tidy imports
[jalview.git] / src / jalview / gui / VamsasApplication.java
index 9bc1ffa..13f6692 100644 (file)
@@ -1,20 +1,19 @@
 /*
- * Jalview - A Sequence Alignment Editor and Viewer (Version 2.4)
- * Copyright (C) 2008 AM Waterhouse, J Procter, G Barton, M Clamp, S Searle
+ * Jalview - A Sequence Alignment Editor and Viewer (Version 2.8)
+ * Copyright (C) 2012 J Procter, AM Waterhouse, LM Lui, J Engelhardt, G Barton, M Clamp, S Searle
  * 
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
+ * This file is part of Jalview.
  * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * Jalview is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *  
+ * Jalview is distributed in the hope that it will be useful, but 
+ * WITHOUT ANY WARRANTY; without even the implied warranty 
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+ * PURPOSE.  See the GNU General Public License for more details.
  * 
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ * You should have received a copy of the GNU General Public License along with Jalview.  If not, see <http://www.gnu.org/licenses/>.
  */
 package jalview.gui;
 
@@ -28,6 +27,7 @@ import jalview.structure.SelectionListener;
 import jalview.structure.SelectionSource;
 import jalview.structure.StructureSelectionManager;
 import jalview.structure.VamsasListener;
+import jalview.structure.VamsasSource;
 
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
@@ -45,7 +45,6 @@ import uk.ac.vamsas.client.ClientHandle;
 import uk.ac.vamsas.client.IClient;
 import uk.ac.vamsas.client.IClientDocument;
 import uk.ac.vamsas.client.InvalidSessionDocumentException;
-import uk.ac.vamsas.client.NoDefaultSessionException;
 import uk.ac.vamsas.client.UserHandle;
 import uk.ac.vamsas.client.VorbaId;
 import uk.ac.vamsas.client.picking.IMessageHandler;
@@ -62,7 +61,7 @@ import uk.ac.vamsas.objects.core.Seg;
  * @author jimp
  * 
  */
-public class VamsasApplication implements SelectionSource
+public class VamsasApplication implements SelectionSource, VamsasSource
 {
   IClient vclient = null;
 
@@ -72,16 +71,19 @@ public class VamsasApplication implements SelectionSource
 
   Desktop jdesktop = null; // our jalview desktop reference
 
+  private boolean inInitialUpdate = true;
+
   // Cache.preferences for vamsas client session arena
   // preferences for check for default session at startup.
   // user and organisation stuff.
-  public VamsasApplication(Desktop jdesktop, File sessionPath)
+  public VamsasApplication(Desktop jdesktop, File sessionPath,
+          String sessionName)
   {
     // JBPNote:
     // we should create a session URI from the sessionPath and pass it to
     // the clientFactory - but the vamsas api doesn't cope with that yet.
     this.jdesktop = jdesktop;
-    initClientSession(null, sessionPath);
+    initClientSession(null, sessionPath, sessionName);
   }
 
   private static uk.ac.vamsas.client.IClientFactory getClientFactory()
@@ -115,7 +117,7 @@ public class VamsasApplication implements SelectionSource
 
