Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/IsLinkedTo.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/IsLinkedTo.java
new file mode 100644 (file)
index 0000000..cd108e9
--- /dev/null
+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/IsLinkedTo.java
@@ -0,0 +1,31 @@
+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.ResourceRead2;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.layer0.Layer0;\r
+\r
+public class IsLinkedTo extends ResourceRead2<Boolean> {\r
+\r
+       public IsLinkedTo(Resource resource, Resource resource2) {\r
+               super(resource, resource2);\r
+       }\r
+\r
+       @Override\r
+       public Boolean perform(ReadGraph graph) throws DatabaseException {\r
+               if(resource.equals(resource2)) return true;\r
+               Layer0 L0 = Layer0.getInstance(graph);\r
+               Collection<Resource> links = graph.getObjects(resource, L0.IsLinkedTo);\r
+               for(Resource link : links) {\r
+                       if(link.equals(resource2)) return true;\r
+               }\r
+               for(Resource link : links) {\r
+                       if(graph.syncRequest(new IsLinkedTo(link, resource2))) return true;\r
+               }\r
+               return false;\r
+       }\r
+\r
+}\r