Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/MappedElementsRule.java b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/MappedElementsRule.java
new file mode 100644 (file)
index 0000000..202c9ab
--- /dev/null
+++ b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/MappedElementsRule.java
@@ -0,0 +1,82 @@
+/*******************************************************************************\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;\r
+\r
+import java.util.ArrayList;\r
+import java.util.Collection;\r
+\r
+import org.apache.log4j.Logger;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.WriteGraph;\r
+import org.simantics.objmap.backward.IBackwardMapping;\r
+import org.simantics.objmap.bidirectional.IBidirectionalMappingRule;\r
+import org.simantics.objmap.exceptions.MappingException;\r
+import org.simantics.objmap.forward.IForwardMapping;\r
+import org.simantics.objmap.graph.rules.domain.IDomainAccessor;\r
+import org.simantics.objmap.graph.rules.range.IRangeAccessor;\r
+\r
+\r
+/**\r
+ * A rule that synchronizes collection of elements between\r
+ * domain and range accessors. Elements are mapped from\r
+ * between domain and range during the synchronization.\r
+ * @author Hannu Niemistö\r
+ */\r
+public class MappedElementsRule<Domain, Range> implements IBidirectionalMappingRule<Domain, Range> {\r
+\r
+    static Logger LOGGER = Logger.getLogger("org.simantics.objmap");\r
+\r
+    IDomainAccessor<Domain,Collection<Domain>> domainAccessor;\r
+    IRangeAccessor<Range,Collection<Range>> rangeAccessor;\r
+\r
+    public MappedElementsRule(IDomainAccessor<Domain,Collection<Domain>> domainAccessor,\r
+            IRangeAccessor<Range,Collection<Range>> rangeAccessor) {\r
+        this.domainAccessor = domainAccessor;\r
+        this.rangeAccessor = rangeAccessor;\r
+    }\r
+\r
+    @Override\r
+    public boolean updateDomain(WriteGraph g, IBackwardMapping<Domain, Range> map,\r
+            Domain domainElement, Range rangeElement)\r
+    throws MappingException {\r
+        LOGGER.info("    MappedElementsRule.updateDomain");\r
+        // Snapshot the accessed range value for concurrency safety.\r
+        // NOTE: still assumes that the accessed collection is concurrent or\r
+        // synchronized for toArray to be atomic.\r
+        Collection<Range> value = rangeAccessor.get(rangeElement);\r
+        Object[] rangeSnapshot = value.toArray();\r
+        ArrayList<Domain> mappedValue = new ArrayList<Domain>(rangeSnapshot.length);\r
+        for (Object obj : rangeSnapshot)\r
+            mappedValue.add(map.inverseMap(g, (Range)obj));//map.inverseGet((Range)obj));\r
+        return domainAccessor.set(g, domainElement, mappedValue);\r
+    }\r
+\r
+    @Override\r
+    public boolean updateRange(ReadGraph g, IForwardMapping<Domain, Range> map,\r
+            Domain domainElement, Range rangeElement)\r
+    throws MappingException {\r
+        LOGGER.info("    MappedElementsRule.updateRange");\r
+        Collection<Domain> value = domainAccessor.get(g, domainElement);\r
+        ArrayList<Range> mappedValue = new ArrayList<Range>(value.size());\r
+        for(Domain r : value)\r
+            mappedValue.add(map.map(g, r));//map.get(r));\r
+        return rangeAccessor.set(rangeElement, mappedValue);\r
+    }\r
+    \r
+    public void createDomain(WriteGraph g, IBackwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {\r
+       updateDomain(g, map, domainElement, rangeElement);\r
+    };\r
+    \r
+    public void createRange(ReadGraph g, IForwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {\r
+       updateRange(g, map, domainElement, rangeElement);\r
+    };\r
+}\r