   /**
    * @throws IOException
-   *                 or other if clientfactory instantiation failed.
+   *           or other if clientfactory instantiation failed.
    * @return list of current sessions or null if no session exists.
    */
   public static String[] getSessionList() throws Exception
@@ -128,12 +130,18 @@ public class VamsasApplication implements SelectionSource
    * session
    * 
    * @param sess
-   *                null or a valid session url
+   *          null or a valid session url
    * @param vamsasDocument
-   *                null or a valid vamsas document file
+   *          null or a valid vamsas document file
    * @return false if no vamsas connection was made
    */
-  private boolean initClientSession(String sess, File vamsasDocument)
+  private void initClientSession(String sess, File vamsasDocument)
+  {
+    initClientSession(sess, vamsasDocument, null);
+  }
+
+  private boolean initClientSession(String sess, File vamsasDocument,
+          String newDocSessionName)
   {
     try
     {
@@ -149,8 +157,16 @@ public class VamsasApplication implements SelectionSource
         }
         try
         {
-          vclient = clientfactory.openAsNewSessionIClient(app,
-                  vamsasDocument);
+          if (newDocSessionName != null)
+          {
+            vclient = clientfactory.openAsNewSessionIClient(app,
+                    vamsasDocument, newDocSessionName);
+          }
+          else
+          {
+            vclient = clientfactory.openAsNewSessionIClient(app,
+                    vamsasDocument);
+          }
         } catch (InvalidSessionDocumentException e)
         {
           JOptionPane
@@ -206,14 +222,12 @@ public class VamsasApplication implements SelectionSource
     } catch (Error e)
     {
       Cache.log
-              .warn(
-                      "Probable SERIOUS VAMSAS client incompatibility - carrying on regardless",
+              .warn("Probable SERIOUS VAMSAS client incompatibility - carrying on regardless",
                       e);
     } catch (Exception e)
     {
       Cache.log
-              .warn(
-                      "Probable VAMSAS client incompatibility - carrying on regardless",
+              .warn("Probable VAMSAS client incompatibility - carrying on regardless",
                       e);
     }
   }
@@ -225,8 +239,8 @@ public class VamsasApplication implements SelectionSource
    */
   private ClientHandle getJalviewHandle()
   {
-    return new ClientHandle("jalview.bin.Jalview", jalview.bin.Cache
-            .getProperty("VERSION"));
+    return new ClientHandle("jalview.bin.Jalview",
+            jalview.bin.Cache.getProperty("VERSION"));
   }
 
   /**
@@ -252,9 +266,11 @@ public class VamsasApplication implements SelectionSource
     addDocumentUpdateHandler();
     addStoreDocumentHandler();
     startSession();
+    inInitialUpdate = true;
     Cache.log
             .debug("Jalview loading the Vamsas Session for the first time.");
     dealWithDocumentUpdate(false); // we don't push an update out to the
+    inInitialUpdate = false;
     // document yet.
     Cache.log.debug("... finished update for the first time.");
   }
@@ -287,8 +303,7 @@ public class VamsasApplication implements SelectionSource
     } catch (Exception e)
     {
       Cache.log
-              .warn(
-                      "Exception whilst refreshing jalview windows after a vamsas document update.",
+              .warn("Exception whilst refreshing jalview windows after a vamsas document update.",
                       e);
     }
   }
@@ -303,24 +318,32 @@ public class VamsasApplication implements SelectionSource
         Cache.log.info("Jalview updating to the Vamsas Session.");
 
         dealWithDocumentUpdate(true);
-        /*
-         * IClientDocument cdoc=null; try { cdoc = vclient.getClientDocument(); }
-         * catch (Exception e) { Cache.log.error("Failed to get client document
-         * for update."); // RAISE A WARNING DIALOG disableGui(false); return; }
-         * updateVamsasDocument(cdoc); updateJalviewGui();
-         * cdoc.setVamsasRoots(cdoc.getVamsasRoots()); // propagate update flags
-         * back vclient.updateDocument(cdoc);
-         */
         Cache.log.info("Jalview finished updating to the Vamsas Session.");
-        // TODO Auto-generated method stub
       }
 
     });
     udthread.start();
   }
 
+  /**
+   * leave a session, prompting the user to save if necessary
+   */
   public void end_session()
   {
+    end_session(true);
+  }
+
+  private boolean promptUser = true;
+
+  /**
+   * leave a session, optionally prompting the user to save if necessary
+   * 
+   * @param promptUser
+   *          when true enable prompting by this application
+   */
+
+  public void end_session(boolean promptUser)
+  {
     if (!inSession())
       throw new Error("Jalview not connected to Vamsas session.");
     Cache.log.info("Jalview disconnecting from the Vamsas Session.");
@@ -328,8 +351,11 @@ public class VamsasApplication implements SelectionSource
     {
       if (joinedSession)
       {
+        boolean ourprompt = this.promptUser;
+        this.promptUser = promptUser;
         vclient.finalizeClient();
         Cache.log.info("Jalview has left the session.");
+        this.promptUser = ourprompt; // restore default value
       }
       else
       {
@@ -409,9 +435,11 @@ public class VamsasApplication implements SelectionSource
    * bindings is made.
    * 
    * @param doc
+   * @return number of views stored in document (updated and new views)
    */
-  public void updateVamsasDocument(IClientDocument doc)
+  public int updateVamsasDocument(IClientDocument doc)
   {
+    int storedviews = 0;
     ensureJvVamsas();
     errorsDuringUpdate = false;
     errorsDuringAppUpdate = false;
@@ -423,7 +451,7 @@ public class VamsasApplication implements SelectionSource
 
