Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / genericrelation / DependenciesListenerStore.java

diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/genericrelation/DependenciesListenerStore.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/genericrelation/DependenciesListenerStore.java
new file mode 100644 (file)
index 0000000..6eb879b
--- /dev/null
+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/genericrelation/DependenciesListenerStore.java
@@ -0,0 +1,46 @@
+package org.simantics.db.layer0.genericrelation;\r
+\r
+import gnu.trove.set.hash.THashSet;\r
+\r
+import java.util.HashMap;\r
+import java.util.Map;\r
+import java.util.Set;\r
+\r
+import org.simantics.db.Resource;\r
+\r
+class DependenciesListenerStore {\r
+       \r
+       private final Map<Resource,Set<Runnable>> listeners = new HashMap<Resource,Set<Runnable>>();\r
+\r
+       public synchronized void addListener(Resource model, Runnable listener) {\r
+               Set<Runnable> list = listeners.get(model);\r
+               if(list == null) {\r
+                       list = new THashSet<Runnable>();\r
+                       listeners.put(model, list);\r
+               }\r
+               list.add(listener);\r
+               if (DependenciesRelation.DEBUG_LISTENERS) {\r
+                       System.out.println("DependenciesRelation.addListener(" + listener + "), " + listeners.size() + " total listeners");\r
+                       new Exception("DependenciesRelation.addListener(" + listener + ")").printStackTrace(System.out);\r
+               }\r
+       }\r
+\r
+       public synchronized void removeListener(Resource model, Runnable listener) {\r
+               Set<Runnable> list = listeners.get(model);\r
+               if(list == null) return;\r
+               list.remove(listener);\r
+               if (DependenciesRelation.DEBUG_LISTENERS) {\r
+                       System.out.println("DependenciesRelation.removeListener(" + listener + "), " + listeners.size() + " total listeners");\r
+                       new Exception("DependenciesRelation.removeListener(" + listener + ")").printStackTrace(System.out);\r
+               }\r
+       }\r
+\r
+       public synchronized void fireListeners(Resource model) {\r
+               Set<Runnable> list = listeners.get(model);\r
+               if(list == null) return;\r
+               for (Runnable r : list) {\r
+                       r.run();\r
+               }\r
+       }\r
+\r
+}
\ No newline at end of file