X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fdatamodel%2FColumnSelection.java;h=c2327819c81923ce95e11d96da730e9544718cc4;hb=e224b72118c12cd77ae96f0f8d86c123e0416dc7;hp=c895b2f3c8b2a1c604f416bf585dbac5ff09e9d8;hpb=5655997c202bfcb4ab2778999d785490d3a7dbae;p=jalview.git

diff --git a/src/jalview/datamodel/ColumnSelection.java b/src/jalview/datamodel/ColumnSelection.java
index c895b2f..c232781 100644
--- a/src/jalview/datamodel/ColumnSelection.java
+++ b/src/jalview/datamodel/ColumnSelection.java
@@ -1,49 +1,229 @@
 /*
- * Jalview - A Sequence Alignment Editor and Viewer
- * Copyright (C) 2006 AM Waterhouse, J Procter, 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
+ * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
+ * Copyright (C) $$Year-Rel$$ The Jalview Authors
+ * 
+ * This file is part of Jalview.
+ * 
+ * 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.
- *
- * 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 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
+ * along with Jalview.  If not, see <http://www.gnu.org/licenses/>.
+ * The Jalview Authors are detailed in the 'AUTHORS' file.
  */
 package jalview.datamodel;
 
+import jalview.util.Comparison;
 import jalview.util.ShiftList;
+import jalview.viewmodel.annotationfilter.AnnotationFilterParameter;
+import jalview.viewmodel.annotationfilter.AnnotationFilterParameter.SearchableAnnotationField;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.BitSet;
+import java.util.Collections;
+import java.util.List;
+import java.util.Vector;
 
 /**
  * NOTE: Columns are zero based.
  */
 public class ColumnSelection
 {
-  Vector selected = new Vector();
+  private class IntList
+  {
+    /*
+     * list of selected columns (ordered by selection order, not column order)
+     */
+    private List<Integer> order = new ArrayList<Integer>();
+
+    /**
+     * bitfield for column selection - allows quick lookup
+     */
+    private BitSet selected = new BitSet();
+
+    /**
+     * adds a new column i to the selection - only if i is not already selected
+     * 
+     * @param i
+     */
+    public void add(int i)
+    {
+      if (!selected.get(i))
+      {
+        order.add(Integer.valueOf(i));
+        selected.set(i);
+      }
+    }
+
+    public void clear()
+    {
+      order.clear();
+      selected.clear();
+    }
+
+    public void remove(int col)
+    {
+
+      Integer colInt = new Integer(col);
+
+      if (selected.get(col))
+      {
+        // if this ever changes to List.remove(), ensure Integer not int
+        // argument
+        // as List.remove(int i) removes the i'th item which is wrong
+        order.remove(colInt);
+        selected.clear(col);
+      }
+    }
+
+    public boolean contains(Integer colInt)
+    {
+      return selected.get(colInt);
+    }
+
+    public boolean isEmpty()
+    {
+      return order.isEmpty();
+    }
+
+    public List<Integer> getList()
+    {
+      return order;
+    }
+
+    public int size()
+    {
+      return order.size();
+    }
+
+    /**
+     * gets the column that was selected first, second or i'th
+     * 
+     * @param i
+     * @return
+     */
+    public int elementAt(int i)
+    {
+      return order.get(i);
+    }
+
+    protected boolean pruneColumnList(final List<int[]> shifts)
+    {
+      int s = 0, t = shifts.size();
+      int[] sr = shifts.get(s++);
+      boolean pruned = false;
+      int i = 0, j = order.size();
+      while (i < j && s <= t)
+      {
+        int c = order.get(i++).intValue();
+        if (sr[0] <= c)
+        {
+          if (sr[1] + sr[0] >= c)
+          { // sr[1] -ve means inseriton.
+            order.remove(--i);
+            selected.clear(c);
+            j--;
+          }
+          else
+          {
+            if (s < t)
+            {
+              sr = shifts.get(s);
+            }
+            s++;
+          }
+        }
+      }
+      return pruned;
+    }
+
+    /**
+     * shift every selected column at or above start by change
+     * 
+     * @param start
+     *          - leftmost column to be shifted
+     * @param change
+     *          - delta for shift
+     */
+    public void compensateForEdits(int start, int change)
+    {
+      BitSet mask = new BitSet();
+      for (int i = 0; i < order.size(); i++)
+      {
+        int temp = order.get(i);
+
+        if (temp >= start)
+        {
+          // clear shifted bits and update List of selected columns
+          selected.clear(temp);
+          mask.set(temp - change);
+          order.set(i, new Integer(temp - change));
+        }
+      }
+      // lastly update the bitfield all at once
+      selected.or(mask);
+    }
+
+    public boolean isSelected(int column)
+    {
+      return selected.get(column);
+    }
+
+    public int getMaxColumn()
+    {
+      return selected.length() - 1;
+    }
+
+    public int getMinColumn()
+    {
+      return selected.get(0) ? 0 : selected.nextSetBit(0);
+    }
 
-  //Vector of int [] {startCol, endCol}
-  Vector hiddenColumns;
+    /**
+     * @return a series of selection intervals along the range
+     */
+    public List<int[]> getRanges()
+    {
+      List<int[]> rlist = new ArrayList<int[]>();
+      if (selected.isEmpty())
+      {
+        return rlist;
+      }
+      int next = selected.nextSetBit(0), clear = -1;
+      while (next != -1)
+      {
+        clear = selected.nextClearBit(next);
+        rlist.add(new int[] { next, clear - 1 });
+        next = selected.nextSetBit(clear);
+      }
+      return rlist;
+    }
+  }
+
+  IntList selected = new IntList();
+
+  /*
+   * list of hidden column [start, end] ranges; the list is maintained in
+   * ascending start column order
+   */
+  Vector<int[]> hiddenColumns;
 
   /**
    * Add a column to the selection
-   *
-   * @param col index of column
+   * 
+   * @param col
+   *          index of column
    */
   public void addElement(int col)
   {
-    Integer column = new Integer(col);
-    if (!selected.contains(column))
-    {
-      selected.addElement(column);
-    }
+    selected.add(col);
   }
 
   /**
@@ -51,346 +231,376 @@ public class ColumnSelection
    */
   public void clear()
   {
-    selected.removeAllElements();
+    selected.clear();
   }
 
   /**
-   * removes col from selection
-   *
-   * @param col index of column to be removed
+   * Removes value 'col' from the selection (not the col'th item)
+   * 
+   * @param col
+   *          index of column to be removed
    */
   public void removeElement(int col)
   {
-    Integer colInt = new Integer(col);
-
-    if (selected.contains(colInt))
-    {
-      selected.removeElement(colInt);
-    }
+    selected.remove(col);
   }
 