     if (frames == null)
     {
-      return;
+      return 0;
     }
     Hashtable skipList = new Hashtable();
     Hashtable viewset = new Hashtable();
@@ -460,6 +488,7 @@ public class VamsasApplication implements SelectionSource
             }
             else
             {
+              storedviews++;
               // could try to eliminate sequenceSetId from skiplist ..
               // (skipList.containsKey(af.getViewport().getSequenceSetId()))
               // remember sequenceSetId so we can skip all the other views on
@@ -505,6 +534,7 @@ public class VamsasApplication implements SelectionSource
       errorsDuringAppUpdate = true;
     }
     vds.clearSkipList();
+    return storedviews;
   }
 
   private Entry baseProvEntry()
@@ -521,10 +551,12 @@ public class VamsasApplication implements SelectionSource
    * do a vamsas document update or update jalview from the vamsas document
    * 
    * @param fromJalview
-   *                true to update from jalview to the vamsas document
+   *          true to update from jalview to the vamsas document
+   * @return total number of stored alignments in the document after the update
    */
-  protected void dealWithDocumentUpdate(boolean fromJalview)
+  protected int dealWithDocumentUpdate(boolean fromJalview)
   {
+    int storedviews = 0;
     // called by update handler for document update.
     Cache.log.debug("Updating jalview from changed vamsas document.");
     disableGui(true);
@@ -540,7 +572,7 @@ public class VamsasApplication implements SelectionSource
       }
       if (fromJalview)
       {
-        this.updateVamsasDocument(cdoc);
+        storedviews += updateVamsasDocument(cdoc);
         if (Cache.log.isDebugEnabled())
         {
           Cache.log
@@ -582,10 +614,12 @@ public class VamsasApplication implements SelectionSource
       ee.printStackTrace(System.err);
       // recover object map backup, since its probably corrupted with references
       // to Vobjects that don't exist anymore.
-      this.recover_objectMappingBackup();
+      recover_objectMappingBackup();
+      storedviews = 0;
     }
     Cache.log.debug("Finished updating from document change.");
     disableGui(false);
+    return storedviews;
   }
 
