/*******************************************************************************
 *  Copyright (c) 2010 Association for Decentralized Information Management in
 *  Industry THTH ry.
 *  All rights reserved. This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License v1.0
 *  which accompanies this distribution, and is available at
 *  http://www.eclipse.org/legal/epl-v10.html
 *
 *  Contributors:
 *      VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.databoard.example.old;

import java.awt.geom.Rectangle2D;
import java.io.IOException;

import org.simantics.databoard.Bindings;
import org.simantics.databoard.Datatypes;
import org.simantics.databoard.binding.Binding;
import org.simantics.databoard.binding.RecordBinding;
import org.simantics.databoard.binding.error.BindingException;
import org.simantics.databoard.type.Datatype;

/**
 * {@link Binding} is a link between an instance and a {@link Datatype}.
 * {@link Datatypes#getContentBinding(Class)} creates binding object which is based on
 * reflection. Although the performance is good, it can be improved by writing
 * a taylored binding by hand.
 * <p>
 * The example demonstrates how to write binding to {@link Rectangle2D}.
 *
 * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
 */
public class BindingExample {
	
	static class Rectangle2DBinding extends RecordBinding {
		
		public Rectangle2DBinding() {
			componentBindings = new Binding[4];
			componentBindings[0] = Bindings.getBindingUnchecked(Double.class);
			componentBindings[1] = Bindings.getBindingUnchecked(Double.class);
			componentBindings[2] = Bindings.getBindingUnchecked(Double.class);
			componentBindings[3] = Bindings.getBindingUnchecked(Double.class);

			type = Datatypes.getDatatypeUnchecked( Rectangle2D.Double.class );
		}

		@Override
		public Object create(Object... value) {
			return new Rectangle2D.Double((Double)value[0], (Double)value[1], (Double)value[2], (Double)value[3]);
		}

		@Override
		public Object getComponent(Object obj, int index) {
			Rectangle2D rect = (Rectangle2D) obj;
			switch (index) {
			case 0: return rect.getX();
			case 1: return rect.getY();
			case 2: return rect.getWidth();
			case 3: return rect.getHeight();
			default: throw new IllegalArgumentException("index out of range, expected 0..3, got "+index);
			}
		}

		@Override
		public Object createPartial() throws BindingException {
			return new Rectangle2D.Double();
		}

		@Override
		public void setComponents(Object obj, Object... value) {
			Rectangle2D rect = (Rectangle2D) obj;
			rect.setFrame((Double)value[0], (Double)value[1], (Double)value[2], (Double)value[3]);
		}
		
		@Override
		public void setComponent(Object obj, int index, Object value)
				throws BindingException {
			Rectangle2D rect = (Rectangle2D) obj;
			switch (index) {
			case 0: rect.setRect((Double)value, rect.getY(), rect.getWidth(), rect.getHeight()); break;
			case 1: rect.setRect(rect.getX(), (Double)value, rect.getWidth(), rect.getHeight()); break;
			case 2: rect.setRect(rect.getX(), rect.getY(), (Double)value, rect.getHeight()); break;
			case 3: rect.setRect(rect.getX(), rect.getY(), rect.getWidth(), (Double)value); break;
			default: throw new IllegalArgumentException("index out of range, expected 0..3, got "+index);
			}
		}

		@Override
		public boolean isInstance(Object obj) {
			return obj instanceof Rectangle2D;
		}
		
		@Override
		public void setDouble(Object r, int index, double x)
				throws BindingException {
			Rectangle2D.Double rect = (Rectangle2D.Double) r;
			switch (index) {
			case 0: rect.x = x; break;
			case 1: rect.y = x; break;
			case 2: rect.width = x; break;
			case 3: rect.height = x; break;
			default: throw new IllegalArgumentException("index out of range, expected 0..3, got "+index);
			}
		}
		
		@Override
		public double getDouble(Object r, int index) throws BindingException {
			Rectangle2D.Double rect = (Rectangle2D.Double) r;
			switch (index) {
			case 0: return rect.x; 
			case 1: return rect.y;
			case 2: return rect.width;
			case 3: return rect.height;
			default: throw new IllegalArgumentException("index out of range, expected 0..3, got "+index);
			}
		}
		
	}
	
	public static void main(String[] args) throws IOException, BindingException 
	{
		
		Datatype dataType = Datatypes.getDatatypeUnchecked(Rectangle2D.Double.class);
		System.out.println(dataType);
		Binding reflectionBinding = Bindings.getBindingUnchecked(Rectangle2D.Double.class);		
		Binding handWrittenBinding = new Rectangle2DBinding(); 
		
		System.out.println("Lets measure performance... (4,000,000 reads and 1,000,000 writes*4)");
		
		Rectangle2D rect = new Rectangle2D.Double(5, 5, 100, 200);
		
		for ( int i=0; i<10; i++ ) {
			long time1 = testBinding(reflectionBinding, rect);
			long time2 = testBinding(handWrittenBinding, rect);
			
			time1 = testBinding(reflectionBinding, rect);
			time2 = testBinding(handWrittenBinding, rect);
	
			System.out.println("Time of reflection based binding: "+time1+" ms");
			System.out.println("Time of Hand-Written binding: "+time2+" ms");
		}
	}
	
	static long testBinding(Binding b, Rectangle2D rect) throws BindingException
	{
		RecordBinding record = (RecordBinding) b;
		Runtime.getRuntime().gc();		
		long timeAtStart = System.currentTimeMillis();
		for (int i=0; i<10000000; i++)
		{
			record.getComponent(rect, 0); 
			record.getComponent(rect, 1); 
			record.getComponent(rect, 2); 
			record.getComponent(rect, 3);
			record.setComponents(rect, 5.0, 5.0, 100.0, 200.0);						
		}
		return System.currentTimeMillis() - timeAtStart;		
	}
	

}