X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.databoard%2Fsrc%2Forg%2Fsimantics%2Fdataboard%2Fbinding%2Freflection%2FEnumClassBinding.java;fp=bundles%2Forg.simantics.databoard%2Fsrc%2Forg%2Fsimantics%2Fdataboard%2Fbinding%2Freflection%2FEnumClassBinding.java;h=b8030103ae954c1d91faa24cbeb6c21959d8bfb7;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/reflection/EnumClassBinding.java b/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/reflection/EnumClassBinding.java
new file mode 100644
index 000000000..b8030103a
--- /dev/null
+++ b/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/reflection/EnumClassBinding.java
@@ -0,0 +1,84 @@
+/*******************************************************************************
+ *  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.binding.reflection;
+
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.binding.UnionBinding;
+import org.simantics.databoard.binding.error.BindingException;
+import org.simantics.databoard.type.UnionType;
+
+/**
+ * This class binds a java Enum-class with DataBoard's UnionType.
+ *
+ *
+ * @author Toni Kalajainen
+ */
+public class EnumClassBinding extends UnionBinding {
+
+    Class<Enum<?>> clazz;
+    Enum<?>[] tags;
+    
+    public EnumClassBinding(UnionType type, Class<Enum<?>> clazz) {
+        this.type = type;
+        this.tags = clazz.getEnumConstants();
+        this.clazz = clazz;
+        
+        componentBindings = new Binding[ tags.length ];
+        for (int i=0; i<tags.length; i++) {
+            componentBindings[i] = new ConstantBinding(type.components[i].type, tags[i]);
+        }
+    }
+    
+    @Override
+    public Object create(int tag, Object value) {
+        return tags[tag];
+    }
+    
+    @Override
+    public void setValue(Object union, int tag, Object value)
+	throws BindingException {
+    	throw new BindingException("Cannot change enum instance value");
+    }
+    
+    @Override
+    public int getTag(Object obj) throws BindingException {
+        for (int i=0; i<tags.length; i++)
+            if (obj==tags[i]) return i;
+		throw new BindingException(obj+" is not an element of "+clazz.getSimpleName());
+    }
+    
+    @Override
+    public Object getValue(Object obj) {
+        return obj;
+    }
+    
+    @Override
+    public boolean isInstance(Object obj) {
+        return clazz.isInstance(obj);
+    }
+    
+    @Override
+    public boolean isImmutable() {
+    	return true;
+    }
+
+    @Override
+    protected boolean baseEquals(Object obj) {
+    	EnumClassBinding o = (EnumClassBinding)obj;
+    	return super.baseEquals(obj) && o.clazz.equals(clazz);
+    }
+    
+    @Override
+    public int baseHashCode() {
+    	return super.baseHashCode() + 13 * clazz.hashCode();
+    }
+}