Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.management / src / org / simantics / db / management / SessionContextProvider.java

diff --git a/bundles/org.simantics.db.management/src/org/simantics/db/management/SessionContextProvider.java b/bundles/org.simantics.db.management/src/org/simantics/db/management/SessionContextProvider.java
new file mode 100644 (file)
index 0000000..421c911
--- /dev/null
+++ b/bundles/org.simantics.db.management/src/org/simantics/db/management/SessionContextProvider.java
@@ -0,0 +1,82 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2011 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.db.management;\r
+\r
+import org.eclipse.core.runtime.ListenerList;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class SessionContextProvider implements ISessionContextProvider {\r
+\r
+    private ListenerList    listeners = new ListenerList();\r
+    \r
+    private Object          handle;\r
+\r
+    private ISessionContext context;\r
+    \r
+    public SessionContextProvider(Object handle) {\r
+        this.handle = handle;\r
+    }\r
+    \r
+    public Object getHandle() {\r
+        return handle;\r
+    }\r
+\r
+    public void setHandle(Object handle) {\r
+        this.handle = handle;\r
+    }\r
+\r
+    @Override\r
+    public void addContextChangedListener(ISessionContextChangedListener listener) {\r
+        listeners.add(listener);\r
+    }\r
+\r
+    @Override\r
+    public ISessionContext getSessionContext() {\r
+        return context;\r
+    }\r
+\r
+    @Override\r
+    public void removeContextChangedListener(ISessionContextChangedListener listener) {\r
+        listeners.remove(listener);\r
+    }\r
+\r
+    private boolean safeEquals(Object o1, Object o2) {\r
+        if (o1 == null)\r
+            return o2 == null;\r
+        return o1.equals(o2);\r
+    }\r
+    \r
+    @Override\r
+    public ISessionContext setSessionContext(ISessionContext context) {\r
+        ISessionContext oldContext = this.context;\r
+        this.context = context;\r
+\r
+        if (!safeEquals(oldContext, context))\r
+            fireChanged(oldContext, context);\r
+\r
+        return oldContext;\r
+    }\r
+\r
+    protected void fireChanged(ISessionContext oldValue, ISessionContext newValue) {\r
+        SessionContextChangedEvent event = new SessionContextChangedEvent(this, handle, oldValue, newValue);\r
+        for (Object o : listeners.getListeners())\r
+            ((ISessionContextChangedListener) o).sessionContextChanged(event);\r
+    }\r
+\r
+    @Override\r
+    public String toString() {\r
+        return "SessionContextProvider [handle=" + handle + ", context=" + context + "]";\r
+    }\r
+\r
+}\r