;
import java.awt.datatransfer.*;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.*;

public class DragDropTest extends PApplet implements DropTargetListener {

	Pattern pattern = Pattern.compile("^(http://open\\.spotify\\.com\\/(:?track|album|artist|(:?user/.+?/playlist))/[a-zA-Z0-9]+)$", Pattern.MULTILINE);

	public void setup() {
		size(320, 240);

		DropTarget dt = new DropTarget(this, this);		
	}

	public void draw() {
	}

	public static void main(String _args[]) {
		PApplet
				.main(new String[] { dragdroptest.DragDropTest.class.getName() });
	}

	public void dragEnter(DropTargetDragEvent event) {
		event.acceptDrag(DnDConstants.ACTION_COPY);		
	}

	public void dragExit(DropTargetEvent event) {
	}

	public void dragOver(DropTargetDragEvent event) {
		event.acceptDrag(DnDConstants.ACTION_COPY);		
	}

	public void drop(DropTargetDropEvent event) {
		event.acceptDrop(DnDConstants.ACTION_COPY);
		
		Transferable transferable = event.getTransferable();
		DataFlavor flavors[] = transferable.getTransferDataFlavors();
		
		int successful = 0;

		List<String> found = new ArrayList<String>();

		for (int i = 0; i < flavors.length; i++) {
			try {
				Object stuff = transferable.getTransferData(flavors[i]);

				if (stuff instanceof String) {
					Matcher m = pattern.matcher((String)stuff);
					while (m.find()) {
						String s = m.group(0);
						if (!found.contains(s)) {							
							found.add(s);
						}
					}
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		
		System.out.print("\n\n!!! Found: " + found);				
	}

	public void dropActionChanged(DropTargetDragEvent event) {
	}
}