Support for linked lists in objmap2.

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

diff --git a/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/LinkedListAccessor.java b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/LinkedListAccessor.java
new file mode 100644 (file)
index 0000000..efdaab5
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+++ b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/LinkedListAccessor.java
@@ -0,0 +1,67 @@
+/*******************************************************************************
+ * Copyright (c) 2019 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Semantum oy - initial API and implementation
+ *******************************************************************************/
+package org.simantics.objmap.graph.rules.domain;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.common.utils.ListUtils;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.objmap.exceptions.MappingException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Accesses the set of objects attached to the element by the given relation.
+ * @author Hannu Niemistö
+ */
+public class LinkedListAccessor implements IDomainAccessor<Resource,Collection<Resource>> {
+
+       static Logger LOGGER = LoggerFactory.getLogger(LinkedListAccessor.class);
+
+       Resource relation;
+       Resource listType;
+       boolean deleteExtraObjects;
+
+       public LinkedListAccessor(Resource relation, Resource listType, boolean deleteExtraObjects) {
+               super();
+               this.relation = relation;
+               this.listType = listType;
+               this.deleteExtraObjects = deleteExtraObjects;
+       }
+
+       @Override
+       public Collection<Resource> get(ReadGraph g, Resource element) throws MappingException {
+               try {
+                       LOGGER.info("        LinkdedListAccessor.get");
+                       return ListUtils.toList(g, g.getPossibleObject(element, relation));
+               } catch (DatabaseException e) {
+                       throw new MappingException(e);
+               }
+       }
+
+       @Override
+       public boolean set(WriteGraph g, Resource element, Collection<Resource> value)
+                       throws MappingException {
+               try {
+                       LOGGER.info("        LinkdedListAccessor.set");
+                       return MappingUtils.synchronizeList(g, element, relation, listType, new ArrayList<Resource>(value), deleteExtraObjects);
+               } catch (DatabaseException e) {
+                       throw new MappingException(e);
+               }
+
+       }
+
+}