bundles/org.simantics.databoard/examples/org/simantics/databoard/example/old/BindingExample.java

   1 /*******************************************************************************
   2  *  Copyright (c) 2010 Association for Decentralized Information Management in
   3  *  Industry THTH ry.
   4  *  All rights reserved. This program and the accompanying materials
   5  *  are made available under the terms of the Eclipse Public License v1.0
   6  *  which accompanies this distribution, and is available at
   7  *  http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  *  Contributors:
  10  *      VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.databoard.example.old;
  13
  14 import java.awt.geom.Rectangle2D;
  15 import java.io.IOException;
  16
  17 import org.simantics.databoard.Bindings;
  18 import org.simantics.databoard.Datatypes;
  19 import org.simantics.databoard.binding.Binding;
  20 import org.simantics.databoard.binding.RecordBinding;
  21 import org.simantics.databoard.binding.error.BindingException;
  22 import org.simantics.databoard.type.Datatype;
  23
  24 /**
  25  * {@link Binding} is a link between an instance and a {@link Datatype}.
  26  * {@link Datatypes#getContentBinding(Class)} creates binding object which is based on
  27  * reflection. Although the performance is good, it can be improved by writing
  28  * a taylored binding by hand.
  29  * <p>
  30  * The example demonstrates how to write binding to {@link Rectangle2D}.
  31  *
  32  * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
  33  */
  34 public class BindingExample {
  35
  36         static class Rectangle2DBinding extends RecordBinding {
  37
  38                 public Rectangle2DBinding() {
  39                         componentBindings = new Binding[4];
  40                         componentBindings[0] = Bindings.getBindingUnchecked(Double.class);
  41                         componentBindings[1] = Bindings.getBindingUnchecked(Double.class);
  42                         componentBindings[2] = Bindings.getBindingUnchecked(Double.class);
  43                         componentBindings[3] = Bindings.getBindingUnchecked(Double.class);
  44
  45                         type = Datatypes.getDatatypeUnchecked( Rectangle2D.Double.class );
  46                 }
  47
  48                 @Override
  49                 public Object create(Object... value) {
  50                         return new Rectangle2D.Double((Double)value[0], (Double)value[1], (Double)value[2], (Double)value[3]);
  51                 }
  52
  53                 @Override
  54                 public Object getComponent(Object obj, int index) {
  55                         Rectangle2D rect = (Rectangle2D) obj;
  56                         switch (index) {
  57                         case 0: return rect.getX();
  58                         case 1: return rect.getY();
  59                         case 2: return rect.getWidth();
  60                         case 3: return rect.getHeight();
  61                         default: throw new IllegalArgumentException("index out of range, expected 0..3, got "+index);
  62                         }
  63                 }
  64
  65                 @Override
  66                 public Object createPartial() throws BindingException {
  67                         return new Rectangle2D.Double();
  68                 }
  69
  70                 @Override
  71                 public void setComponents(Object obj, Object... value) {
  72                         Rectangle2D rect = (Rectangle2D) obj;
  73                         rect.setFrame((Double)value[0], (Double)value[1], (Double)value[2], (Double)value[3]);
  74                 }
  75
  76                 @Override
  77                 public void setComponent(Object obj, int index, Object value)
  78                                 throws BindingException {
  79                         Rectangle2D rect = (Rectangle2D) obj;
  80                         switch (index) {
  81                         case 0: rect.setRect((Double)value, rect.getY(), rect.getWidth(), rect.getHeight()); break;
  82                         case 1: rect.setRect(rect.getX(), (Double)value, rect.getWidth(), rect.getHeight()); break;
  83                         case 2: rect.setRect(rect.getX(), rect.getY(), (Double)value, rect.getHeight()); break;
  84                         case 3: rect.setRect(rect.getX(), rect.getY(), rect.getWidth(), (Double)value); break;
  85                         default: throw new IllegalArgumentException("index out of range, expected 0..3, got "+index);
  86                         }
  87                 }
  88
  89                 @Override
  90                 public boolean isInstance(Object obj) {
  91                         return obj instanceof Rectangle2D;
  92                 }
  93
  94                 @Override
  95                 public void setDouble(Object r, int index, double x)
  96                                 throws BindingException {
  97                         Rectangle2D.Double rect = (Rectangle2D.Double) r;
  98                         switch (index) {
  99                         case 0: rect.x = x; break;
 100                         case 1: rect.y = x; break;
 101                         case 2: rect.width = x; break;
 102                         case 3: rect.height = x; break;
 103                         default: throw new IllegalArgumentException("index out of range, expected 0..3, got "+index);
 104                         }
 105                 }
 106
 107                 @Override
 108                 public double getDouble(Object r, int index) throws BindingException {
 109                         Rectangle2D.Double rect = (Rectangle2D.Double) r;
 110                         switch (index) {
 111                         case 0: return rect.x;
 112                         case 1: return rect.y;
 113                         case 2: return rect.width;
 114                         case 3: return rect.height;
 115                         default: throw new IllegalArgumentException("index out of range, expected 0..3, got "+index);
 116                         }
 117                 }
 118
 119         }
 120
 121         public static void main(String[] args) throws IOException, BindingException
 122         {
 123
 124                 Datatype dataType = Datatypes.getDatatypeUnchecked(Rectangle2D.Double.class);
 125                 System.out.println(dataType);
 126                 Binding reflectionBinding = Bindings.getBindingUnchecked(Rectangle2D.Double.class);
 127                 Binding handWrittenBinding = new Rectangle2DBinding();
 128
 129                 System.out.println("Lets measure performance... (4,000,000 reads and 1,000,000 writes*4)");
 130
 131                 Rectangle2D rect = new Rectangle2D.Double(5, 5, 100, 200);
 132
 133                 for ( int i=0; i<10; i++ ) {
 134                         long time1 = testBinding(reflectionBinding, rect);
 135                         long time2 = testBinding(handWrittenBinding, rect);
 136
 137                         time1 = testBinding(reflectionBinding, rect);
 138                         time2 = testBinding(handWrittenBinding, rect);
 139
 140                         System.out.println("Time of reflection based binding: "+time1+" ms");
 141                         System.out.println("Time of Hand-Written binding: "+time2+" ms");
 142                 }
 143         }
 144
 145         static long testBinding(Binding b, Rectangle2D rect) throws BindingException
 146         {
 147                 RecordBinding record = (RecordBinding) b;
 148                 Runtime.getRuntime().gc();
 149                 long timeAtStart = System.currentTimeMillis();
 150                 for (int i=0; i<10000000; i++)
 151                 {
 152                         record.getComponent(rect, 0);
 153                         record.getComponent(rect, 1);
 154                         record.getComponent(rect, 2);
 155                         record.getComponent(rect, 3);
 156                         record.setComponents(rect, 5.0, 5.0, 100.0, 200.0);
 157                 }
 158                 return System.currentTimeMillis() - timeAtStart;
 159         }
 160
 161
 162 }
 163