--- /dev/null
+/*******************************************************************************\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.objmap.graph.rules.domain;\r
+\r
+import java.util.Arrays;\r
+import java.util.Collection;\r
+\r
+import org.apache.log4j.Logger;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.WriteGraph;\r
+import org.simantics.db.exception.DatabaseException;\r
+\r
+/**\r
+ * Static utility methods for rule implementations.\r
+ * @author Hannu Niemistö\r
+ */\r
+public class MappingUtils {\r
+\r
+ static Logger LOGGER = Logger.getLogger("org.simantics.objmap");\r
+ \r
+ /**\r
+ * Adds and removes statements to/from the database so that <code>objects</code>\r
+ * will be exactly the objects connected to <code>subject</code> by <code>predicate</code>.\r
+ * Returns true if the method made modifications to the database.\r
+ */\r
+ public static boolean synchronizeStatements(WriteGraph g, Resource subject, Resource predicate, Resource[] objects,\r
+ boolean deleteExtraObjects) \r
+ throws DatabaseException {\r
+ Collection<Resource> currentObjects0 = g.getObjects(subject, predicate);\r
+ Resource[] currentObjects = currentObjects0.toArray(new Resource[currentObjects0.size()]);\r
+ \r
+ Arrays.sort(objects);\r
+ Arrays.sort(currentObjects);\r
+ \r
+ boolean modified = false;\r
+ int i=0, j=0; \r
+ if(currentObjects.length > 0 && objects.length > 0)\r
+ while(true) {\r
+ int cmp = currentObjects[i].compareTo(objects[j]);\r
+ if(cmp < 0) {\r
+ LOGGER.info(" remove statement");\r
+ if(deleteExtraObjects)\r
+ g.deny(currentObjects[i]);\r
+ else\r
+ g.denyStatement(subject, predicate, currentObjects[i]); \r
+ modified = true;\r
+ ++i;\r
+ if(i >= currentObjects.length)\r
+ break;\r
+ }\r
+ else if(cmp > 0) {\r
+ LOGGER.info(" add statement");\r
+ g.claim(subject, predicate, objects[j]);\r
+ modified = true;\r
+ ++j;\r
+ if(j >= objects.length)\r
+ break;\r
+ }\r
+ else {\r
+ ++i; ++j;\r
+ if(i >= currentObjects.length)\r
+ break;\r
+ if(j >= objects.length)\r
+ break;\r
+ }\r
+ }\r
+ while(i < currentObjects.length) {\r
+ if(deleteExtraObjects)\r
+ g.deny(currentObjects[i]);\r
+ else\r
+ g.denyStatement(subject, predicate, currentObjects[i]);\r
+ modified = true;\r
+ ++i;\r
+ }\r
+ while(j < objects.length) {\r
+ g.claim(subject, predicate, objects[j]);\r
+ modified = true;\r
+ ++j;\r
+ }\r
+ return modified;\r
+ }\r
+\r
+}\r