Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / request / ResourceToPossibleVariable.java

diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/ResourceToPossibleVariable.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/ResourceToPossibleVariable.java
new file mode 100644 (file)
index 0000000..8738f0e
--- /dev/null
+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/ResourceToPossibleVariable.java
@@ -0,0 +1,32 @@
+package org.simantics.db.layer0.request;\r
+\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.common.request.ResourceRead;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.layer0.variable.StandardGraphChildVariable;\r
+import org.simantics.db.layer0.variable.Variable;\r
+import org.simantics.layer0.Layer0;\r
+\r
+public class ResourceToPossibleVariable extends ResourceRead<Variable> {\r
+\r
+       public ResourceToPossibleVariable(Resource resource) {\r
+               super(resource);\r
+       }\r
+       \r
+       @Override\r
+       public Variable perform(ReadGraph graph) throws DatabaseException {\r
+               \r
+               Layer0 L0 = Layer0.getInstance(graph);\r
+               Resource parent = graph.getPossibleObject(resource, L0.PartOf);\r
+               if(parent == null) {\r
+                       if(graph.getRootLibrary().equals(resource)) return new StandardGraphChildVariable(null, null, graph.getRootLibrary());\r
+                       else return null;\r
+               }\r
+               Variable parentVariable = graph.syncRequest(new ResourceToPossibleVariable(parent));\r
+               if(parentVariable == null) return null;\r
+               return parentVariable.browsePossible(graph, resource);\r
+               \r
+       }\r
+\r
+}\r