Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.common / src / org / simantics / db / common / request / MappedRelated.java

diff --git a/bundles/org.simantics.db.common/src/org/simantics/db/common/request/MappedRelated.java b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/MappedRelated.java
new file mode 100644 (file)
index 0000000..6d47c42
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+++ b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/MappedRelated.java
@@ -0,0 +1,50 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.db.common.request;\r
+\r
+import java.util.HashMap;\r
+import java.util.Map;\r
+\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.operation.Layer0X;\r
+\r
+/**\r
+ * Given an input resource that consists of resources representing other\r
+ * resources, return a map: represented resource -> representing resource.\r
+ * \r
+ * @author Antti Villberg\r
+ */\r
+public class MappedRelated extends ResourceRead2<Map<Resource, Resource>> {\r
+\r
+    public MappedRelated(Resource flat, Resource relation) {\r
+        super(flat, relation);\r
+    }\r
+\r
+    @Override\r
+    public Map<Resource, Resource> perform(ReadGraph graph) throws DatabaseException {\r
+\r
+        Layer0X L0X = Layer0X.getInstance(graph);\r
+        Map<Resource, Resource> result = new HashMap<Resource, Resource>();\r
+\r
+        for (Resource part : graph.getObjects(resource, resource2)) {\r
+            Resource represents = graph.getPossibleObject(part, L0X.Represents);\r
+            if (represents != null)\r
+                result.put(represents, part);\r
+        }\r
+\r
+        return result;\r
+\r
+    }\r
+\r
+}\r