Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.mapping / src / org / simantics / mapping / constraint / instructions / TripletSubjectPredicateQuery.java

diff --git a/bundles/org.simantics.mapping/src/org/simantics/mapping/constraint/instructions/TripletSubjectPredicateQuery.java b/bundles/org.simantics.mapping/src/org/simantics/mapping/constraint/instructions/TripletSubjectPredicateQuery.java
new file mode 100644 (file)
index 0000000..130549c
--- /dev/null
+++ b/bundles/org.simantics.mapping/src/org/simantics/mapping/constraint/instructions/TripletSubjectPredicateQuery.java
@@ -0,0 +1,84 @@
+/*******************************************************************************\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.mapping.constraint.instructions;\r
+\r
+import gnu.trove.set.hash.TIntHashSet;\r
+\r
+import java.util.Collection;\r
+import java.util.Iterator;\r
+\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.Statement;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.layer0.Layer0;\r
+\r
+public class TripletSubjectPredicateQuery extends TripletInstruction {\r
+\r
+       Resource predicate;\r
+       \r
+       public TripletSubjectPredicateQuery(int variable0, int variable1, int variable2,\r
+                       Resource predicate) {\r
+               super(variable0, variable1, variable2);\r
+               this.predicate = predicate;\r
+       }\r
+       \r
+       public TripletSubjectPredicateQuery(int variable0, int variable1, int variable2) {\r
+               this(variable0, variable1, variable2, null);\r
+       }\r
+       \r
+       @Override\r
+       public Object query(ReadGraph g, Object[] bindings) throws DatabaseException {\r
+               Resource r2 = (Resource)bindings[variable2];\r
+//             ITask task = ThreadLogger.getInstance().begin("g");\r
+               Collection<Statement> result =\r
+                       predicate == null \r
+                       ? g.getStatements(r2, Layer0.getInstance(g).IsWeaklyRelatedTo)\r
+                               : g.getStatements(r2, g.getInverse(predicate));\r
+//             task.finish();\r
+               if(result.isEmpty())\r
+                       return IInstruction.FAILURE;\r
+               Iterator<Statement> it = result.iterator();\r
+               Statement stat = it.next();\r
+               bindings[variable1] = g.getInverse(stat.getPredicate());\r
+               bindings[variable0] = stat.getObject();\r
+               if(it.hasNext())\r
+                       return it;\r
+               else\r
+                       return null;\r
+       }\r
+       \r
+       @SuppressWarnings("unchecked")\r
+       @Override\r
+       public Object next(ReadGraph g, Object[] bindings, Object continuation) throws DatabaseException {\r
+               Iterator<Statement> it = (Iterator<Statement>)continuation;\r
+               if(it.hasNext()) {\r
+                       Statement stat = it.next();\r
+                       bindings[variable1] = g.getInverse(stat.getPredicate());\r
+                       bindings[variable0] = stat.getObject();\r
+                       if(it.hasNext())\r
+                               return it;\r
+                       else\r
+                               return null;\r
+               }\r
+               else\r
+                       return IInstruction.FAILURE;\r
+       }       \r
+       \r
+       @Override\r
+       public void collectVariables(TIntHashSet reads, TIntHashSet writes) {           \r
+               super.collectVariables(reads, writes);\r
+               writes.add(variable0);\r
+               writes.add(variable1);\r
+       }\r
+\r
+}\r