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

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