X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.db.layer0%2Fsrc%2Forg%2Fsimantics%2Fdb%2Flayer0%2Frequest%2FIsLinkedTo.java;fp=bundles%2Forg.simantics.db.layer0%2Fsrc%2Forg%2Fsimantics%2Fdb%2Flayer0%2Frequest%2FIsLinkedTo.java;h=cd108e9abf03e088ecaee3c9f0848715a88ac516;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

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
index 000000000..cd108e9ab
--- /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;
+
+import java.util.Collection;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.common.request.ResourceRead2;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.layer0.Layer0;
+
+public class IsLinkedTo extends ResourceRead2<Boolean> {
+
+	public IsLinkedTo(Resource resource, Resource resource2) {
+		super(resource, resource2);
+	}
+
+	@Override
+	public Boolean perform(ReadGraph graph) throws DatabaseException {
+		if(resource.equals(resource2)) return true;
+		Layer0 L0 = Layer0.getInstance(graph);
+		Collection<Resource> links = graph.getObjects(resource, L0.IsLinkedTo);
+		for(Resource link : links) {
+			if(link.equals(resource2)) return true;
+		}
+		for(Resource link : links) {
+			if(graph.syncRequest(new IsLinkedTo(link, resource2))) return true;
+		}
+		return false;
+	}
+
+}