X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fdatamodel%2FSequenceI.java;h=92f797ff7757f726e7681a3f3a18ce339fe52809;hb=c437fc72420baf7b045d417fb6cabcebe87987c5;hp=a29e2ba81c2f34491c2e806cda561242c42efd93;hpb=1c5971e6df15c0d5c774a2cb7dbdac286a72a9b2;p=jalview.git

diff --git a/src/jalview/datamodel/SequenceI.java b/src/jalview/datamodel/SequenceI.java
index a29e2ba..92f797f 100755
--- a/src/jalview/datamodel/SequenceI.java
+++ b/src/jalview/datamodel/SequenceI.java
@@ -217,8 +217,11 @@ public interface SequenceI extends ASequenceI
   public int[] findPositionMap();
 
   /**
+   * Answers true if the sequence is composed of amino acid characters. Note
+   * that implementations may use heuristic methods which are not guaranteed to
+   * give the biologically 'right' answer.
    * 
-   * @return true if sequence is composed of amino acid characters
+   * @return
    */
   public boolean isProtein();
 
@@ -334,7 +337,14 @@ public interface SequenceI extends ASequenceI
    */
   public void addDBRef(DBRefEntry entry);
 
-  public void addSequenceFeature(SequenceFeature sf);
+  /**
+   * Adds the given sequence feature and returns true, or returns false if it is
+   * already present on the sequence
+   * 
+   * @param sf
+   * @return
+   */
+  public boolean addSequenceFeature(SequenceFeature sf);
 
   public void deleteFeature(SequenceFeature sf);
 
@@ -456,7 +466,6 @@ public interface SequenceI extends ASequenceI
    */
   public PDBEntry getPDBEntry(String pdbId);
 
-
   /**
    * Get all primary database/accessions for this sequence's data. These
    * DBRefEntry are expected to resolve to a valid record in the associated