Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/PossibleActiveModel.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/PossibleActiveModel.java
new file mode 100644 (file)
index 0000000..44d6ac1
--- /dev/null
+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/PossibleActiveModel.java
@@ -0,0 +1,28 @@
+package org.simantics.db.layer0.request;\r
+\r
+import java.util.Collection;\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
+\r
+/**\r
+ * Returns the active model or null if no single active model is available.\r
+ */\r
+public class PossibleActiveModel extends ResourceRead<Resource> {\r
+\r
+    public PossibleActiveModel(Resource project) {\r
+        super(project);\r
+    }\r
+\r
+    @Override\r
+    public Resource perform(ReadGraph graph) throws DatabaseException {\r
+        Collection<Resource> actives = graph.syncRequest(new ActiveModels(resource));\r
+        if (actives.size() == 1)\r
+            return actives.iterator().next();\r
+        else\r
+            return null;\r
+    }\r
+\r
+}\r