   private void addDocumentUpdateHandler()
@@ -612,24 +646,33 @@ public class VamsasApplication implements SelectionSource
             {
               public void propertyChange(PropertyChangeEvent evt)
               {
-                Cache.log
-                        .debug("Asking user if the vamsas session should be stored.");
-                int reply = JOptionPane
-                        .showInternalConfirmDialog(
-                                Desktop.desktop,
-                                "The current VAMSAS session has unsaved data - do you want to save it ?",
-                                "VAMSAS Session Shutdown",
-                                JOptionPane.YES_NO_OPTION,
-                                JOptionPane.QUESTION_MESSAGE);
-
-                if (reply == JOptionPane.YES_OPTION)
+                if (client.promptUser)
                 {
-                  Cache.log.debug("Prompting for vamsas store filename.");
-                  Desktop.instance.vamsasSave_actionPerformed(null);
-                  Cache.log.debug("Finished attempt at storing document.");
+                  Cache.log
+                          .debug("Asking user if the vamsas session should be stored.");
+                  int reply = JOptionPane
+                          .showInternalConfirmDialog(
+                                  Desktop.desktop,
+                                  "The current VAMSAS session has unsaved data - do you want to save it ?",
+                                  "VAMSAS Session Shutdown",
+                                  JOptionPane.YES_NO_OPTION,
+                                  JOptionPane.QUESTION_MESSAGE);
+
+                  if (reply == JOptionPane.YES_OPTION)
+                  {
+                    Cache.log.debug("Prompting for vamsas store filename.");
+                    Desktop.instance.vamsasSave_actionPerformed(null);
+                    Cache.log
+                            .debug("Finished attempt at storing document.");
+                  }
+                  Cache.log
+                          .debug("finished dealing with REQUESTTOCLOSE event.");
+                }
+                else
+                {
+                  Cache.log
+                          .debug("Ignoring store document request (promptUser==false)");
                 }
-                Cache.log
-                        .debug("finished dealing with REQUESTTOCLOSE event.");
               }
             });
     Cache.log.debug("Added Jalview handler for vamsas document updates.");
@@ -658,12 +701,18 @@ public class VamsasApplication implements SelectionSource
    * IO failed
    * 
    * @throws Error
-   *                 if backup_objectMapping was not called.
+   *           if backup_objectMapping was not called.
    */
   public void recover_objectMappingBackup()
   {
     if (_backup_vobj2jv == null)
     {
+      if (inInitialUpdate)
+      {
+        // nothing to recover so just
+        return;
+      }
+
       throw new Error(
               "IMPLEMENTATION ERROR: Cannot recover vamsas object mappings - no backup was made.");
     }
@@ -706,8 +755,8 @@ public class VamsasApplication implements SelectionSource
       {
         final IPickManager pm = vclient.getPickManager();
         final StructureSelectionManager ssm = StructureSelectionManager
-                .getStructureSelectionManager();
-        final SelectionSource me = this;
+                .getStructureSelectionManager(Desktop.instance);
+        final VamsasApplication me = this;
         pm.registerMessageHandler(new IMessageHandler()
         {
           String last = null;
@@ -739,8 +788,8 @@ public class VamsasApplication implements SelectionSource
                 // Cache.log.debug("Handling Mouse over "+mm.getVorbaID()+"
                 // bound to "+jvobj+" at "+mm.getPosition());
                 // position is character position in aligned sequence
-                ssm.mouseOverVamsasSequence((SequenceI) jvobj, mm
-                        .getPosition());
+                ssm.mouseOverVamsasSequence((SequenceI) jvobj,
+                        mm.getPosition(), me);
               }
             }
             if (message instanceof uk.ac.vamsas.client.picking.SelectionMessage)
@@ -748,12 +797,14 @@ public class VamsasApplication implements SelectionSource
               // we only care about AlignmentSequence selections
               SelectionMessage sm = (SelectionMessage) message;
               sm.validate();
-              System.err.println("Received\n"+sm.getRawMessage());
-              Object[] jvobjs = sm.getVorbaIDs()==null ? null : new Object[sm.getVorbaIDs().length];
-              if (jvobjs==null)
+              System.err.println("Received\n" + sm.getRawMessage());
+              Object[] jvobjs = sm.getVorbaIDs() == null ? null
+                      : new Object[sm.getVorbaIDs().length];
+              if (jvobjs == null)
               {
-                // TODO: rationalise : can only clear a selection over a referred to object
-                ssm.sendSelection(null,null,me);
+                // TODO: rationalise : can only clear a selection over a
+                // referred to object
+                ssm.sendSelection(null, null, me);
                 return;
               }
               Class type = null;
@@ -773,9 +824,9 @@ public class VamsasApplication implements SelectionSource
                 ;
                 if (type != jvobjs[o].getClass())
                 {
-                  send=false;
+                  send = false;
                   // discard - can't cope with selections over mixed objects
-                  continue;
+                  // continue;
                 }
               }
               SequenceGroup jselection = null;
@@ -784,7 +835,8 @@ public class VamsasApplication implements SelectionSource
               {
                 if (jvobjs.length == 1)
                 {
-                  // TODO if (sm.isNone())// send a message to select the specified columns over the
+                  // TODO if (sm.isNone())// send a message to select the
+                  // specified columns over the
                   // given
                   // alignment
 
