bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/variable/ValueAccessorWithBinding.java

   1 package org.simantics.db.layer0.variable;
   2
   3 import org.simantics.databoard.Bindings;
   4 import org.simantics.databoard.adapter.AdaptException;
   5 import org.simantics.databoard.binding.Binding;
   6 import org.simantics.databoard.type.Datatype;
   7 import org.simantics.db.ReadGraph;
   8 import org.simantics.db.WriteGraph;
   9 import org.simantics.db.exception.DatabaseException;
  10
  11 /**
  12  * A default implementation of value accessor that has fixed binding.
  13  */
  14 public abstract class ValueAccessorWithBinding implements ValueAccessor {
  15
  16         public abstract Binding getBinding();
  17
  18         @Override
  19         public Object getValue(ReadGraph graph, Variable context, Binding binding)
  20                         throws DatabaseException {
  21                 try {
  22                         return Bindings.adapt(getValue(graph, context), getBinding(), binding);
  23                 } catch (AdaptException e) {
  24                         throw new DatabaseException(e);
  25                 }
  26         }
  27
  28         @Override
  29         public void setValue(WriteGraph graph, Variable context, Object value,
  30                         Binding binding) throws DatabaseException {
  31                 try {
  32                         setValue(graph, context, Bindings.adapt(value, binding, getBinding()));
  33                 } catch (AdaptException e) {
  34                         throw new DatabaseException(e);
  35                 }
  36         }
  37
  38         @Override
  39         public Datatype getDatatype(ReadGraph graph, Variable context) throws DatabaseException {
  40                 return getBinding().type();
  41         }
  42 }