Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.databoard / src / org / simantics / databoard / binding / reflection / EnumClassBinding.java

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 (file)
index 0000000..b803010
--- /dev/null
+++ b/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/reflection/EnumClassBinding.java
@@ -0,0 +1,84 @@
+/*******************************************************************************\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.binding.reflection;
+
+import org.simantics.databoard.binding.Binding;\r
+import org.simantics.databoard.binding.UnionBinding;\r
+import org.simantics.databoard.binding.error.BindingException;\r
+import org.simantics.databoard.type.UnionType;\r
+
+/**\r
+ * This class binds a java Enum-class with DataBoard's UnionType.\r
+ *\r
+ *\r
+ * @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();\r
+        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;\r
+               throw new BindingException(obj+" is not an element of "+clazz.getSimpleName());\r
+    }
+    
+    @Override
+    public Object getValue(Object obj) {
+        return obj;
+    }
+    
+    @Override
+    public boolean isInstance(Object obj) {
+        return clazz.isInstance(obj);
+    }\r
+    \r
+    @Override\r
+    public boolean isImmutable() {\r
+       return true;\r
+    }
+\r
+    @Override\r
+    protected boolean baseEquals(Object obj) {\r
+       EnumClassBinding o = (EnumClassBinding)obj;\r
+       return super.baseEquals(obj) && o.clazz.equals(clazz);\r
+    }\r
+    \r
+    @Override\r
+    public int baseHashCode() {\r
+       return super.baseHashCode() + 13 * clazz.hashCode();\r
+    }\r
+}