add reload menu and toolbar item

plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/handlers/ReloadHandler.java

@@ -0,0 +1,42 @@
+/*******************************************************************************
+ * Copyright (c) 2015 MINRES Technologies GmbH 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:
+ *     MINRES Technologies GmbH - initial API and implementation
+ *******************************************************************************/
+package com.minres.scviewer.e4.application.handlers;
+
+import org.eclipse.e4.core.di.annotations.CanExecute;
+import org.eclipse.e4.core.di.annotations.Execute;
+import org.eclipse.e4.ui.model.application.MApplication;
+import org.eclipse.e4.ui.model.application.ui.basic.MPart;
+import org.eclipse.e4.ui.workbench.modeling.EModelService;
+import org.eclipse.e4.ui.workbench.modeling.EPartService;
+import org.eclipse.swt.widgets.Shell;
+
+import com.minres.scviewer.e4.application.parts.WaveformViewer;
+public class ReloadHandler {
+
+	@CanExecute
+	public boolean canExecute(EPartService partService) {
+		MPart part = partService.getActivePart();
+		if(part==null) return false;
+		return (part.getObject() instanceof WaveformViewer);
+	}
+
+	@Execute
+	public void execute(Shell shell, MApplication app, EModelService modelService, 
+			EPartService partService){
+		
+		MPart part = partService.getActivePart();
+		Object obj = part.getObject();
+		if(part!=null && (obj instanceof WaveformViewer)) { 
+			((WaveformViewer)obj).reloadDatabase();
+		}
+	    
+	}
+}