   /**
    * removes a range of columns from the selection
-   * @param start int - first column in range to be removed
-   * @param end int - last col
+   * 
+   * @param start
+   *          int - first column in range to be removed
+   * @param end
+   *          int - last col
    */
   public void removeElements(int start, int end)
   {
     Integer colInt;
-    for(int i=start; i<end; i++)
+    for (int i = start; i < end; i++)
     {
       colInt = new Integer(i);
       if (selected.contains(colInt))
       {
-        selected.removeElement(colInt);
+        selected.remove(colInt);
       }
     }
   }
+
   /**
-   *
-   * @return Vector containing selected columns as Integers
+   * Returns a list of selected columns. The list contains no duplicates but is
+   * not necessarily ordered. It also may include columns hidden from the
+   * current view
    */
-  public Vector getSelected()
+  public List<Integer> getSelected()
   {
-    return selected;
+    return selected.getList();
   }
 
   /**
-   *
-   * @param col index to search for in column selection
-   *
-   * @return true if Integer(col) is in selection.
+   * @return list of int arrays containing start and end column position for
+   *         runs of selected columns ordered from right to left.
    */
-  public boolean contains(int col)
+  public List<int[]> getSelectedRanges()
   {
-    return selected.contains(new Integer(col));
+    return selected.getRanges();
   }
 
   /**
-   * DOCUMENT ME!
-   *
-   * @param i DOCUMENT ME!
-   *
-   * @return DOCUMENT ME!
+   * 
+   * @param col
+   *          index to search for in column selection
+   * 
+   * @return true if col is selected
    */
-  public int columnAt(int i)
+  public boolean contains(int col)
   {
-    return ((Integer) selected.elementAt(i)).intValue();
+    return (col > -1) ? selected.isSelected(col) : false;
   }
 
   /**
-   * DOCUMENT ME!
-   *
-   * @return DOCUMENT ME!
+   * Answers true if no columns are selected, else false
    */
-  public int size()
+  public boolean isEmpty()
   {
-    return selected.size();
+    return selected == null || selected.isEmpty();
   }
 
   /**
-   * DOCUMENT ME!
-   *
-   * @return DOCUMENT ME!
+   * rightmost selected column
+   * 
+   * @return rightmost column in alignment that is selected
    */
   public int getMax()
   {
-    int max = -1;
-
-    for (int i = 0; i < selected.size(); i++)
+    if (selected.isEmpty())
     {
-      if (columnAt(i) > max)
-      {
-        max = columnAt(i);
-      }
+      return -1;
     }
-
-    return max;
+    return selected.getMaxColumn();
   }
 
   /**
-   * DOCUMENT ME!
-   *
-   * @return DOCUMENT ME!
+   * Leftmost column in selection
+   * 
+   * @return column index of leftmost column in selection
    */
   public int getMin()
   {
-    int min = 1000000000;
-
-    for (int i = 0; i < selected.size(); i++)
+    if (selected.isEmpty())
     {
-      if (columnAt(i) < min)
-      {
-        min = columnAt(i);
-      }
+      return 1000000000;
     }
-
-    return min;
+    return selected.getMinColumn();
   }
 
-
   /**
    * propagate shift in alignment columns to column selection
-   *
-   * @param start beginning of edit
-   * @param left shift in edit (+ve for removal, or -ve for inserts)
+   * 
+   * @param start
+   *          beginning of edit
+   * @param left
+   *          shift in edit (+ve for removal, or -ve for inserts)
    */
-  public void compensateForEdit(int start, int change)
+  public List<int[]> compensateForEdit(int start, int change)
   {
-    for (int i = 0; i < size(); i++)
-    {
-      int temp = columnAt(i);
+    List<int[]> deletedHiddenColumns = null;
+    selected.compensateForEdits(start, change);
 
-      if (temp >= start)
-      {
-        selected.setElementAt(new Integer(temp - change), i);
-      }
-    }
-
-    if(hiddenColumns!=null)
+    if (hiddenColumns != null)
     {
-      for(int i=0; i<hiddenColumns.size(); i++)
+      deletedHiddenColumns = new ArrayList<int[]>();
+      int hSize = hiddenColumns.size();
+      for (int i = 0; i < hSize; i++)
       {
-        int[] region = (int[]) hiddenColumns.elementAt(i);
-        if(region[0] > start)
+        int[] region = hiddenColumns.elementAt(i);
+        if (region[0] > start && start + change > region[1])
+        {
+          deletedHiddenColumns.add(region);
+
+          hiddenColumns.removeElementAt(i);
+          i--;
+          hSize--;
+          continue;
+        }
+
+        if (region[0] > start)
         {
           region[0] -= change;
           region[1] -= change;
         }
-        if(region[0]<0)
+
+        if (region[0] < 0)
+        {
           region[0] = 0;
-        if(region[1] <0)
-          region[1] = 0;
+        }
+
       }
+
+      this.revealHiddenColumns(0);
     }
+
+    return deletedHiddenColumns;
   }
+
   /**
-   * propagate shift in alignment columns to column selection
-   * special version of compensateForEdit - allowing for edits within hidden regions
-   * @param start beginning of edit
-   * @param left shift in edit (+ve for removal, or -ve for inserts)
+   * propagate shift in alignment columns to column selection special version of
+   * compensateForEdit - allowing for edits within hidden regions
+   * 
+   * @param start
+   *          beginning of edit
+   * @param left
+   *          shift in edit (+ve for removal, or -ve for inserts)
    */
   private void compensateForDelEdits(int start, int change)
   {
-    for (int i = 0; i < size(); i++)
-    {
-      int temp = columnAt(i);
 
-      if (temp >= start)
-      {
-        selected.setElementAt(new Integer(temp - change), i);
-      }
-    }
+    selected.compensateForEdits(start, change);
 
-    if(hiddenColumns!=null)
+    if (hiddenColumns != null)
     {
-      for(int i=0; i<hiddenColumns.size(); i++)
+      for (int i = 0; i < hiddenColumns.size(); i++)
       {
-        int[] region = (int[]) hiddenColumns.elementAt(i);
-        if(region[0] >= start)
+        int[] region = hiddenColumns.elementAt(i);
+        if (region[0] >= start)
         {
           region[0] -= change;
         }
-        if (region[1]>= start) {
-          region[1] -=change;
+        if (region[1] >= start)
+        {
+          region[1] -= change;
         }
-        if (region[1]<region[0]) {
+        if (region[1] < region[0])
+        {
           hiddenColumns.removeElementAt(i--);
         }
 
