bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/MappingUtils.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2013 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.objmap.graph.rules.domain;\r
  13 \r
  14 import java.util.Arrays;\r
  15 import java.util.Collection;\r
  16 \r
  17 import org.apache.log4j.Logger;\r
  18 import org.simantics.db.Resource;\r
  19 import org.simantics.db.WriteGraph;\r
  20 import org.simantics.db.exception.DatabaseException;\r
  21 \r
  22 /**\r
  23  * Static utility methods for rule implementations.\r
  24  * @author Hannu Niemistö\r
  25  */\r
  26 public class MappingUtils {\r
  27 \r
  28     static Logger LOGGER = Logger.getLogger("org.simantics.objmap");\r
  29     \r
  30     /**\r
  31      * Adds and removes statements to/from the database so that <code>objects</code>\r
  32      * will be exactly the objects connected to <code>subject</code> by <code>predicate</code>.\r
  33      * Returns true if the method made modifications to the database.\r
  34      */\r
  35         public static boolean synchronizeStatements(WriteGraph g, Resource subject, Resource predicate, Resource[] objects,\r
  36                 boolean deleteExtraObjects) \r
  37                 throws DatabaseException {\r
  38                 Collection<Resource> currentObjects0 = g.getObjects(subject, predicate);\r
  39                 Resource[] currentObjects = currentObjects0.toArray(new Resource[currentObjects0.size()]);\r
  40                 \r
  41                 Arrays.sort(objects);\r
  42                 Arrays.sort(currentObjects);\r
  43                 \r
  44                 boolean modified = false;\r
  45                 int i=0, j=0;   \r
  46                 if(currentObjects.length > 0 && objects.length > 0)\r
  47                 while(true) {\r
  48                         int cmp = currentObjects[i].compareTo(objects[j]);\r
  49                         if(cmp < 0) {\r
  50                             LOGGER.info("            remove statement");\r
  51                             if(deleteExtraObjects)\r
  52                                 g.deny(currentObjects[i]);\r
  53                             else\r
  54                                 g.denyStatement(subject, predicate, currentObjects[i]);                                 \r
  55                                 modified = true;\r
  56                                 ++i;\r
  57                                 if(i >= currentObjects.length)\r
  58                                         break;\r
  59                         }\r
  60                         else if(cmp > 0) {\r
  61                             LOGGER.info("            add statement");\r
  62                                 g.claim(subject, predicate, objects[j]);\r
  63                                 modified = true;\r
  64                                 ++j;\r
  65                                 if(j >= objects.length)\r
  66                                         break;\r
  67                         }\r
  68                         else {\r
  69                                 ++i; ++j;\r
  70                                 if(i >= currentObjects.length)\r
  71                                         break;\r
  72                                 if(j >= objects.length)\r
  73                                         break;\r
  74                         }\r
  75                 }\r
  76                 while(i < currentObjects.length) {\r
  77                     if(deleteExtraObjects)\r
  78                 g.deny(currentObjects[i]);\r
  79             else\r
  80                 g.denyStatement(subject, predicate, currentObjects[i]);\r
  81                         modified = true;\r
  82                         ++i;\r
  83                 }\r
  84                 while(j < objects.length) {\r
  85                         g.claim(subject, predicate, objects[j]);\r
  86                         modified = true;\r
  87                         ++j;\r
  88                 }\r
  89                 return modified;\r
  90         }\r
  91 \r
  92 }\r