bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/variable/ConstantValueStandardGraphPropertyVariable.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.Resource;
   9 import org.simantics.db.WriteGraph;
  10 import org.simantics.db.exception.DatabaseException;
  11
  12 public class ConstantValueStandardGraphPropertyVariable extends StandardGraphPropertyVariable {
  13
  14         final private Object value;
  15         final private Datatype datatype;
  16
  17         public ConstantValueStandardGraphPropertyVariable(ReadGraph graph, Variable parent, Resource parentResource, Resource predicate, Object value, Datatype datatype) throws DatabaseException {
  18                 super(graph, parent, null, parentResource, predicate);
  19                 this.value = value;
  20                 this.datatype = datatype;
  21         }
  22
  23         @SuppressWarnings("unchecked")
  24         @Override
  25         public <T> T getValue(ReadGraph graph) throws DatabaseException {
  26                 return (T)value;
  27         }
  28
  29         @SuppressWarnings("unchecked")
  30         @Override
  31         public <T> T getValue(ReadGraph graph, Binding binding) throws DatabaseException {
  32                 try {
  33                         return (T)Bindings.adapt(value, Bindings.getBinding(datatype), binding);
  34                 } catch (AdaptException e) {
  35                         throw new DatabaseException(e);
  36                 }
  37         }
  38
  39         @Override
  40         public Datatype getDatatype(ReadGraph graph) throws DatabaseException {
  41                 return datatype;
  42         }
  43
  44         @Override
  45         public void setValue(WriteGraph graph, Object value) throws DatabaseException {
  46                 throw new DatabaseException("setValue is not supported.");
  47         }
  48
  49         @Override
  50         public void setValue(WriteGraph graph, Object value, Binding binding) throws DatabaseException {
  51                 throw new DatabaseException("setValue is not supported.");
  52         }
  53
  54 }