Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.modeling / src / org / simantics / modeling / utils / JoinMap.java

diff --git a/bundles/org.simantics.modeling/src/org/simantics/modeling/utils/JoinMap.java b/bundles/org.simantics.modeling/src/org/simantics/modeling/utils/JoinMap.java
new file mode 100644 (file)
index 0000000..d3642e0
--- /dev/null
+++ b/bundles/org.simantics.modeling/src/org/simantics/modeling/utils/JoinMap.java
@@ -0,0 +1,36 @@
+package org.simantics.modeling.utils;\r
+\r
+import gnu.trove.map.hash.THashMap;\r
+\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.WriteGraph;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.exception.RuntimeDatabaseException;\r
+import org.simantics.layer0.Layer0;\r
+import org.simantics.scl.runtime.SCLContext;\r
+import org.simantics.scl.runtime.function.FunctionImpl1;\r
+import org.simantics.structural.stubs.StructuralResource2;\r
+\r
+public class JoinMap extends FunctionImpl1<Object, Resource> {\r
+\r
+    THashMap<Object,Resource> map = new THashMap<Object,Resource>(); \r
+    \r
+    @Override\r
+    public Resource apply(Object key) {\r
+        Resource join = map.get(key);\r
+        if(join == null) {\r
+            try {\r
+                WriteGraph g = (WriteGraph)SCLContext.getCurrent().get("graph");\r
+                Layer0 L0 = Layer0.getInstance(g);\r
+                StructuralResource2 STR = StructuralResource2.getInstance(g);\r
+                join = g.newResource();\r
+                g.claim(join, L0.InstanceOf, STR.ConnectionJoin);\r
+                map.put(key, join);\r
+            } catch(DatabaseException e) {\r
+                throw new RuntimeDatabaseException(e);\r
+            }\r
+        }\r
+        return join;\r
+    }\r
+\r
+}\r