-        if(region[0]<0)
+        if (region[0] < 0)
+        {
           region[0] = 0;
-        if(region[1] <0)
+        }
+        if (region[1] < 0)
+        {
           region[1] = 0;
+        }
       }
     }
   }
+
   /**
-   * Adjust hidden column boundaries based on a series of column
-   * additions or deletions in visible regions.
+   * Adjust hidden column boundaries based on a series of column additions or
+   * deletions in visible regions.
+   * 
    * @param shiftrecord
    * @return
    */
-  public ShiftList compensateForEdits(ShiftList shiftrecord) {
-    if (shiftrecord!=null) {
-      Vector shifts = shiftrecord.shifts;
-      if (shifts!=null && shifts.size()>0) {
-        int shifted=0;
-        for (int i=0,j=shifts.size(); i<j; i++) {
-          int[] sh = (int[]) shifts.elementAt(i);
-          //compensateForEdit(shifted+sh[0], sh[1]);
-          compensateForDelEdits(shifted+sh[0], sh[1]);
-          shifted-=sh[1];
+  public ShiftList compensateForEdits(ShiftList shiftrecord)
+  {
+    if (shiftrecord != null)
+    {
+      final List<int[]> shifts = shiftrecord.getShifts();
+      if (shifts != null && shifts.size() > 0)
+      {
+        int shifted = 0;
+        for (int i = 0, j = shifts.size(); i < j; i++)
+        {
+          int[] sh = shifts.get(i);
+          // compensateForEdit(shifted+sh[0], sh[1]);
+          compensateForDelEdits(shifted + sh[0], sh[1]);
+          shifted -= sh[1];
         }
       }
       return shiftrecord.getInverse();
     }
     return null;
   }
+
   /**
-   * removes intersection of position,length ranges in deletions
-   * from the start,end regions marked in intervals.
-   * @param deletions
+   * removes intersection of position,length ranges in deletions from the
+   * start,end regions marked in intervals.
+   * 
+   * @param shifts
    * @param intervals
    * @return
    */
-  private boolean pruneIntervalVector(Vector deletions, Vector intervals) {
-    boolean pruned=false;
-    int i=0,j=intervals.size()-1, s=0, t=deletions.size()-1;
-    int hr[]=(int[]) intervals.elementAt(i);
-    int sr[]=(int[]) deletions.elementAt(s);
-    while (i<=j && s<=t) {
-      boolean trailinghn=hr[1]>=sr[0];
-      if (!trailinghn) {
-        if (i<j)
-          hr=(int[]) intervals.elementAt(++i);
+  private boolean pruneIntervalVector(final List<int[]> shifts,
+          Vector<int[]> intervals)
+  {
+    boolean pruned = false;
+    int i = 0, j = intervals.size() - 1, s = 0, t = shifts.size() - 1;
+    int hr[] = intervals.elementAt(i);
+    int sr[] = shifts.get(s);
+    while (i <= j && s <= t)
+    {
+      boolean trailinghn = hr[1] >= sr[0];
+      if (!trailinghn)
+      {
+        if (i < j)
+        {
+          hr = intervals.elementAt(++i);
+        }
         else
+        {
           i++;
+        }
         continue;
       }
-      int endshift=sr[0]+sr[1]; // deletion ranges - -ve means an insert
-      if (endshift<hr[0] || endshift<sr[0]) { // leadinghc disjoint or not a deletion
-        if (s<t)
-          sr=(int[]) deletions.elementAt(++s);
+      int endshift = sr[0] + sr[1]; // deletion ranges - -ve means an insert
+      if (endshift < hr[0] || endshift < sr[0])
+      { // leadinghc disjoint or not a deletion
+        if (s < t)
+        {
+          sr = shifts.get(++s);
+        }
         else
+        {
           s++;
+        }
         continue;
       }
-      boolean leadinghn=hr[0]>=sr[0];
-      boolean leadinghc=hr[0]<endshift;
-      boolean trailinghc=hr[1]<endshift;
-      if (leadinghn) {
-        if (trailinghc) {// deleted hidden region.
+      boolean leadinghn = hr[0] >= sr[0];
+      boolean leadinghc = hr[0] < endshift;
+      boolean trailinghc = hr[1] < endshift;
+      if (leadinghn)
+      {
+        if (trailinghc)
+        { // deleted hidden region.
           intervals.removeElementAt(i);
-          pruned=true;
+          pruned = true;
           j--;
-          if (i<=j)
-            hr=(int[]) intervals.elementAt(i);
+          if (i <= j)
+          {
+            hr = intervals.elementAt(i);
+          }
           continue;
         }
-        if (leadinghc) {
-          hr[0]=endshift; // clip c terminal region
-          leadinghn=!leadinghn;
-          pruned=true;
+        if (leadinghc)
+        {
+          hr[0] = endshift; // clip c terminal region
+          leadinghn = !leadinghn;
+          pruned = true;
         }
       }
-      if (!leadinghn) {
-        if (trailinghc) {
-          if (trailinghn) {
-            hr[1]=sr[0]-1;
-            pruned=true;
+      if (!leadinghn)
+      {
+        if (trailinghc)
+        {
+          if (trailinghn)
+          {
+            hr[1] = sr[0] - 1;
+            pruned = true;
           }
-        } else {
+        }
+        else
+        {
           // sr contained in hr
-          if (s<t)
-            sr=(int[]) deletions.elementAt(++s);
+          if (s < t)
+          {
+            sr = shifts.get(++s);
+          }
           else
+          {
             s++;
+          }
           continue;
         }
       }
     }
-    return pruned; // true if any interval was removed or modified by operations.
-  }
-  private boolean pruneColumnList(Vector deletion, Vector list) {
-    int s=0,t=deletion.size();
-    int[] sr=(int[])list.elementAt(s++);
-    boolean pruned=false;
-    int i=0, j=list.size();
-    while (i<j && s<=t) {
-      int c=((Integer)list.elementAt(i++)).intValue();
-      if (sr[0]<=c) {
-        if (sr[1]+sr[0]>=c) { // sr[1] -ve means inseriton.
-          list.removeElementAt(--i);
-          j--;
-        } else {
-          if (s<t)
-            sr = (int[])deletion.elementAt(s);
-          s++;
-        }
-      }
-    }
-    return pruned;
+    return pruned; // true if any interval was removed or modified by
+    // operations.
   }
+
   /**
-   * remove any hiddenColumns or selected columns and shift remaining
-   * based on a series of position, range deletions.
+   * remove any hiddenColumns or selected columns and shift remaining based on a
+   * series of position, range deletions.
+   * 
    * @param deletions
    */
-  public void pruneDeletions(ShiftList deletions) {
-    if (deletions!=null) {
-      Vector shifts=deletions.shifts;
-      if (shifts!=null && shifts.size()>0) {
+  public void pruneDeletions(ShiftList deletions)
+  {
+    if (deletions != null)
+    {
+      final List<int[]> shifts = deletions.getShifts();
+      if (shifts != null && shifts.size() > 0)
+      {
         // delete any intervals intersecting.
-        if (hiddenColumns!=null) {
+        if (hiddenColumns != null)
+        {
           pruneIntervalVector(shifts, hiddenColumns);
-          if (hiddenColumns!=null && hiddenColumns.size()==0) {
-            hiddenColumns=null;
+          if (hiddenColumns != null && hiddenColumns.size() == 0)
+          {
+            hiddenColumns = null;
           }
         }
-        if (selected!=null && selected.size()>0) {
-          pruneColumnList(shifts, selected);
-          if (selected!=null && selected.size()==0)
-            selected=null;
+        if (selected != null && selected.size() > 0)
+        {
+          selected.pruneColumnList(shifts);
+          if (selected != null && selected.size() == 0)
+          {
+            selected = null;
+          }
         }
         // and shift the rest.
         this.compensateForEdits(deletions);
       }
     }
   }
+
   /**
    * This Method is used to return all the HiddenColumn regions
-   * less than the given index.
-   * @param end int
-   * @return Vector
+   * 
+   * @return empty list or List of hidden column intervals
    */
-  public Vector getHiddenColumns()
+  public List<int[]> getHiddenColumns()
   {
-    return hiddenColumns;
+    return hiddenColumns == null ? Collections.<int[]> emptyList()
+            : hiddenColumns;
   }
+
   /**
    * Return absolute column index for a visible column index
-   * @param column int column index in alignment view
+   * 
+   * @param column
+   *          int column index in alignment view
    * @return alignment column index for column
    */
   public int adjustForHiddenColumns(int column)
@@ -400,7 +610,7 @@ public class ColumnSelection
     {
       for (int i = 0; i < hiddenColumns.size(); i++)
       {
-        int[] region = (int[]) hiddenColumns.elementAt(i);
+        int[] region = hiddenColumns.elementAt(i);
         if (result >= region[0])
         {
           result += region[1] - region[0] + 1;
@@ -411,9 +621,12 @@ public class ColumnSelection
   }
 
