X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fdatamodel%2FVisibleColsCollection.java;h=cd812a19356fb3a7c54ed63b0a7a0e6a66b14a53;hb=a83adb45bdf9554e270921b4baad94defd314b36;hp=4ca51b5bdcfdf4f78eaf87942d5f08e5d8a5d876;hpb=d4ec118f86b5c9dee801e743c46aaacc7bb521d1;p=jalview.git

diff --git a/src/jalview/datamodel/VisibleColsCollection.java b/src/jalview/datamodel/VisibleColsCollection.java
index 4ca51b5..cd812a1 100644
--- a/src/jalview/datamodel/VisibleColsCollection.java
+++ b/src/jalview/datamodel/VisibleColsCollection.java
@@ -22,6 +22,7 @@ package jalview.datamodel;
 
 import jalview.api.AlignmentColsCollectionI;
 
+import java.util.BitSet;
 import java.util.Iterator;
 
 public class VisibleColsCollection implements AlignmentColsCollectionI
@@ -32,6 +33,8 @@ public class VisibleColsCollection implements AlignmentColsCollectionI
 
   HiddenColumns hidden;
 
+  private BitSet bsVisible;
+
   public VisibleColsCollection(int s, int e, HiddenColumns h)
   {
     start = s;
@@ -57,4 +60,27 @@ public class VisibleColsCollection implements AlignmentColsCollectionI
     return false;
   }
 
+  /**
+   * Only the visible columns.
+   */
+  @Override
+  public BitSet getOverviewBitSet()
+  {
+    if (bsVisible == null)
+    {
+      bsVisible = new BitSet(end + 1);
+    }
+    bsVisible.clear();
+    bsVisible.set(start, end + 1);
+    bsVisible.andNot(hidden.getBitset());
+
+    return bsVisible;
+  }
+
+  @Override
+  public BitSet getHiddenBitSet()
+  {
+    return new BitSet();
+  }
+
 }