@@ -797,15 +849,17 @@ public class VamsasApplication implements SelectionSource
                 SequenceI seq;
                 boolean aligned = ((jalview.datamodel.Sequence) jvobjs[0])
                         .getDatasetSequence() != null;
-                int maxWidth=0;
+                int maxWidth = 0;
                 if (aligned)
                 {
                   jselection = new SequenceGroup();
-                  jselection.addSequence(seq =
-                        (jalview.datamodel.Sequence) jvobjs[0], false);
+                  jselection.addSequence(
+                          seq = (jalview.datamodel.Sequence) jvobjs[0],
+                          false);
                   maxWidth = seq.getLength();
                 }
-                for (int c = 1; aligned && jvobjs.length > 1 && c < jvobjs.length; c++)
+                for (int c = 1; aligned && jvobjs.length > 1
+                        && c < jvobjs.length; c++)
                 {
                   if (((jalview.datamodel.Sequence) jvobjs[c])
                           .getDatasetSequence() == null)
@@ -816,12 +870,13 @@ public class VamsasApplication implements SelectionSource
                   else
                   {
                     jselection.addSequence(
-                            seq = (jalview.datamodel.Sequence) jvobjs[c], false);
-                    if (maxWidth<seq.getLength())
+                            seq = (jalview.datamodel.Sequence) jvobjs[c],
+                            false);
+                    if (maxWidth < seq.getLength())
                     {
                       maxWidth = seq.getLength();
                     }
-                    
+
                   }
                 }
                 if (!aligned)
@@ -844,41 +899,37 @@ public class VamsasApplication implements SelectionSource
                   // select the associated ranges on them.
                   if (sm.getRanges() != null)
                   {
-                    int[] prange = uk.ac.vamsas.objects.utils.Range.getBounds(sm.getRanges());
-                    boolean rangeset=false;
+                    int[] prange = uk.ac.vamsas.objects.utils.Range
+                            .getBounds(sm.getRanges());
+                    jselection.setStartRes(prange[0] - 1);
+                    jselection.setEndRes(prange[1] - 1);
+                    prange = uk.ac.vamsas.objects.utils.Range
+                            .getIntervals(sm.getRanges());
                     colsel = new ColumnSelection();
-                    prange = uk.ac.vamsas.objects.utils.Range.getIntervals(sm.getRanges());
-                    for (int p=0;p<prange.length;p+=2)
+                    for (int p = 0; p < prange.length; p += 2)
                     {
-                      int d = (prange[p]<=prange[p+1]) ? 1 : -1;
-                      if (!rangeset)
+                      int d = (prange[p] <= prange[p + 1]) ? 1 : -1;
+                      // try to join up adjacent columns to make a larger
+                      // selection
+                      // lower and upper bounds
+                      int l = (d < 0) ? 1 : 0;
+                      int u = (d > 0) ? 1 : 0;
+
+                      if (jselection.getStartRes() > 0
+                              && prange[p + l] == jselection.getStartRes())
+                      {
+                        jselection.setStartRes(prange[p + l] - 1);
+                      }
+                      if (jselection.getEndRes() <= maxWidth
+                              && prange[p + u] == (jselection.getEndRes() + 2))
                       {
-                        if (jselection!=null)
-                        {
-                          // set the bounds of the selected area using the first interval.
-                          jselection.setStartRes(prange[p]-1);
-                          jselection.setEndRes(prange[p+1]-1);
-                          rangeset=true;
-                        }
-                      } else {
-                        // try to join up adjacent columns to make a larger selection
-                        // lower and upper bounds
-                        int l=(d<0) ? 1 : 0;
-                        int u=(d>0) ? 1 : 0;
-                        
-                        if (jselection.getStartRes()>0 && prange[p+l]==jselection.getStartRes())
-                        {
-                          jselection.setStartRes(prange[p+l]-1);
-                        }
-                        if (jselection.getEndRes()<=maxWidth && prange[p+u]==(jselection.getEndRes()+2))
-                        {
-                          jselection.setEndRes(prange[p+u]-1);
-                        }
+                        jselection.setEndRes(prange[p + u] - 1);
                       }
                       // mark all the columns in the range.
-                      for (int sr=prange[p],er=prange[p+1],de=er+d; sr!=de; sr+=d)
+                      for (int sr = prange[p], er = prange[p + 1], de = er
+                              + d; sr != de; sr += d)
                       {
-                        colsel.addElement(sr-1);
+                        colsel.addElement(sr - 1);
                       }
                     }
                   }
@@ -906,7 +957,8 @@ public class VamsasApplication implements SelectionSource
 
           int i = -1;
 
