diff --git a/java/src/org/broadinstitute/sting/gatk/dataSources/providers/LocusContextQueue.java b/java/src/org/broadinstitute/sting/gatk/dataSources/providers/LocusContextQueue.java
new file mode 100755
index 000000000..44142b501
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+++ b/java/src/org/broadinstitute/sting/gatk/dataSources/providers/LocusContextQueue.java
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+package org.broadinstitute.sting.gatk.dataSources.providers;
+
+import org.broadinstitute.sting.gatk.LocusContext;
+import org.broadinstitute.sting.utils.GenomeLoc;
+/**
+ * User: hanna
+ * Date: May 13, 2009
+ * Time: 3:30:16 PM
+ * BROAD INSTITUTE SOFTWARE COPYRIGHT NOTICE AND AGREEMENT
+ * Software and documentation are copyright 2005 by the Broad Institute.
+ * All rights are reserved.
+ *
+ * Users acknowledge that this software is supplied without any warranty or support.
+ * The Broad Institute is not responsible for its use, misuse, or
+ * functionality.
+ */
+
+/**
+ * A queue of locus context entries.
+ */
+
+public interface LocusContextQueue {
+    /**
+     * Get the locus context at the given position.
+     * @return Locus context, or null if no locus context exists at this position.
+     */
+    LocusContext peek();
+
+    /**
+     * Seek to the given point the queue of locus contexts.
+     * @param target Target base pair to which to seek.  Must be a single base pair.
+     * @return an instance of itself for parameter chaining.
+     */
+    public LocusContextQueue seek(GenomeLoc target);
+}