Multiple readers and variable optimization

[simantics/platform.git] / bundles / org.simantics.modeling / src / org / simantics / modeling / ImmutableComponentVariableBuilder.java

diff --git a/bundles/org.simantics.modeling/src/org/simantics/modeling/ImmutableComponentVariableBuilder.java b/bundles/org.simantics.modeling/src/org/simantics/modeling/ImmutableComponentVariableBuilder.java
new file mode 100644 (file)
index 0000000..37c882c
--- /dev/null
+++ b/bundles/org.simantics.modeling/src/org/simantics/modeling/ImmutableComponentVariableBuilder.java
@@ -0,0 +1,31 @@
+package org.simantics.modeling;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.common.procedure.adapter.TransientCacheListener;
+import org.simantics.db.common.utils.NameUtils;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.variable.StandardGraphChildVariable;
+import org.simantics.db.layer0.variable.StandardGraphPropertyVariable;
+import org.simantics.db.layer0.variable.Variable;
+import org.simantics.db.layer0.variable.VariableBuilder;
+import org.simantics.db.layer0.variable.VariableNode;
+
+public class ImmutableComponentVariableBuilder<Node> implements VariableBuilder<Node> {
+
+       @Override
+       public Variable buildChild(ReadGraph graph, Variable parent, VariableNode<Node> node, Resource child) throws DatabaseException {
+               if(graph.isImmutable(child)) {
+                       ImmutableComponentVariableContent content = graph.syncRequest(new ImmutableComponentVariableContentRequest(child), TransientCacheListener.instance());
+                       return new ImmutableComponentVariable(parent, content);
+               } else {
+                       return new StandardGraphChildVariable(parent, node, child);
+               }
+       }
+
+       @Override
+       public Variable buildProperty(ReadGraph graph, Variable parent, VariableNode<Node> node, Resource subject, Resource predicate) throws DatabaseException {
+               return new StandardGraphPropertyVariable(graph, parent, node, subject, predicate);
+       }
+
+}