Variable optimizations for documents (Simupedia)

[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / adapter / ReflectionComputationalValue.java

diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/adapter/ReflectionComputationalValue.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/adapter/ReflectionComputationalValue.java
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+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/adapter/ReflectionComputationalValue.java
@@ -0,0 +1,39 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Association for Decentralized Information Management in
+ * Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.layer0.adapter;
+
+import org.simantics.db.ComputationalValue;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.scl.reflection.ReflectionUtils;
+import org.simantics.scl.reflection.ValueNotFoundException;
+
+/**
+ * @author Antti Villberg
+ * @since 1.36.0
+ */
+public class ReflectionComputationalValue implements ComputationalValue {
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public <T> T getValue(ReadGraph graph, Resource resource) throws DatabaseException {
+        try {
+            return (T)ReflectionUtils.getValue(graph.getURI(resource)).getValue();
+        } catch(ValueNotFoundException e) {
+            throw new DatabaseException(e);
+        } catch(ClassCastException e) {
+            throw new DatabaseException(e);
+        }
+    }
+
+}