Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.mapping/src/org/simantics/mapping/constraint/instructions/BinaryPredicateObjectQuery.java b/bundles/org.simantics.mapping/src/org/simantics/mapping/constraint/instructions/BinaryPredicateObjectQuery.java
new file mode 100644 (file)
index 0000000..db728e2
--- /dev/null
+++ b/bundles/org.simantics.mapping/src/org/simantics/mapping/constraint/instructions/BinaryPredicateObjectQuery.java
@@ -0,0 +1,75 @@
+/*******************************************************************************\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.common.utils.NameUtils;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.layer0.utils.binaryPredicates.IBinaryPredicate;\r
+\r
+public class BinaryPredicateObjectQuery extends BinaryPredicateInstruction {\r
+       \r
+       public BinaryPredicateObjectQuery(int variable0, int variable1,\r
+                       IBinaryPredicate predicate) {\r
+               super(variable0, variable1, predicate);\r
+       }\r
+\r
+       @Override\r
+       public Object query(ReadGraph g, Object[] bindings) throws DatabaseException {          \r
+               Resource r0 = (Resource)bindings[variable0];\r
+//             ITask task = ThreadLogger.getInstance().begin("g");\r
+               Collection<Resource> result = predicate.getObjects(g, r0);\r
+               if(DEBUG) {\r
+               System.out.println("getObjects(" +\r
+                       NameUtils.getSafeName(g, r0) + ", " +\r
+                       predicate.toString(g) + ") returned " + result.size() + " objects"                      \r
+                       );\r
+               }\r
+//             task.finish();\r
+               if(result.isEmpty())\r
+                       return IInstruction.FAILURE;\r
+               Iterator<Resource> it = result.iterator();\r
+               bindings[variable1] = it.next();\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) {\r
+               Iterator<Resource> it = (Iterator<Resource>)continuation;\r
+               if(it.hasNext()) {\r
+                       bindings[variable1] = it.next();\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(variable1);\r
+       }\r
+\r
+}\r