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

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