1 files changed, 68 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.app/src/org/eclipse/equinox/internal/app/SingletonContainer.java b/bundles/org.eclipse.equinox.app/src/org/eclipse/equinox/internal/app/SingletonContainer.java
new file mode 100755
index 000000000..8b61feee9
--- /dev/null
+++ b/bundles/org.eclipse.equinox.app/src/org/eclipse/equinox/internal/app/SingletonContainer.java
@@ -0,0 +1,68 @@
+/*******************************************************************************
+ * Copyright (c) 2005, 2006 IBM Corporation and others.
+ * 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:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.equinox.internal.app;
+
+import org.eclipse.equinox.app.*;
+
+public class SingletonContainer implements IContainer {
+	private EclipseAppHandle singletonHandle;
+	private String type;
+	private IContainer singletonContainer;
+	private ContainerManager containerManager;
+
+	public SingletonContainer(IContainer singletonContainer, String type, ContainerManager containerManager) {
+		this.singletonContainer = singletonContainer;
+		this.type = type;
+		this.containerManager = containerManager;
+	}
+
+	public synchronized IApplication launch(IAppContext context) throws Exception {
+		// attempt to lock this application type; an exception will be thrown if the type cannot be locked
+		lock((EclipseAppHandle) context);
+		return singletonContainer.launch(context);
+	}
+
+	public boolean isSingletonContainer() {
+		return true;
+	}
+
+	synchronized boolean isLocked() {
+		return singletonHandle != null;
+	}
+
+	synchronized void lock(EclipseAppHandle appHandle) {
+		if (singletonHandle != null)
+			throw new IllegalStateException("Only one application of type \"" + type + "\" is allowed to run at a time");
+		singletonHandle = appHandle;
+		refreshAppDescriptors();
+	}
+
+	synchronized void unlock() {
+		singletonHandle = null;
+		refreshAppDescriptors();
+	}
+
+	private void refreshAppDescriptors() {
+		EclipseAppDescriptor[] singletonApps = containerManager.getAppDescriptorsByType(type);
+		for (int i = 0; i < singletonApps.length; i++) {
+			singletonApps[i].setSingletonMgr(this);
+			singletonApps[i].refreshProperties();
+		}
+	}
+
+	public void shutdown() {
+		singletonContainer.shutdown();
+	}
+
+	IContainer getContainer() {
+		return singletonContainer;
+	}
+}