Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.objmap2 / src / org / simantics / objmap / graph / rules / domain / MappingUtils.java

diff --git a/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/MappingUtils.java b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/MappingUtils.java
new file mode 100644 (file)
index 0000000..5e97f85
--- /dev/null
+++ b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/MappingUtils.java
@@ -0,0 +1,92 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2013 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