Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/IndexedInstances.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/IndexedInstances.java
new file mode 100644 (file)
index 0000000..1177f3a
--- /dev/null
+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/IndexedInstances.java
@@ -0,0 +1,49 @@
+package org.simantics.db.layer0.request;\r
+\r
+import java.util.Collection;\r
+import java.util.Collections;\r
+import java.util.HashSet;\r
+import java.util.Map;\r
+import java.util.Set;\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
+import org.simantics.operation.Layer0X;\r
+import org.simantics.scl.runtime.function.Function;\r
+\r
+public class IndexedInstances extends ResourceRead2<Set<Resource>> {\r
+\r
+       public IndexedInstances(Resource type, Resource indexRoot) {\r
+               super(type, indexRoot);\r
+       }\r
+\r
+       @Override\r
+       public Set<Resource> perform(ReadGraph graph) throws DatabaseException {\r
+               \r
+        Layer0 L0 = Layer0.getInstance(graph);\r
+        Layer0X L0X = Layer0X.getInstance(graph);\r
+\r
+        String typeName = graph.getRelatedValue(resource, L0.HasName);\r
+\r
+        Function dependencies = graph.adapt(L0X.Dependencies, Function.class);\r
+        \r
+        Collection<Map<String, Object>> results = (Collection<Map<String, Object>>)dependencies.apply(graph, resource2, "Types:*" + typeName);\r
+        if (results == null)\r
+            return Collections.emptySet();\r
+\r
+        HashSet<Resource> result = new HashSet<Resource>(results.size());\r
+        for(Map<String, Object> entry : results) {\r
+            Resource res = (Resource)entry.get("Resource");\r
+            if(res != null) {\r
+               if (graph.isInstanceOf(res, resource))\r
+                       result.add(res);\r
+            }\r
+        }\r
+        return result;\r
+               \r
+       }\r
+\r
+}\r