content: /*
   * Copyright (c) 1997 - 2016
   * Actelion Pharmaceuticals Ltd.
   * Gewerbestrasse 16
   * CH-4123 Allschwil, Switzerland
   *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   * 3. Neither the name of the the copyright holder nor the
   *    names of its contributors may be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * @author Christian Rufener
   */
  
  package com.actelion.research.gui.dnd;
  
  import com.actelion.research.chem.*;
  import com.actelion.research.chem.dnd.ChemistryFlavors;
  import com.actelion.research.chem.reaction.Reaction;
  import com.actelion.research.chem.reaction.ReactionEncoder;
  
  import java.awt.*;
  import java.awt.datatransfer.DataFlavor;
  import java.awt.datatransfer.Transferable;
  import java.awt.dnd.*;
  public class ReactionDropAdapter implements DropTargetListener
  {
  	public static final boolean debug = false;
  
  	private boolean active_ = true;
  
  	private final int mAllowedDropAction = DnDConstants.ACTION_COPY_OR_MOVE;
  
  	public ReactionDropAdapter()
  	{
  	}
  
  	public void onDropReaction(Reaction rxn, Point pt)
  	{
  		DEBUG("ReactionDropAdapter.onDropReaction(). Override this! " + rxn);
  	}
  
  
  	public void dragEnter(DropTargetDragEvent e)
  	{
  		DEBUG("DragEnter");
  	}
  
  	public void dragOver(DropTargetDragEvent e)
  	{
  		DEBUG("DragOver");
  	}
  
  	public void setActive(boolean active)
  	{
  		active_ = active;
  	}
  
  	public boolean isActive()
  	{
  		return active_;
  	}
  
  	public void dropActionChanged(DropTargetDragEvent e)
  	{
  		DEBUG("dropActionChanged");
  	}
  
  	public void dragExit(DropTargetEvent e)
  	{
  		DEBUG("dragExit");
  	}
  
  
  	public void drop(DropTargetDropEvent e)
  	{
  		if (active_) {
  			// This is neccesary to make sure the correct classloader tries to load the Transferable
  			ClassLoader cl = this.getClass().getClassLoader();
  			DEBUG("ReactionDropAdapter   ClassLoader " + cl);
  			DEBUG("ReactionDropAdapter   Ignoring setContextclassloader!!!");
  //            Thread.currentThread().setContextClassLoader(cl);
  			DEBUG("ReactionDropAdapter " + e);
  			try {
  				Transferable tr = e.getTransferable();
  				DEBUG("Transferable is " + tr);
  				DataFlavor chosen = chooseDropFlavor(e);
  				Reaction rxn = null;
  				if (chosen != null) {
  					e.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
  					DEBUG("Chose is " + chosen);
  					Object o = tr.getTransferData(chosen);
  					DEBUG("Object is " + o);
  					rxn = createFromDataFlavor(chosen,o);
  					if (rxn != null) {
  						onDropReaction(rxn, e.getLocation());
  						e.dropComplete(true);
  					} else {
  						System.err.println("Drop failed: " + e);
  						e.dropComplete(false);
  					}
  					return;
  				} else {
  					System.err.println("Drop failed: " + e);
  					e.rejectDrop();
  				}
  			} catch (Exception ex) {
  				ex.printStackTrace();
  			}
  		}
  	}
  
  	public DataFlavor[] getFlavors()
  	{
  		return ChemistryFlavors.REACTION_FLAVORS;
  	}
  
  
  	protected Reaction createFromDataFlavor(DataFlavor chosen, Object o) throws Exception {
  		Reaction rxn = null;
  		if (chosen.equals(ChemistryFlavors.DF_SERIALIZED_REACTION) && o instanceof Reaction) {
  			rxn = new Reaction((Reaction)o);
  		} else if (chosen.equals(ChemistryFlavors.DF_REACTION_SMILES) && o instanceof String) {
  			rxn = new SmilesParser().parseReaction((String)o);
  		} else if (chosen.equals(DataFlavor.stringFlavor) && o instanceof String) {
  			try {
  				rxn = ReactionEncoder.decode((String)o, true);
  			} catch(Throwable t) {
  				System.err.println("Unable to instantiate reaction from text flavor " + o);
  				rxn = null;
  			}
  		} else {
  			System.err.println("Unable to instantiate flavor " + chosen);
  //            throw new InstantiationException("Unable to instantiate flavor " + chosen);
  		}
  		return rxn;
  	}
  
  
  	protected boolean isDragFlavorSupported(DropTargetDragEvent e) {
  		for (int i=0; i<ChemistryFlavors.REACTION_FLAVORS.length; i++) {
  			if (e.isDataFlavorSupported(ChemistryFlavors.REACTION_FLAVORS[i])) {
  				return true;
  			}
  		}
  		return false;
  	}
  
  	protected DataFlavor chooseDropFlavor(DropTargetDropEvent e) {
  		for (int i=0; i<ChemistryFlavors.REACTION_FLAVORS.length; i++) {
  			if (e.isDataFlavorSupported(ChemistryFlavors.REACTION_FLAVORS[i])) {
  				return ChemistryFlavors.REACTION_FLAVORS[i];
  			}
  		}
  		return null;
  	}
  
  	public boolean isDropOK(DropTargetDragEvent e) {
  		if (!isDragFlavorSupported(e)) {
  			return false;
  		}
  		return ((e.getDropAction() & mAllowedDropAction) != 0);
  	}
  
  	private void DEBUG(String s) {
  		if (debug) {
  			System.err.println(s);
  			System.err.flush();
  		}
  	}
  }
  