   /**
-   * Use this method to find out where a visible column is in the alignment
-   * when hidden columns exist
-   * @param hiddenColumn int
+   * Use this method to find out where a column will appear in the visible
+   * alignment when hidden columns exist. If the column is not visible, then the
+   * left-most visible column will always be returned.
+   * 
+   * @param hiddenColumn
+   *          int
    * @return int
    */
   public int findColumnPosition(int hiddenColumn)
@@ -422,26 +635,29 @@ public class ColumnSelection
     if (hiddenColumns != null)
     {
       int index = 0;
-      int gaps = 0;
+      int[] region;
       do
       {
-        int[] region = (int[]) hiddenColumns.elementAt(index);
+        region = hiddenColumns.elementAt(index++);
         if (hiddenColumn > region[1])
         {
-          result -= region[1]+1-region[0];
+          result -= region[1] + 1 - region[0];
         }
-        index++;
+      } while ((hiddenColumn > region[1]) && (index < hiddenColumns.size()));
+      if (hiddenColumn > region[0] && hiddenColumn < region[1])
+      {
+        return region[0] + hiddenColumn - result;
       }
-      while (index < hiddenColumns.size());
-
-      result -= gaps;
     }
-
-    return result;
+    return result; // return the shifted position after removing hidden columns.
   }
 
   /**
    * Use this method to determine where the next hiddenRegion starts
+   * 
+   * @param hiddenRegion
+   *          index of hidden region (counts from 0)
+   * @return column number in visible view
    */
   public int findHiddenRegionPosition(int hiddenRegion)
   {
@@ -452,17 +668,16 @@ public class ColumnSelection
       int gaps = 0;
       do
       {
-        int[] region = (int[]) hiddenColumns.elementAt(index);
-        if(hiddenRegion==0)
+        int[] region = hiddenColumns.elementAt(index);
+        if (hiddenRegion == 0)
         {
           return region[0];
         }
 
-        gaps +=  region[1] +1 - region[0];
-        result = region[1] +1;
+        gaps += region[1] + 1 - region[0];
+        result = region[1] + 1;
         index++;
-      }
-      while(index < hiddenRegion+1);
+      } while (index <= hiddenRegion);
 
       result -= gaps;
     }
@@ -471,10 +686,11 @@ public class ColumnSelection
   }
 
   /**
-   * THis method returns the rightmost limit of a
-   * region of an alignment with hidden columns.
-   * In otherwords, the next hidden column.
-   * @param index int
+   * THis method returns the rightmost limit of a region of an alignment with
+   * hidden columns. In otherwords, the next hidden column.
+   * 
+   * @param index
+   *          int
    */
   public int getHiddenBoundaryRight(int alPos)
   {
@@ -483,38 +699,42 @@ public class ColumnSelection
       int index = 0;
       do
       {
-        int[] region = (int[]) hiddenColumns.elementAt(index);
-        if(alPos < region[0])
+        int[] region = hiddenColumns.elementAt(index);
+        if (alPos < region[0])
+        {
           return region[0];
+        }
 
         index++;
-      }
-      while(index < hiddenColumns.size());
+      } while (index < hiddenColumns.size());
     }
 
     return alPos;
 
   }
+
   /**
-   * THis method returns the rightmost limit of a
-   * region of an alignment with hidden columns.
-   * In otherwords, the next hidden column.
-   * @param index int
+   * This method returns the leftmost limit of a region of an alignment with
+   * hidden columns. In otherwords, the previous hidden column.
+   * 
+   * @param index
+   *          int
    */
   public int getHiddenBoundaryLeft(int alPos)
   {
     if (hiddenColumns != null)
     {
-      int index = hiddenColumns.size()-1;
+      int index = hiddenColumns.size() - 1;
       do
       {
-        int[] region = (int[]) hiddenColumns.elementAt(index);
-        if(alPos > region[1])
+        int[] region = hiddenColumns.elementAt(index);
+        if (alPos > region[1])
+        {
           return region[1];
+        }
 
         index--;
-      }
-      while(index >-1);
+      } while (index > -1);
     }
 
     return alPos;
@@ -523,77 +743,128 @@ public class ColumnSelection
 
   public void hideSelectedColumns()
   {
-    while (size() > 0)
+    synchronized (selected)
     {
-      int column = ( (Integer) getSelected().firstElement()).intValue();
-      hideColumns(column);
+      for (int[] selregions : selected.getRanges())
+      {
+        hideColumns(selregions[0], selregions[1]);
+      }
+      selected.clear();
     }
 
   }
 
+  /**
+   * Adds the specified column range to the hidden columns
+   * 
+   * @param start
+   * @param end
+   */
   public void hideColumns(int start, int end)
   {
-    if(hiddenColumns==null)
-      hiddenColumns = new Vector();
-
-    boolean added = false;
-    boolean overlap = false;
+    if (hiddenColumns == null)
+    {
+      hiddenColumns = new Vector<int[]>();
+    }
 
