Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/RelatedObjectAccessor.java b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/RelatedObjectAccessor.java
new file mode 100644 (file)
index 0000000..91a1647
--- /dev/null
+++ b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/RelatedObjectAccessor.java
@@ -0,0 +1,71 @@
+/*******************************************************************************\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 org.apache.log4j.Logger;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.WriteGraph;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.objmap.exceptions.MappingException;\r
+\r
+/**\r
+ * Accesses a resource attached to the element by given functional relation.\r
+ * @author Hannu Niemistö\r
+ */\r
+public class RelatedObjectAccessor implements IDomainAccessor<Resource,Resource> {\r
+\r
+    static Logger LOGGER = Logger.getLogger("org.simantics.objmap");\r
+    \r
+       Resource relation;\r
+       \r
+       public RelatedObjectAccessor(Resource relation) {\r
+               this.relation = relation;\r
+       }\r
+\r
+       @Override\r
+       public Resource get(ReadGraph g, Resource element) throws MappingException {\r
+               try {\r
+                   LOGGER.info("        RelatedObjectAccessor.get");\r
+                       return g.getPossibleObject(element, relation);\r
+               } catch (DatabaseException e) {\r
+                       throw new MappingException(e);\r
+               }\r
+       }\r
+       \r
+       @Override\r
+       public boolean set(WriteGraph g, Resource element, Resource value)\r
+                       throws MappingException {\r
+               try {\r
+                   LOGGER.info("        RelatedObjectAccessor.set");\r
+                   Resource resource = g.getPossibleObject(element, relation);\r
+                       if(resource == null) {\r
+                           if(value == null)\r
+                               return false;\r
+                           g.claim(element, relation, value);\r
+                           return true;\r
+                       }\r
+                       else if(resource.equals(value))\r
+                           return false;\r
+                       else {\r
+                           g.deny(element, relation);\r
+                           if(value != null)\r
+                               g.claim(element, relation, value);\r
+                           return true;\r
+                       }\r
+               } catch (DatabaseException e) {\r
+                       throw new MappingException(e);\r
+               }\r
+               \r
+       }\r
+\r
+}\r