X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fanalysis%2FAlignmentUtils.java;h=929a855a0a5dea3434d5a86b812406b5d80d016e;hb=ec493e27abc6b3be84b3c8a873c295a3f589bd53;hp=2feeb919a3d7791c74584018f69e26b493371ec0;hpb=8ba65cbf8dde2faeff8a84eae78127fb99b765a5;p=jalview.git

diff --git a/src/jalview/analysis/AlignmentUtils.java b/src/jalview/analysis/AlignmentUtils.java
index 2feeb91..929a855 100644
--- a/src/jalview/analysis/AlignmentUtils.java
+++ b/src/jalview/analysis/AlignmentUtils.java
@@ -20,12 +20,12 @@
  */
 package jalview.analysis;
 
+import jalview.datamodel.AlignmentI;
+import jalview.datamodel.SequenceI;
+
 import java.util.ArrayList;
 import java.util.List;
 
-import jalview.datamodel.SequenceI;
-import jalview.datamodel.AlignmentI;
-
 /**
  * grab bag of useful alignment manipulation operations Expect these to be
  * refactored elsewhere at some point.
@@ -124,4 +124,28 @@ public class AlignmentUtils
     newAl.setDataset(core.getDataset());
     return newAl;
   }
+
+  /**
+   * Returns the index (zero-based position) of a sequence in an alignment, or
+   * -1 if not found.
+   * 
+   * @param al
+   * @param seq
+   * @return
+   */
+  public static int getSequenceIndex(AlignmentI al, SequenceI seq)
+  {
+    int result = -1;
+    int pos = 0;
+    for (SequenceI alSeq : al.getSequences())
+    {
+      if (alSeq == seq)
+      {
+        result = pos;
+        break;
+      }
+      pos++;
+    }
+    return result;
+  }
 }