X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.db.management%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fmanagement%2FSessionContextProvider.java;fp=bundles%2Forg.simantics.db.management%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fmanagement%2FSessionContextProvider.java;h=421c911da053a77e83624d9906aebac4750ee83d;hp=0000000000000000000000000000000000000000;hb=969bd23cab98a79ca9101af33334000879fb60c5;hpb=866dba5cd5a3929bbeae85991796acb212338a08

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
index 000000000..421c911da
--- /dev/null
+++ b/bundles/org.simantics.db.management/src/org/simantics/db/management/SessionContextProvider.java
@@ -0,0 +1,82 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2011 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.management;
+
+import org.eclipse.core.runtime.ListenerList;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public class SessionContextProvider implements ISessionContextProvider {
+
+    private ListenerList    listeners = new ListenerList();
+    
+    private Object          handle;
+
+    private ISessionContext context;
+    
+    public SessionContextProvider(Object handle) {
+        this.handle = handle;
+    }
+    
+    public Object getHandle() {
+        return handle;
+    }
+
+    public void setHandle(Object handle) {
+        this.handle = handle;
+    }
+
+    @Override
+    public void addContextChangedListener(ISessionContextChangedListener listener) {
+        listeners.add(listener);
+    }
+
+    @Override
+    public ISessionContext getSessionContext() {
+        return context;
+    }
+
+    @Override
+    public void removeContextChangedListener(ISessionContextChangedListener listener) {
+        listeners.remove(listener);
+    }
+
+    private boolean safeEquals(Object o1, Object o2) {
+        if (o1 == null)
+            return o2 == null;
+        return o1.equals(o2);
+    }
+    
+    @Override
+    public ISessionContext setSessionContext(ISessionContext context) {
+        ISessionContext oldContext = this.context;
+        this.context = context;
+
+        if (!safeEquals(oldContext, context))
+            fireChanged(oldContext, context);
+
+        return oldContext;
+    }
+
+    protected void fireChanged(ISessionContext oldValue, ISessionContext newValue) {
+        SessionContextChangedEvent event = new SessionContextChangedEvent(this, handle, oldValue, newValue);
+        for (Object o : listeners.getListeners())
+            ((ISessionContextChangedListener) o).sessionContextChanged(event);
+    }
+
+    @Override
+    public String toString() {
+        return "SessionContextProvider [handle=" + handle + ", context=" + context + "]";
+    }
+
+}