+    /*
+     * traverse existing hidden ranges and insert / amend / append as
+     * appropriate
+     */
     for (int i = 0; i < hiddenColumns.size(); i++)
     {
-      int[] region = (int[]) hiddenColumns.elementAt(i);
-      if ( start<=region[1] && end>=region[0])
+      int[] region = hiddenColumns.elementAt(i);
+
+      if (end < region[0] - 1)
       {
-        hiddenColumns.removeElementAt(i);
-        overlap = true;
-        break;
+        /*
+         * insert discontiguous preceding range
+         */
+        hiddenColumns.insertElementAt(new int[] { start, end }, i);
+        return;
       }
-      else if (end < region[0] && start < region[0])
+
+      if (end <= region[1])
       {
-        hiddenColumns.insertElementAt(new int[]
-                                              {start, end}, i);
-        added = true;
-        break;
+        /*
+         * new range overlaps existing, or is contiguous preceding it - adjust
+         * start column
+         */
+        region[0] = Math.min(region[0], start);
+        return;
       }
-    }
 
-    if(overlap)
-    {
-      hideColumns(start, end);
+      if (start <= region[1] + 1)
+      {
+        /*
+         * new range overlaps existing, or is contiguous following it - adjust
+         * start and end columns
+         */
+        region[0] = Math.min(region[0], start);
+        region[1] = Math.max(region[1], end);
+        return;
+      }
     }
-    else if (!added)
-      hiddenColumns.addElement(new int[] {start, end});
 
+    /*
+     * remaining case is that the new range follows everything else
+     */
+    hiddenColumns.addElement(new int[] { start, end });
   }
 
   /**
-   * This method will find a range of selected columns
-   * around the column specified
-   * @param res int
+   * Hides the specified column and any adjacent selected columns
+   * 
+   * @param res
+   *          int
    */
   public void hideColumns(int col)
   {
-    // First find out range of columns to hide
-    int min = col, max = col+1;
-    while( contains(min) )
-    {  removeElement(min); min --;  }
+    /*
+     * deselect column (whether selected or not!)
+     */
+    removeElement(col);
+
+    /*
+     * find adjacent selected columns
+     */
+    int min = col - 1, max = col + 1;
+    while (contains(min))
+    {
+      removeElement(min);
+      min--;
+    }
 
-    while( contains(max) )
-    { removeElement(max);  max ++;  }
+    while (contains(max))
+    {
+      removeElement(max);
+      max++;
+    }
 
-    min++; max--;
+    /*
+     * min, max are now the closest unselected columns
+     */
+    min++;
+    max--;
+    if (min > max)
+    {
+      min = max;
+    }
 
     hideColumns(min, max);
   }
 
+  /**
+   * Unhides, and adds to the selection list, all hidden columns
+   */
   public void revealAllHiddenColumns()
   {
-    if(hiddenColumns!=null)
+    if (hiddenColumns != null)
     {
       for (int i = 0; i < hiddenColumns.size(); i++)
       {
-        int[] region = (int[]) hiddenColumns.elementAt(i);
-        for (int j = region[0]; j < region[1]+1; j++)
+        int[] region = hiddenColumns.elementAt(i);
+        for (int j = region[0]; j < region[1] + 1; j++)
         {
           addElement(j);
         }
@@ -603,14 +874,20 @@ public class ColumnSelection
     hiddenColumns = null;
   }
 
-  public void revealHiddenColumns(int res)
+  /**
+   * Reveals, and marks as selected, the hidden column range with the given
+   * start column
+   * 
+   * @param start
+   */
+  public void revealHiddenColumns(int start)
   {
-    for(int i=0; i<hiddenColumns.size(); i++)
+    for (int i = 0; i < hiddenColumns.size(); i++)
     {
-      int [] region = (int[])hiddenColumns.elementAt(i);
-      if( res == region[0])
+      int[] region = hiddenColumns.elementAt(i);
+      if (start == region[0])
       {
-        for (int j = region[0]; j < region[1]+1; j++)
+        for (int j = region[0]; j < region[1] + 1; j++)
         {
           addElement(j);
         }
@@ -619,48 +896,63 @@ public class ColumnSelection
         break;
       }
     }
-    if(hiddenColumns.size()==0)
+    if (hiddenColumns.size() == 0)
+    {
       hiddenColumns = null;
+    }
   }
 
   public boolean isVisible(int column)
   {
-    for(int i=0; i<hiddenColumns.size(); i++)
+    if (hiddenColumns != null)
     {
-      int [] region = (int[])hiddenColumns.elementAt(i);
-      if( column >= region[0] && column <= region[1])
+      for (int[] region : hiddenColumns)
       {
-        return false;
+        if (column >= region[0] && column <= region[1])
+        {
+          return false;
+        }
       }
     }
+
     return true;
   }
+
   /**
    * Copy constructor
+   * 
    * @param copy
    */
-  public ColumnSelection(ColumnSelection copy) {
-    if (copy!=null) {
-      if (copy.selected!=null) {
-        selected = new Vector();
-        for (int i=0,j=copy.selected.size(); i<j; i++) {
-          selected.setElementAt( ((Integer) copy.selected.elementAt(i)), i);
+  public ColumnSelection(ColumnSelection copy)
+  {
+    if (copy != null)
+    {
+      if (copy.selected != null)
+      {
+        selected = new IntList();
+        for (int i = 0, j = copy.selected.size(); i < j; i++)
+        {
+          selected.add(copy.selected.elementAt(i));
         }
       }
-      if (copy.hiddenColumns!=null) {
-        hiddenColumns=new Vector();
-        for (int i=0,j=copy.hiddenColumns.size(); i<j; i++) {
-          int[] rh,cp;
-          rh = (int[])copy.hiddenColumns.elementAt(i);
-          if (rh!=null) {
+      if (copy.hiddenColumns != null)
+      {
+        hiddenColumns = new Vector<int[]>(copy.hiddenColumns.size());
+        for (int i = 0, j = copy.hiddenColumns.size(); i < j; i++)
+        {
+          int[] rh, cp;
+          rh = copy.hiddenColumns.elementAt(i);
+          if (rh != null)
+          {
             cp = new int[rh.length];
             System.arraycopy(rh, 0, cp, 0, rh.length);
-            hiddenColumns.setElementAt(cp, i);
+            hiddenColumns.addElement(cp);
           }
         }
       }
     }
   }
+
   /**
    * ColumnSelection
    */
@@ -668,109 +960,648 @@ public class ColumnSelection
   {
   }
 
