/*******************************************************************************
* 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.
*
* The example demonstrates how to write binding to {@link Rectangle2D}.
*
* @author Toni Kalajainen
*/
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;
}
}