X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fdatamodel%2FAnnotation.java;h=ae2941786fd442b26ddfe6ee854775e08a5ec4a6;hb=d156987a513b1da92fd6fbf7678b4a8e7ffc8d08;hp=71ebbb3f87daff70034c35427fc428fa7dd1e7fc;hpb=37de9310bec3501cbc6381e0c3dcb282fcaad812;p=jalview.git

diff --git a/src/jalview/datamodel/Annotation.java b/src/jalview/datamodel/Annotation.java
index 71ebbb3..ae29417 100755
--- a/src/jalview/datamodel/Annotation.java
+++ b/src/jalview/datamodel/Annotation.java
@@ -30,6 +30,12 @@ import java.awt.Color;
  */
 public class Annotation
 {
+  /**
+   * the empty annotation - proxy for null entries in annotation row
+   */
+  public static final Annotation EMPTY_ANNOTATION = new Annotation("", "",
+          ' ', 0f);
+
   /** Character label - also shown below histogram */
   public String displayCharacter = "";
 
@@ -45,7 +51,9 @@ public class Annotation
    */
   public char secondaryStructure = ' ';
 
-  /** Score for the position - used in histograms, line graphs and for shading */
+  /**
+   * Score for the position - used in histograms, line graphs and for shading
+   */
   public float value;
 
   /** Colour for position */
@@ -192,4 +200,18 @@ public class Annotation
     }
     return sb.toString();
   }
+
+  /**
+   * @return true if annot is 'whitespace' annotation (zero score, whitespace or
+   *         zero length display character, label, description
+   */
+  public boolean isWhitespace()
+  {
+    return ((value == 0f)
+            && ((description == null) || (description.trim().length() == 0))
+            && ((displayCharacter == null)
+                    || (displayCharacter.trim().length() == 0))
+            && (secondaryStructure == '\0' || (secondaryStructure == ' '))
+            && colour == null);
+  }
 }