-  public String[] getVisibleSequenceStrings(int start, int end, SequenceI[] seqs) {
-    int i,iSize=seqs.length;
+  public String[] getVisibleSequenceStrings(int start, int end,
+          SequenceI[] seqs)
+  {
+    int i, iSize = seqs.length;
     String selection[] = new String[iSize];
-    if (hiddenColumns!=null && hiddenColumns.size()>0)
+    if (hiddenColumns != null && hiddenColumns.size() > 0)
     {
-      for (i=0; i<iSize; i++) {
+      for (i = 0; i < iSize; i++)
+      {
         StringBuffer visibleSeq = new StringBuffer();
-        Vector regions = getHiddenColumns();
+        List<int[]> regions = getHiddenColumns();
 
-        int blockStart = start, blockEnd=end;
-        int [] region;
+        int blockStart = start, blockEnd = end;
+        int[] region;
         int hideStart, hideEnd;
 
         for (int j = 0; j < regions.size(); j++)
         {
-          region = (int[]) regions.elementAt(j);
+          region = regions.get(j);
           hideStart = region[0];
           hideEnd = region[1];
 
-          if(hideStart < start)
+          if (hideStart < start)
           {
             continue;
           }
 
-          blockStart = Math.min(blockStart, hideEnd+1);
+          blockStart = Math.min(blockStart, hideEnd + 1);
           blockEnd = Math.min(blockEnd, hideStart);
 
-          if(blockStart>blockEnd)
+          if (blockStart > blockEnd)
           {
             break;
           }
 
-
           visibleSeq.append(seqs[i].getSequence(blockStart, blockEnd));
 
-          blockStart = hideEnd+1;
+          blockStart = hideEnd + 1;
           blockEnd = end;
         }
 
-        if(end>blockStart)
+        if (end > blockStart)
+        {
           visibleSeq.append(seqs[i].getSequence(blockStart, end));
+        }
 
         selection[i] = visibleSeq.toString();
       }
     }
     else
     {
-      for(i=0; i<iSize; i++)
+      for (i = 0; i < iSize; i++)
       {
-        selection[i] = seqs[i].getSequence(start, end);
+        selection[i] = seqs[i].getSequenceAsString(start, end);
       }
     }
 
     return selection;
   }
+
   /**
    * return all visible segments between the given start and end boundaries
    * 
-   * @param start (first column inclusive from 0)
-   * @param end (last column - not inclusive)
-   * @return int[] {i_start, i_end, ..} where intervals lie in start<=i_start<=i_end<end 
+   * @param start
+   *          (first column inclusive from 0)
+   * @param end
+   *          (last column - not inclusive)
+   * @return int[] {i_start, i_end, ..} where intervals lie in
+   *         start<=i_start<=i_end<end
    */
-  public int[] getVisibleContigs(int start, int end) {
-    if (hiddenColumns!=null && hiddenColumns.size()>0)
+  public int[] getVisibleContigs(int start, int end)
+  {
+    if (hiddenColumns != null && hiddenColumns.size() > 0)
     {
-      Vector visiblecontigs=new Vector();
-      Vector regions = getHiddenColumns();
+      List<int[]> visiblecontigs = new ArrayList<int[]>();
+      List<int[]> regions = getHiddenColumns();
 
       int vstart = start;
-      int [] region;
+      int[] region;
       int hideStart, hideEnd;
 
-      for (int j = 0; vstart<end && j < regions.size(); j++)
+      for (int j = 0; vstart < end && j < regions.size(); j++)
       {
-        region = (int[]) regions.elementAt(j);
+        region = regions.get(j);
         hideStart = region[0];
         hideEnd = region[1];
 
-        if(hideEnd < vstart)
+        if (hideEnd < vstart)
         {
           continue;
         }
-        if (hideStart>vstart) {
-          visiblecontigs.addElement(new int[] {vstart, hideStart-1});
+        if (hideStart > vstart)
+        {
+          visiblecontigs.add(new int[] { vstart, hideStart - 1 });
         }
-        vstart=hideEnd+1;
+        vstart = hideEnd + 1;
       }
 
