X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.db.common%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fcommon%2Frequest%2FIndexRoots.java;fp=bundles%2Forg.simantics.db.common%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fcommon%2Frequest%2FIndexRoots.java;h=e7ea43a9a7549115494f7f42df1eeaab7ace6fec;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.db.common/src/org/simantics/db/common/request/IndexRoots.java b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/IndexRoots.java
new file mode 100644
index 000000000..e7ea43a9a
--- /dev/null
+++ b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/IndexRoots.java
@@ -0,0 +1,31 @@
+package org.simantics.db.common.request;
+
+import java.util.Collection;
+import java.util.Collections;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.ResourceSet;
+import org.simantics.db.common.procedure.adapter.TransientCacheAsyncListener;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.service.CollectionSupport;
+import org.simantics.layer0.Layer0;
+
+public class IndexRoots extends ResourceRead<Collection<Resource>> {
+
+	public IndexRoots(Resource r) {
+		super(r);
+	}
+
+	@Override
+	public Collection<Resource> perform(ReadGraph graph) throws DatabaseException {
+		Layer0 L0 = Layer0.getInstance(graph);
+		if (graph.isInstanceOf(resource, L0.IndexRoot))
+			return Collections.singletonList(resource);
+		CollectionSupport cs = graph.getService(CollectionSupport.class);
+		ResourceSet types = cs.getResourceSet(graph, L0.IndexRoot);
+		ResourceSetGraph rsg = graph.syncRequest(new DependentInstances3(resource), TransientCacheAsyncListener.<ResourceSetGraph>instance());
+		return rsg.resolve(graph, types);
+	}
+
+}
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