fixes database reopening problem due to locking

plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveformDb.java

@@ -62,4 +62,13 @@ public interface IWaveformDb extends IHierNode {
 	 */
 	public boolean isLoaded();
 
+	/**
+	 * close an open database.
+	 *
+	 * @param inp the inp
+	 * @return true, if successful
+	 */
+	public void close();
+
+
 }

plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/internal/WaveformDb.java

@@ -18,6 +18,7 @@ import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import java.util.Map.Entry;
 import java.util.concurrent.ConcurrentHashMap;
 
 import org.slf4j.Logger;
@@ -39,6 +40,7 @@ public class WaveformDb extends HierNode implements IWaveformDb, PropertyChangeL
 	/** The loaders. */
 	private static List<IWaveformDbLoaderFactory> loaderFactories = new LinkedList<>();
 
+	private List<IWaveformDbLoader> activeLoader = new ArrayList<>();
 	/** The loaded. */
 	private boolean loaded;
 
@@ -136,6 +138,7 @@ public class WaveformDb extends HierNode implements IWaveformDb, PropertyChangeL
 				loader.addPropertyChangeListener(this);
 				try {
 					loader.load(inp);
+					activeLoader.add(loader);
 				} catch (Exception e) {
 					LOG.error("error loading file "+inp.getName(), e);
 					retval=false;
@@ -158,6 +161,12 @@ public class WaveformDb extends HierNode implements IWaveformDb, PropertyChangeL
 		return retval;
 	}
 
+	@Override
+	public void close() {
+		for (IWaveformDbLoader entry : activeLoader) {
+			entry.dispose();
+		}
+	}
 	/**
 	 * Gets the file basename.
 	 *

plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/elements/RelationTypeToolControl.java

@@ -124,7 +124,7 @@ public class RelationTypeToolControl extends PartListener implements ISelectionC
 			    return;
 			}
 		}
-		if(comboViewer!=null) comboViewer.getCombo().setEnabled(false);
+		if(comboViewer!=null && !comboViewer.getCombo().isDisposed()) comboViewer.getCombo().setEnabled(false);
 	}
 
 	/* (non-Javadoc)

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

@@ -35,8 +35,12 @@ public class AddSeparatorHandler {
 			Object sel = ((WaveformViewer)part.getObject()).getSelection();
 			if( sel instanceof IStructuredSelection) {
 				if(((IStructuredSelection)sel).isEmpty()) return false;
-				Object o= ((IStructuredSelection)sel).getFirstElement();
-				return o instanceof TrackEntry;
+				IStructuredSelection isel = (IStructuredSelection) sel;
+				if(isel.size()==1)
+					return isel.getFirstElement() instanceof TrackEntry;
+				else if(isel.size()==2) {
+					return isel.toArray()[1] instanceof TrackEntry;
+				}
 			}
 		}
 		return false;

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

@@ -23,13 +23,13 @@ public class SelectAllHandler {
     @CanExecute
     public boolean canExecute(EPartService partService) {
     	MPart part = partService.getActivePart();
-    	return part.getObject() instanceof WaveformViewer;
+    	return part!=null && part.getObject() instanceof WaveformViewer;
     }
 
 	@Execute
 	public void execute(EPartService partService) {
 		MPart part = partService.getActivePart();
-		if(part.getObject() instanceof WaveformViewer)
+		if(part!=null && part.getObject() instanceof WaveformViewer)
 			((WaveformViewer) part.getObject()).selectAll();
 	}
 

plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/WaveformViewer.java

@@ -29,6 +29,7 @@ import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
 import javax.inject.Inject;
 import javax.inject.Named;
 
@@ -512,6 +513,12 @@ public class WaveformViewer implements IFileChangeListener, IPreferenceChangeLis
 		showTxDetails(false);
 	}
 
+	@PreDestroy
+	public void closeDatabase() {
+		if(database.isLoaded())
+			database.close();
+	}
+	
 	@Inject
 	@Optional
 	public void reactOnPrefsChange(@Preference(nodePath = PreferenceConstants.PREFERENCES_SCOPE) IEclipsePreferences prefs) {