-      if(vstart<end)
-        visiblecontigs.addElement(new int[] { vstart, end-1});
-      int[] vcontigs = new int[visiblecontigs.size()*2];
-      for (int i=0,j=visiblecontigs.size(); i<j; i++) {
-        int [] vc = (int[]) visiblecontigs.get(i);
-        visiblecontigs.setElementAt(null, i);
-        vcontigs[i*2] = vc[0];
-        vcontigs[i*2+1] = vc[1];
+      if (vstart < end)
+      {
+        visiblecontigs.add(new int[] { vstart, end - 1 });
+      }
+      int[] vcontigs = new int[visiblecontigs.size() * 2];
+      for (int i = 0, j = visiblecontigs.size(); i < j; i++)
+      {
+        int[] vc = visiblecontigs.get(i);
+        visiblecontigs.set(i, null);
+        vcontigs[i * 2] = vc[0];
+        vcontigs[i * 2 + 1] = vc[1];
       }
       visiblecontigs.clear();
       return vcontigs;
-    }     
+    }
     else
     {
-      return new int[] { start, end-1 };
+      return new int[] { start, end - 1 };
+    }
+  }
+
+  /**
+   * Locate the first and last position visible for this sequence. if seq isn't
+   * visible then return the position of the left and right of the hidden
+   * boundary region
+   * 
+   * @param seq
+   * @return int[] { visible start, visible end, first seqpos, last seqpos }
+   */
+  public int[] locateVisibleBoundsOfSequence(SequenceI seq)
+  {
+    int fpos=seq.getStart(),lpos= seq.getEnd();
+    int start = 0;
+    int end = seq.getLength();
+    
+    if (hiddenColumns == null || hiddenColumns.size() == 0)
+    {
+      return new int[] { seq.findIndex(fpos), seq.findIndex(lpos), fpos,
+          lpos };
+    }
+
+    // Simply walk along the sequence whilst watching for hidden column
+    // boundaries
+    List<int[]> regions = getHiddenColumns();
+    int spos = fpos, lastvispos = -1, rcount = 0, hideStart = seq
+            .getLength(), hideEnd = -1;
+    int visPrev = 0, visNext = 0, base = 0;
+    boolean foundStart = false;
+    for (int p = 0, pLen = seq.getLength(); spos <= seq.getEnd()
+            && p < pLen; p++)
+    {
+      if (!Comparison.isGap(seq.getCharAt(p)))
+      {
+        // update hidden region start/end
+        while (hideEnd < p && rcount < regions.size())
+        {
+          int[] region = regions.get(rcount++);
+          visNext += region[1] + 1 - region[0];
+          visPrev = visNext-1;
+          hideStart = region[0];
+          hideEnd = region[1];
+        }
+        if (hideEnd < p)
+        {
+          hideStart = seq.getLength();
+        }
+        // update visible boundary for sequence
+        if (p < hideStart)
+        {
+          if (!foundStart)
+          {
+            fpos = spos;
+            start = p;
+            foundStart = true;
+          }
+          lastvispos = p;
+          lpos = spos;
+        }
+        // look for next sequence position
+        spos++;
+      }
+    }
+    if (foundStart)
+    {
+      return new int[] { findColumnPosition(start),
+          findColumnPosition(lastvispos), fpos, lpos };
+    }
+    // otherwise, sequence was completely hidden
+    return new int[] { visPrev, visNext, 0, 0 };
+  }
+
+  /**
+   * delete any columns in alignmentAnnotation that are hidden (including
+   * sequence associated annotation).
+   * 
+   * @param alignmentAnnotation
+   */
+  public void makeVisibleAnnotation(AlignmentAnnotation alignmentAnnotation)
+  {
+    makeVisibleAnnotation(-1, -1, alignmentAnnotation);
+  }
+
+  /**
+   * delete any columns in alignmentAnnotation that are hidden (including
+   * sequence associated annotation).
+   * 
+   * @param start
+   *          remove any annotation to the right of this column
+   * @param end
+   *          remove any annotation to the left of this column
+   * @param alignmentAnnotation
+   *          the annotation to operate on
+   */
+  public void makeVisibleAnnotation(int start, int end,
+          AlignmentAnnotation alignmentAnnotation)
+  {
+    if (alignmentAnnotation.annotations == null)
+    {
+      return;
+    }
+    if (start == end && end == -1)
+    {
+      start = 0;
+      end = alignmentAnnotation.annotations.length;
+    }
+    if (hiddenColumns != null && hiddenColumns.size() > 0)
+    {
+      // then mangle the alignmentAnnotation annotation array
+      Vector<Annotation[]> annels = new Vector<Annotation[]>();
+      Annotation[] els = null;
+      List<int[]> regions = getHiddenColumns();
+      int blockStart = start, blockEnd = end;
+      int[] region;
+      int hideStart, hideEnd, w = 0;
+
+      for (int j = 0; j < regions.size(); j++)
+      {
+        region = regions.get(j);
+        hideStart = region[0];
+        hideEnd = region[1];
+
+        if (hideStart < start)
+        {
+          continue;
+        }
+
+        blockStart = Math.min(blockStart, hideEnd + 1);
+        blockEnd = Math.min(blockEnd, hideStart);
+
+        if (blockStart > blockEnd)
+        {
+          break;
+        }
+
+        annels.addElement(els = new Annotation[blockEnd - blockStart]);
+        System.arraycopy(alignmentAnnotation.annotations, blockStart, els,
+                0, els.length);
+        w += els.length;
+        blockStart = hideEnd + 1;
+        blockEnd = end;
+      }
+
+      if (end > blockStart)
+      {
+        annels.addElement(els = new Annotation[end - blockStart + 1]);
+        if ((els.length + blockStart) <= alignmentAnnotation.annotations.length)
+        {
+          // copy just the visible segment of the annotation row
+          System.arraycopy(alignmentAnnotation.annotations, blockStart,
+                  els, 0, els.length);
+        }
+        else
+        {
+          // copy to the end of the annotation row
+          System.arraycopy(alignmentAnnotation.annotations, blockStart,
+                  els, 0,
+                  (alignmentAnnotation.annotations.length - blockStart));
+        }
+        w += els.length;
+      }
+      if (w == 0)
+      {
+        return;
+      }
+
+      alignmentAnnotation.annotations = new Annotation[w];
+      w = 0;
+
+      for (Annotation[] chnk : annels)
+      {
+        System.arraycopy(chnk, 0, alignmentAnnotation.annotations, w,
+                chnk.length);
+        w += chnk.length;
+      }
+    }
+    else
+    {
+      alignmentAnnotation.restrict(start, end);
+    }
+  }
+
+  /**
+   * Invert the column selection from first to end-1. leaves hiddenColumns
+   * untouched (and unselected)
+   * 
+   * @param first
+   * @param end
+   */
+  public void invertColumnSelection(int first, int width)
+  {
+    boolean hasHidden = hiddenColumns != null && hiddenColumns.size() > 0;
+    for (int i = first; i < width; i++)
+    {
+      if (contains(i))
+      {
+        removeElement(i);
+      }
+      else
+      {
+        if (!hasHidden || isVisible(i))
+        {
+          addElement(i);
+        }
+      }
+    }
+  }
+
+  /**
+   * add in any unselected columns from the given column selection, excluding
+   * any that are hidden.
+   * 
+   * @param colsel
+   */
+  public void addElementsFrom(ColumnSelection colsel)
+  {
+    if (colsel != null && !colsel.isEmpty())
+    {
+      for (Integer col : colsel.getSelected())
+      {
+        if (hiddenColumns != null && isVisible(col.intValue()))
+        {
+          selected.add(col);
+        }
+      }
+    }
+  }
+
+  /**
+   * set the selected columns the given column selection, excluding any columns
+   * that are hidden.
+   * 
+   * @param colsel
+   */
+  public void setElementsFrom(ColumnSelection colsel)
+  {
+    selected = new IntList();
+    if (colsel.selected != null && colsel.selected.size() > 0)
+    {
+      if (hiddenColumns != null && hiddenColumns.size() > 0)
+      {
+        // only select visible columns in this columns selection
+        addElementsFrom(colsel);
+      }
+      else
+      {
+        // add everything regardless
+        for (Integer col : colsel.getSelected())
+        {
+          addElement(col);
+        }
+      }
     }
   }
+
+  /**
+   * Add gaps into the sequences aligned to profileseq under the given
+   * AlignmentView
+   * 
+   * @param profileseq
+   * @param al
+   *          - alignment to have gaps inserted into it
