Dropify.java

package dropify;

import processing.core.PApplet;
import processing.core.PImage;

import java.awt.dnd.*;
import java.awt.datatransfer.*;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.regex.*;

public class Dropify extends PApplet implements DropTargetListener {

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

	PImage bgInactive, bgActive;
	boolean active = false;
	
	public void setup() {
		size(256, 256);

		DropTarget dt = new DropTarget(this, this);
		
		bgInactive = loadImage("Spotify-inactive-256x256.png");
		bgActive = loadImage("Spotify-active-256x256.png");
		
		smooth();
		noLoop();
	}

	public void draw() {
		background(213);
		if (active) {
			background(bgActive);			
		} else {
			background(bgInactive);
		}
	}
	
	public void mouseClicked() {
		if (true) return;
		
		println("clicked! " + active);
		active = ! active;
		redraw();
	}
	
	private String send() {
		String response = null;
		try {
			Socket clientSocket = new Socket("localhost", 1234);
			
			DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
			BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
			
			Iterator<String> iter = found.iterator();
			StringBuffer message = new StringBuffer();
			while (iter.hasNext()) {
				message.append(iter.next() + "\n");
			}
			
			outToServer.writeBytes(message.toString());
//			response = inFromServer.readLine();
			
			clientSocket.close();
			
			found.clear();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		return response;
	}
	
	public void dragEnter(DropTargetDragEvent event) {
		event.acceptDrag(DnDConstants.ACTION_COPY);
		active = true;
		redraw();
	}

	public void dragExit(DropTargetEvent event) {
		active = false;
		redraw();
	}

	public void dragOver(DropTargetDragEvent event) {
		event.acceptDrag(DnDConstants.ACTION_COPY);		
		
		active = true;
		redraw();
	}

	public void drop(DropTargetDropEvent event) {
		event.acceptDrop(DnDConstants.ACTION_COPY);
		
		Transferable transferable = event.getTransferable();
		DataFlavor flavors[] = transferable.getTransferDataFlavors();
		
		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);
		if (!found.isEmpty()) {
			event.dropComplete(true);
			send();
		} else {
			event.dropComplete(false);
		}
		
		active = false;
		redraw();
	}

	public void dropActionChanged(DropTargetDragEvent event) {
//		println("dropActionChanged");
	}

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