ListIndexRoots request

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

diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/ListIndexRoots.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/ListIndexRoots.java
new file mode 100644 (file)
index 0000000..235de05
--- /dev/null
+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/ListIndexRoots.java
@@ -0,0 +1,26 @@
+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.SingletonRead;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.util.Layer0Utils;
+
+/**
+ * Returns a set of index roots.
+ * 
+ * @author Antti Villberg
+ */
+public class ListIndexRoots extends SingletonRead<Collection<Resource>> {
+
+    public ListIndexRoots() {
+    }
+
+    @Override
+    public Collection<Resource> perform(ReadGraph graph) throws DatabaseException {
+       return Layer0Utils.listIndexRoots(graph);
+    }
+
+}