Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.objmap2 / src / org / simantics / objmap / internal / MonotoneBackwardMapping.java

diff --git a/bundles/org.simantics.objmap2/src/org/simantics/objmap/internal/MonotoneBackwardMapping.java b/bundles/org.simantics.objmap2/src/org/simantics/objmap/internal/MonotoneBackwardMapping.java
new file mode 100644 (file)
index 0000000..8205d1f
--- /dev/null
+++ b/bundles/org.simantics.objmap2/src/org/simantics/objmap/internal/MonotoneBackwardMapping.java
@@ -0,0 +1,63 @@
+/*******************************************************************************\r
+ * Copyright (c) 2012, 2013 Association for Decentralized Information Management in\r
+ * 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.internal;\r
+\r
+import gnu.trove.map.hash.THashMap;\r
+\r
+import java.util.Collections;\r
+import java.util.Set;\r
+\r
+import org.simantics.db.WriteGraph;\r
+import org.simantics.objmap.backward.IBackwardLinkType;\r
+import org.simantics.objmap.backward.IBackwardMapping;\r
+import org.simantics.objmap.backward.IBackwardMappingSchema;\r
+import org.simantics.objmap.exceptions.MappingException;\r
+\r
+/**\r
+ * An unidirectional (from range to domain) mapping that does not support removals.\r
+ * \r
+ * @author Hannu Niemistö\r
+ */\r
+public class MonotoneBackwardMapping<Domain, Range> implements IBackwardMapping<Domain, Range> {\r
+\r
+    IBackwardMappingSchema<Domain, Range> schema;\r
+    THashMap<Range, Domain> map = new THashMap<Range, Domain>();\r
+    \r
+    public MonotoneBackwardMapping(IBackwardMappingSchema<Domain, Range> schema) {\r
+        this.schema = schema;\r
+    }\r
+\r
+    @Override\r
+    public Set<Range> getRange() {\r
+        return Collections.unmodifiableSet(map.keySet());\r
+    }\r
+\r
+    @Override\r
+    public Domain inverseGet(Range rangeElement) {\r
+        return map.get(rangeElement);\r
+    }\r
+\r
+    @Override\r
+    public Domain inverseMap(WriteGraph graph, Range rangeElement) throws MappingException {\r
+        Domain result = inverseGet(rangeElement);\r
+        if(result == null) {\r
+            IBackwardLinkType<Domain, Range> linkType = \r
+                    schema.linkTypeOfRangeElement(graph, rangeElement);\r
+            // Two phase creation makes cyclic references possible\r
+            Domain domainElement = linkType.createDomainElement(graph, rangeElement);\r
+            map.put(rangeElement, domainElement);\r
+            linkType.createDomain(graph, this, domainElement, rangeElement);\r
+        }\r
+        return result;\r
+    }\r
+\r
+}\r