+   * @param input
+   *          - alignment view where sequence corresponding to profileseq is
+   *          first entry
+   * @return new Column selection for new alignment view, with insertions into
+   *         profileseq marked as hidden.
+   */
+  public static ColumnSelection propagateInsertions(SequenceI profileseq,
+          AlignmentI al, AlignmentView input)
+  {
+    int profsqpos = 0;
+
+    // return propagateInsertions(profileseq, al, )
+    char gc = al.getGapCharacter();
+    Object[] alandcolsel = input.getAlignmentAndColumnSelection(gc);
+    ColumnSelection nview = (ColumnSelection) alandcolsel[1];
+    SequenceI origseq = ((SequenceI[]) alandcolsel[0])[profsqpos];
+    nview.propagateInsertions(profileseq, al, origseq);
+    return nview;
+  }
+
+  /**
+   * 
+   * @param profileseq
+   *          - sequence in al which corresponds to origseq
+   * @param al
+   *          - alignment which is to have gaps inserted into it
+   * @param origseq
+   *          - sequence corresponding to profileseq which defines gap map for
+   *          modifying al
+   */
+  public void propagateInsertions(SequenceI profileseq, AlignmentI al,
+          SequenceI origseq)
+  {
+    char gc = al.getGapCharacter();
+    // recover mapping between sequence's non-gap positions and positions
+    // mapping to view.
+    pruneDeletions(ShiftList.parseMap(origseq.gapMap()));
+    int[] viscontigs = getVisibleContigs(0, profileseq.getLength());
+    int spos = 0;
+    int offset = 0;
+    // input.pruneDeletions(ShiftList.parseMap(((SequenceI[])
+    // alandcolsel[0])[0].gapMap()))
+    // add profile to visible contigs
+    for (int v = 0; v < viscontigs.length; v += 2)
+    {
+      if (viscontigs[v] > spos)
+      {
+        StringBuffer sb = new StringBuffer();
+        for (int s = 0, ns = viscontigs[v] - spos; s < ns; s++)
+        {
+          sb.append(gc);
+        }
+        for (int s = 0, ns = al.getHeight(); s < ns; s++)
+        {
+          SequenceI sqobj = al.getSequenceAt(s);
+          if (sqobj != profileseq)
+          {
+            String sq = al.getSequenceAt(s).getSequenceAsString();
+            if (sq.length() <= spos + offset)
+            {
+              // pad sequence
+              int diff = spos + offset - sq.length() - 1;
+              if (diff > 0)
+              {
+                // pad gaps
+                sq = sq + sb;
+                while ((diff = spos + offset - sq.length() - 1) > 0)
+                {
+                  // sq = sq
+                  // + ((diff >= sb.length()) ? sb.toString() : sb
+                  // .substring(0, diff));
+                  if (diff >= sb.length())
+                  {
+                    sq += sb.toString();
+                  }
+                  else
+                  {
+                    char[] buf = new char[diff];
+                    sb.getChars(0, diff, buf, 0);
+                    sq += buf.toString();
+                  }
+                }
+              }
+              sq += sb.toString();
+            }
+            else
+            {
+              al.getSequenceAt(s).setSequence(
+                      sq.substring(0, spos + offset) + sb.toString()
+                              + sq.substring(spos + offset));
+            }
+          }
+        }
+        // offset+=sb.length();
+      }
+      spos = viscontigs[v + 1] + 1;
+    }
+    if ((offset + spos) < profileseq.getLength())
+    {
+      // pad the final region with gaps.
+      StringBuffer sb = new StringBuffer();
+      for (int s = 0, ns = profileseq.getLength() - spos - offset; s < ns; s++)
+      {
+        sb.append(gc);
+      }
+      for (int s = 0, ns = al.getHeight(); s < ns; s++)
+      {
+        SequenceI sqobj = al.getSequenceAt(s);
+        if (sqobj == profileseq)
+        {
+          continue;
+        }
+        String sq = sqobj.getSequenceAsString();
+        // pad sequence
+        int diff = origseq.getLength() - sq.length();
+        while (diff > 0)
+        {
+          // sq = sq
+          // + ((diff >= sb.length()) ? sb.toString() : sb
+          // .substring(0, diff));
+          if (diff >= sb.length())
+          {
+            sq += sb.toString();
+          }
+          else
+          {
+            char[] buf = new char[diff];
+            sb.getChars(0, diff, buf, 0);
+            sq += buf.toString();
+          }
+          diff = origseq.getLength() - sq.length();
+        }
+      }
+    }
+  }
+
+  /**
+   * 
+   * @return true if there are columns marked
+   */
+  public boolean hasSelectedColumns()
+  {
+    return (selected != null && selected.size() > 0);
+  }
+
+  /**
+   * 
+   * @return true if there are columns hidden
+   */
+  public boolean hasHiddenColumns()
+  {
+    return hiddenColumns != null && hiddenColumns.size() > 0;
+  }
+
+  /**
+   * 
+   * @return true if there are more than one set of columns hidden
+   */
+  public boolean hasManyHiddenColumns()
+  {
+    return hiddenColumns != null && hiddenColumns.size() > 1;
+  }
+
+  /**
+   * mark the columns corresponding to gap characters as hidden in the column
+   * selection
+   * 
+   * @param sr
+   */
+  public void hideInsertionsFor(SequenceI sr)
+  {
+    List<int[]> inserts = sr.getInsertions();
+    for (int[] r : inserts)
+    {
+      hideColumns(r[0], r[1]);
+    }
+  }
+
+  public boolean filterAnnotations(Annotation[] annotations,
+          AnnotationFilterParameter filterParams)
+  {
+    // JBPNote - this method needs to be refactored to become independent of
+    // viewmodel package
+    this.revealAllHiddenColumns();
+    this.clear();
+    int count = 0;
+    do
+    {
+      if (annotations[count] != null)
+      {
+
+        boolean itemMatched = false;
+
+        if (filterParams.getThresholdType() == AnnotationFilterParameter.ThresholdType.ABOVE_THRESHOLD
+                && annotations[count].value >= filterParams
+                        .getThresholdValue())
+        {
+          itemMatched = true;
+        }
+        if (filterParams.getThresholdType() == AnnotationFilterParameter.ThresholdType.BELOW_THRESHOLD
+                && annotations[count].value <= filterParams
+                        .getThresholdValue())
+        {
+          itemMatched = true;
+        }
+
+        if (filterParams.isFilterAlphaHelix()
+                && annotations[count].secondaryStructure == 'H')
+        {
+          itemMatched = true;
+        }
+
+        if (filterParams.isFilterBetaSheet()
+                && annotations[count].secondaryStructure == 'E')
+        {
+          itemMatched = true;
+        }
+
+        if (filterParams.isFilterTurn()
+                && annotations[count].secondaryStructure == 'S')
+        {
+          itemMatched = true;
+        }
+
+        String regexSearchString = filterParams.getRegexString();
+        if (regexSearchString != null
+                && !filterParams.getRegexSearchFields().isEmpty())
+        {
+          List<SearchableAnnotationField> fields = filterParams
+                  .getRegexSearchFields();
+          try
+          {
+            if (fields.contains(SearchableAnnotationField.DISPLAY_STRING)
+                    && annotations[count].displayCharacter
+                            .matches(regexSearchString))
+            {
+              itemMatched = true;
+            }
+          } catch (java.util.regex.PatternSyntaxException pse)
+          {
+            if (annotations[count].displayCharacter
+                    .equals(regexSearchString))
+            {
+              itemMatched = true;
+            }
+          }
+          if (fields.contains(SearchableAnnotationField.DESCRIPTION)
+                  && annotations[count].description != null
+                  && annotations[count].description
+                          .matches(regexSearchString))
+          {
+            itemMatched = true;
+          }
+        }
+
+        if (itemMatched)
+        {
+          this.addElement(count);
+        }
+      }
+      count++;
+    } while (count < annotations.length);
+    return false;
+  }
+
 }