Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.layer0.utils / src / org / simantics / layer0 / utils / binaryPredicates / OrderedSetElementsPredicate.java

diff --git a/bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/binaryPredicates/OrderedSetElementsPredicate.java b/bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/binaryPredicates/OrderedSetElementsPredicate.java
new file mode 100644 (file)
index 0000000..2a094ed
--- /dev/null
+++ b/bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/binaryPredicates/OrderedSetElementsPredicate.java
@@ -0,0 +1,99 @@
+/*******************************************************************************\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.layer0.utils.binaryPredicates;\r
+\r
+import java.util.ArrayList;\r
+import java.util.Collection;\r
+import java.util.Collections;\r
+\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.Statement;\r
+import org.simantics.db.WriteGraph;\r
+import org.simantics.db.common.utils.OrderedSetUtils;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.layer0.Layer0;\r
+import org.simantics.utils.datastructures.Pair;\r
+\r
+public class OrderedSetElementsPredicate extends BinaryPredicate {\r
+\r
+       public static final OrderedSetElementsPredicate INSTANCE = \r
+               new OrderedSetElementsPredicate(); \r
+       \r
+       @Override\r
+       public Collection<Resource> getObjects(ReadGraph g, Resource subject) throws DatabaseException {\r
+               Layer0 l0 = Layer0.getInstance(g);\r
+               if(g.isInstanceOf(subject, l0.OrderedSet))\r
+                       return OrderedSetUtils.toList(g, subject);\r
+               else\r
+                       return Collections.emptyList();\r
+       }\r
+\r
+       @Override\r
+       public Collection<Pair<Resource, Resource>> getStatements(ReadGraph g) {\r
+               throw new UnsupportedOperationException();\r
+       }\r
+\r
+       @Override\r
+       public Collection<Resource> getSubjects(ReadGraph g, Resource object) throws DatabaseException {\r
+               Collection<Resource> result = new ArrayList<Resource>(1);\r
+               Layer0 l0 = Layer0.getInstance(g);\r
+               for(Statement stat : g.getStatements(object, l0.IsWeaklyRelatedTo)) {\r
+                       Resource pred = stat.getPredicate();\r
+                       if(g.isInstanceOf(pred, l0.OrderedSet) && !pred.equals(object))\r
+                               result.add(pred);\r
+               }\r
+               return result;\r
+       }\r
+\r
+       @Override\r
+       public boolean has(ReadGraph g, Resource subject, Resource object) throws DatabaseException {\r
+               return OrderedSetUtils.contains(g, subject, object) &&\r
+                       g.isInstanceOf(subject, Layer0.getInstance(g).OrderedSet);\r
+       }\r
+\r
+       @Override\r
+       public boolean supportsGetObjects() {\r
+               return true;\r
+       }\r
+\r
+       @Override\r
+       public boolean supportsGetStatements() {                \r
+               return false;\r
+       }\r
+\r
+       @Override\r
+       public boolean supportsGetSubjects() {\r
+               return true;\r
+       }\r
+\r
+       @Override\r
+       public void add(WriteGraph g, Resource subject, Resource object) throws DatabaseException {\r
+               OrderedSetUtils.add(g, subject, object);\r
+       }\r
+\r
+       @Override\r
+       public void remove(WriteGraph g, Resource subject, Resource object) throws DatabaseException {\r
+               OrderedSetUtils.remove(g, subject, object);\r
+       }\r
+\r
+       @Override\r
+       public boolean supportsAdditions() {\r
+               return true;\r
+       }\r
+\r
+       @Override\r
+       public boolean supportsRemovals() {\r
+               return true;\r
+       }\r
+       \r
+}\r