--- /dev/null
+/*******************************************************************************\r
+ * Copyright (c) 2010 Association for Decentralized Information Management in\r
+ * Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ * VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.databoard.example.old;
+
+import java.awt.geom.Rectangle2D;\r
+import java.io.IOException;\r
+\r
+import org.simantics.databoard.Bindings;\r
+import org.simantics.databoard.Datatypes;\r
+import org.simantics.databoard.binding.Binding;\r
+import org.simantics.databoard.binding.RecordBinding;\r
+import org.simantics.databoard.binding.error.BindingException;\r
+import org.simantics.databoard.type.Datatype;\r
+
+/**
+ * {@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;
+ }\r
+ \r
+ @Override\r
+ public void setDouble(Object r, int index, double x)\r
+ throws BindingException {\r
+ Rectangle2D.Double rect = (Rectangle2D.Double) r;\r
+ switch (index) {\r
+ case 0: rect.x = x; break;\r
+ case 1: rect.y = x; break;\r
+ case 2: rect.width = x; break;\r
+ case 3: rect.height = x; break;\r
+ default: throw new IllegalArgumentException("index out of range, expected 0..3, got "+index);\r
+ }\r
+ }\r
+ \r
+ @Override\r
+ public double getDouble(Object r, int index) throws BindingException {\r
+ Rectangle2D.Double rect = (Rectangle2D.Double) r;\r
+ switch (index) {\r
+ case 0: return rect.x; \r
+ case 1: return rect.y;\r
+ case 2: return rect.width;\r
+ case 3: return rect.height;\r
+ default: throw new IllegalArgumentException("index out of range, expected 0..3, got "+index);\r
+ }\r
+ }
+
+ }
+
+ 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);
+ \r
+ for ( int i=0; i<10; i++ ) {
+ long time1 = testBinding(reflectionBinding, rect);
+ long time2 = testBinding(handWrittenBinding, rect);
+
+ time1 = testBinding(reflectionBinding, rect);\r
+ time2 = testBinding(handWrittenBinding, rect);\r
+ \r
+ System.out.println("Time of reflection based binding: "+time1+" ms");
+ System.out.println("Time of Hand-Written binding: "+time2+" ms");\r
+ }
+ }
+
+ 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;
+ }
+
+
+}
+
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