--- /dev/null
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 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.ui.workbench.editor;\r
+\r
+import java.lang.ref.WeakReference;\r
+import java.util.WeakHashMap;\r
+\r
+/**\r
+ * A class for holding a set of (Object, ResourceEditorAdapter) bindings. These\r
+ * bindings are used to store the latest editor opened for input objects. This\r
+ * is used by the default UI double click actions.\r
+ * \r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class EditorMappingImpl implements EditorMapping {\r
+\r
+ /**\r
+ * Prevent the map from holding on to resource editor adapters.\r
+ */\r
+ WeakHashMap<Object, WeakReference<EditorAdapter>> resourceToAdapter = new WeakHashMap<Object, WeakReference<EditorAdapter>>();\r
+\r
+ @Override\r
+ public synchronized void put(Object o, EditorAdapter adapter) {\r
+ assert o != null;\r
+ if (adapter != null) {\r
+ resourceToAdapter.put(o, new WeakReference<EditorAdapter>(adapter));\r
+ } else {\r
+ resourceToAdapter.remove(o);\r
+ }\r
+ }\r
+\r
+ @Override\r
+ public synchronized EditorAdapter get(Object o) {\r
+ //System.out.println("EditorMapping.get(" + o + "): key set=" + resourceToAdapter.keySet());\r
+ WeakReference<EditorAdapter> ref = resourceToAdapter.get(o);\r
+ if (ref == null)\r
+ return null;\r
+ EditorAdapter adapter = ref.get();\r
+ if (adapter == null) {\r
+ resourceToAdapter.remove(o);\r
+ return null;\r
+ }\r
+ return adapter;\r
+ }\r
+\r
+ @Override\r
+ public synchronized void clear() {\r
+ resourceToAdapter.clear();\r
+ }\r
+\r
+}\r