Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.modeling / src / org / simantics / modeling / subscription / FindSubscriptionItem.java

diff --git a/bundles/org.simantics.modeling/src/org/simantics/modeling/subscription/FindSubscriptionItem.java b/bundles/org.simantics.modeling/src/org/simantics/modeling/subscription/FindSubscriptionItem.java
new file mode 100644 (file)
index 0000000..5bca0d8
--- /dev/null
+++ b/bundles/org.simantics.modeling/src/org/simantics/modeling/subscription/FindSubscriptionItem.java
@@ -0,0 +1,74 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2011 Association for Decentralized Information Management in\r
+ * 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.modeling.subscription;\r
+\r
+import org.simantics.databoard.Databoard;\r
+import org.simantics.databoard.binding.Binding;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.common.request.UniqueRead;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.layer0.variable.RVI;\r
+import org.simantics.layer0.Layer0;\r
+import org.simantics.modeling.ModelingResources;\r
+\r
+/**\r
+ * This query finds subscription items by variable reference\r
+ * \r
+ * @author toni.kalajainen\r
+ */\r
+public class FindSubscriptionItem extends UniqueRead<Resource> {\r
+\r
+       Resource subscription;\r
+       RVI rvi;\r
+       \r
+       public FindSubscriptionItem(Resource subscription, RVI rvi) {\r
+               super();\r
+               this.subscription = subscription;\r
+               this.rvi = rvi;\r
+       }\r
+\r
+       @Override\r
+       public Resource perform(ReadGraph graph) throws DatabaseException {\r
+        Layer0 L0 = Layer0.getInstance(graph);\r
+        ModelingResources MOD = ModelingResources.getInstance(graph);\r
+\r
+       Binding rviBinding = graph.getService(Databoard.class).getBindingUnchecked( RVI.class );\r
+        for (Resource r : graph.getObjects(subscription, L0.ConsistsOf))\r
+        {\r
+               if ( !graph.isInstanceOf(r, MOD.Subscription_Item) ) continue;\r
+               \r
+               RVI _rvi = (RVI) graph.getPossibleRelatedValue(r, MOD.Subscription_Item_VariableId, rviBinding);\r
+               if (_rvi.equals(rvi)) return r;\r
+        }\r
+\r
+               return null;\r
+       }\r
+       \r
+    @Override\r
+    public int hashCode() {\r
+        return rvi.hashCode() + subscription.hashCode();\r
+    }\r
+\r
+    @Override\r
+    public boolean equals(Object object) {\r
+        if (this == object) return true;\r
+        if (object == null) return false;\r
+        if (getClass() != object.getClass()) return false;\r
+        FindSubscriptionItem r = (FindSubscriptionItem) object;\r
+        \r
+        return subscription.equals(r.subscription) && rvi.equals(r.rvi);\r
+    }\r
+       \r
+\r
+\r
+}\r