useful convenience function to get a genotype associated with a particular sample

git-svn-id: file:///humgen/gsa-scr1/gsa-engineering/svn_contents/trunk@2515 348d0f76-0448-11de-a6fe-93d51630548a

java/src/org/broadinstitute/sting/gatk/refdata/RodVCF.java

@@ -282,6 +282,16 @@ public class RodVCF extends BasicReferenceOrderedDatum implements VariationRod,
         return mCurrentRecord.getVCFGenotypeRecords();
     }
 
+    /**
+     * Returns the genotype associated with sample, or null if the genotype is missing
+     *
+     * @param sampleName the name of the sample genotype to fetch
+     * @return
+     */
+    public Genotype getGenotype(final String sampleName) {
+        return mCurrentRecord.getGenotype(sampleName);
+    }
+
     /**
      * do we have the specified genotype?  not all backedByGenotypes
      * have all the genotype data.