-          public void mouseOver(SequenceI seq, int index)
+          public void mouseOver(SequenceI seq, int index,
+                  VamsasSource source)
           {
             if (jv2vobj == null)
               return;
@@ -915,8 +967,9 @@ public class VamsasApplication implements SelectionSource
               VorbaId v = (VorbaId) jv2vobj.get(seq);
               if (v != null)
               {
-                Cache.log.debug("Mouse over " + v.getId() + " bound to "
-                        + seq + " at " + index);
+                // this should really be a trace message.
+                // Cache.log.debug("Mouse over " + v.getId() + " bound to "
+                // + seq + " at " + index);
                 last = seq;
                 i = index;
                 MouseOverMessage message = new MouseOverMessage(v.getId(),
@@ -932,9 +985,16 @@ public class VamsasApplication implements SelectionSource
           public void selection(SequenceGroup seqsel,
                   ColumnSelection colsel, SelectionSource source)
           {
+            if (vobj2jv == null)
+            {
+              Cache.log
+                      .warn("Selection listener still active for dead session.");
+              // not in a session.
+              return;
+            }
             if (source != me)
             {
-              AlignmentI visal=null;
+              AlignmentI visal = null;
               if (source instanceof AlignViewport)
               {
                 visal = ((AlignViewport) source).getAlignment();
@@ -947,8 +1007,12 @@ public class VamsasApplication implements SelectionSource
                 if (source instanceof AlignViewport)
                 {
                   // the empty selection.
-                  sm = new SelectionMessage("jalview", new String[] { ((AlignViewport)source).getSequenceSetId()}, null, true);
-                } else {
+                  sm = new SelectionMessage("jalview", new String[]
+                  { ((AlignViewport) source).getSequenceSetId() }, null,
+                          true);
+                }
+                else
+                {
                   // the empty selection.
                   sm = new SelectionMessage("jalview", null, null, true);
                 }
@@ -957,10 +1021,8 @@ public class VamsasApplication implements SelectionSource
               {
                 String[] vobj = new String[seqsel.getSize()];
                 int o = 0;
-                Enumeration sels = seqsel.getSequences(null).elements();
-                while (sels.hasMoreElements())
+                for (SequenceI sel : seqsel.getSequences(null))
                 {
-                  SequenceI sel = (SequenceI) sels.nextElement();
                   VorbaId v = (VorbaId) jv2vobj.get(sel);
                   if (v != null)
                   {
@@ -975,39 +1037,57 @@ public class VamsasApplication implements SelectionSource
                   t = null;
                 }
                 Input range = null;
-                if (seqsel!=null && colsel != null)
+                if (seqsel != null && colsel != null)
                 {
                   // deparse the colsel into positions on the vamsas alignment
                   // sequences
                   range = new Input();
-                  if (colsel.getSelected()!=null && colsel.getSelected().size()>0 && visal!=null && seqsel.getSize()==visal.getHeight())
+                  if (colsel.getSelected() != null
+                          && colsel.getSelected().size() > 0
+                          && visal != null
+                          && seqsel.getSize() == visal.getHeight())
                   {
-                    // gather selected columns outwith the sequence positions too
+                    // gather selected columns outwith the sequence positions
+                    // too
                     Enumeration cols = colsel.getSelected().elements();
                     while (cols.hasMoreElements())
                     {
                       int ival = ((Integer) cols.nextElement()).intValue();
                       Pos p = new Pos();
-                      p.setI(ival+1);
+                      p.setI(ival + 1);
                       range.addPos(p);
                     }
-                  } else {
-                    int[] intervals = colsel.getVisibleContigs(seqsel.getStartRes(), seqsel.getEndRes()+1);
-                    for (int iv=0;iv<intervals.length; iv+=2)
+                  }
+                  else
+                  {
+                    int[] intervals = colsel.getVisibleContigs(
+                            seqsel.getStartRes(), seqsel.getEndRes() + 1);
+                    for (int iv = 0; iv < intervals.length; iv += 2)
                     {
                       Seg s = new Seg();
-                      s.setStart(intervals[iv]+1); // vamsas indices begin at 1, not zero.
-                      s.setEnd(intervals[iv+1]+1);
+                      s.setStart(intervals[iv] + 1); // vamsas indices begin at
+                      // 1, not zero.
+                      s.setEnd(intervals[iv + 1] + 1);
                       s.setInclusive(true);
                       range.addSeg(s);
                     }
                   }
                 }
-                sm = new SelectionMessage("jalview", vobj, range);
+                if (vobj.length > 0)
+                {
+                  sm = new SelectionMessage("jalview", vobj, range);
+                }
+                else
+                {
+                  sm = null;
+                }
+              }
+              if (sm != null)
+              {
+                sm.validate(); // debug
+                Cache.log.debug("Selection Message\n" + sm.getRawMessage());
+                pm.sendMessage(sm);
               }
-              sm.validate(); // debug
-              Cache.log.debug("Pick Message\n"+sm.getRawMessage());
-              pm.sendMessage(sm);
             }
           }
 
@@ -1020,4 +1100,13 @@ public class VamsasApplication implements SelectionSource
       }
     }
   }
+
+  public String getCurrentSession()
+  {
+    if (vclient != null)
+    {
+      return (vclient.getSessionUrn());
+    }
+    return null;
+  }
 }