bundles/org.simantics.databoard/src/org/simantics/databoard/binding/mutable/UnionTaggedObjectBinding.java

   1 package org.simantics.databoard.binding.mutable;\r
   2 \r
   3 import org.simantics.databoard.binding.Binding;\r
   4 import org.simantics.databoard.binding.UnionBinding;\r
   5 import org.simantics.databoard.binding.error.BindingException;\r
   6 import org.simantics.databoard.type.UnionType;\r
   7 \r
   8 /**\r
   9  * Binds UnionType to TaggedObject.class\r
  10  *\r
  11  * @author Toni Kalajainen <toni.kalajainen@vtt.fi>\r
  12  */\r
  13 public class UnionTaggedObjectBinding extends UnionBinding {\r
  14 \r
  15         public UnionTaggedObjectBinding(UnionType type, Binding[] componentBindings)\r
  16         {\r
  17                 this.componentBindings = componentBindings;\r
  18         if (type==null) throw new IllegalArgumentException("null arg");\r
  19                 this.type = type;\r
  20         }\r
  21 \r
  22         @Override\r
  23         public Object create(int tag, Object value) {\r
  24                 TaggedObject result = new TaggedObject();\r
  25                 result.tag = tag;\r
  26                 result.value = value;\r
  27                 return result;\r
  28         }\r
  29         \r
  30         @Override\r
  31         public void setValue(Object union, int tag, Object value)\r
  32         throws BindingException {\r
  33                 TaggedObject result = (TaggedObject)union;\r
  34                 result.tag = tag;\r
  35                 result.value = value;\r
  36         }\r
  37 \r
  38         @Override\r
  39         public int getTag(Object obj) throws BindingException {\r
  40                 if (!isInstance(obj)) throw new BindingException("Unexpected class "+obj.getClass().getSimpleName()+", TaggedObject expected");\r
  41                 TaggedObject to = (TaggedObject) obj;\r
  42                 return to.tag;\r
  43         }\r
  44 \r
  45         @Override\r
  46         public Object getValue(Object obj) throws BindingException {\r
  47                 if (!isInstance(obj)) throw new BindingException("Unexpected class "+obj.getClass().getSimpleName()+", TaggedObject expected");\r
  48                 TaggedObject to = (TaggedObject) obj;\r
  49                 return to.value;\r
  50         }\r
  51 \r
  52         @Override\r
  53         public boolean isInstance(Object obj) {\r
  54                 return obj instanceof TaggedObject;\r
  55         }\r
  56         \r
  57 }\r