bundles/org.simantics.structural2/src/org/simantics/structural2/variables/StandardProdeduralPropertyVariable.java

   1 package org.simantics.structural2.variables;
   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 import org.simantics.db.layer0.variable.StandardAssertedGraphPropertyVariable;
  11 import org.simantics.db.layer0.variable.ValueAccessor;
  12 import org.simantics.db.layer0.variable.Variable;
  13
  14 public class StandardProdeduralPropertyVariable extends StandardAssertedGraphPropertyVariable {
  15
  16         private Object defaultValue;
  17
  18         public StandardProdeduralPropertyVariable(ReadGraph graph,
  19                         StandardProceduralChildVariable parent,
  20                         StandardAssertedGraphPropertyVariable assertedVariable, Object value) throws DatabaseException {
  21                 super(graph, parent, assertedVariable.node, assertedVariable.parentResource, assertedVariable.property.predicate, assertedVariable.object);
  22
  23                 this.defaultValue = value;
  24         }
  25
  26         @Override
  27         protected ValueAccessor getValueAccessor(ReadGraph graph) throws DatabaseException {
  28                 final ValueAccessor valueAccessor = super.getValueAccessor(graph);
  29                 return new ValueAccessor() {
  30                         @Override
  31                         public void setValue(WriteGraph graph, Variable context, Object value, Binding binding) throws DatabaseException {
  32                                 valueAccessor.setValue(graph, context, value, binding);
  33                         }
  34
  35                         @Override
  36                         public void setValue(WriteGraph graph, Variable context, Object value) throws DatabaseException {
  37                                 valueAccessor.setValue(graph, context, value);
  38                         }
  39
  40                         @Override
  41                         public Object getValue(ReadGraph graph, Variable context, Binding binding) throws DatabaseException {
  42                                 if (node != null) {
  43                                         return valueAccessor.getValue(graph, context, binding);
  44                                 } else {
  45                                         if (binding.isInstance(defaultValue))
  46                                                 return defaultValue;
  47                                         else
  48                                                 try {
  49                                                         return Bindings.adapt(defaultValue, Bindings.OBJECT, binding);
  50                                                 } catch (AdaptException e) {
  51                                                         throw new DatabaseException("Failed to adapt object " + defaultValue + " to " + binding);
  52                                                 }
  53                                 }
  54                         }
  55
  56                         @Override
  57                         public Object getValue(ReadGraph graph, Variable context) throws DatabaseException {
  58                                 if (node != null) {
  59                                         return valueAccessor.getValue(graph, context);
  60                                 } else {
  61                                         return defaultValue;
  62                                 }
  63                         }
  64
  65                         @Override
  66                         public Datatype getDatatype(ReadGraph graph, Variable context) throws DatabaseException {
  67                                 return valueAccessor.getDatatype(graph, context);
  68                         }
  69                 };
  70         }
  71 }