X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.modeling%2Fsrc%2Forg%2Fsimantics%2Fmodeling%2Futils%2FJoinMap.java;fp=bundles%2Forg.simantics.modeling%2Fsrc%2Forg%2Fsimantics%2Fmodeling%2Futils%2FJoinMap.java;h=d3642e0317299f45335f2a9cb4b5dcbd658210d5;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

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
index 000000000..d3642e031
--- /dev/null
+++ b/bundles/org.simantics.modeling/src/org/simantics/modeling/utils/JoinMap.java
@@ -0,0 +1,36 @@
+package org.simantics.modeling.utils;
+
+import gnu.trove.map.hash.THashMap;
+
+import org.simantics.db.Resource;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.exception.RuntimeDatabaseException;
+import org.simantics.layer0.Layer0;
+import org.simantics.scl.runtime.SCLContext;
+import org.simantics.scl.runtime.function.FunctionImpl1;
+import org.simantics.structural.stubs.StructuralResource2;
+
+public class JoinMap extends FunctionImpl1<Object, Resource> {
+
+    THashMap<Object,Resource> map = new THashMap<Object,Resource>(); 
+    
+    @Override
+    public Resource apply(Object key) {
+        Resource join = map.get(key);
+        if(join == null) {
+            try {
+                WriteGraph g = (WriteGraph)SCLContext.getCurrent().get("graph");
+                Layer0 L0 = Layer0.getInstance(g);
+                StructuralResource2 STR = StructuralResource2.getInstance(g);
+                join = g.newResource();
+                g.claim(join, L0.InstanceOf, STR.ConnectionJoin);
+                map.put(key, join);
+            } catch(DatabaseException e) {
+                throw new RuntimeDatabaseException(e);
+            }
+        }
+        return join;
+    }
+
+}