diff -N SvtDaqMap.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ SvtDaqMap.java	10 Oct 2013 21:41:10 -0000	1.1
@@ -0,0 +1,58 @@

+package org.lcsim.hps.conditions.svt;
+
+import java.util.HashMap;
+
+import org.lcsim.hps.util.Pair;
+
+/**
+ * This class establishes the mapping between layer numbers and DAQ pair (FPGA, hybrid)
+ * for the top and bottom halves of the detector. 
+ * @author Jeremy McCormick <[log in to unmask]>
+ *
+ */
+public class SvtDaqMap {
+
+    /**
+     * Flag for top or bottom half of detector.
+     */
+    enum Half {
+        TOP,
+        BOTTOM
+    }
+  
+    /**
+     * This is the data structure used for the mapping of layer numbers to DAQ pair by top or bottom half.
+     */
+    static private class LayerMap extends HashMap<Half,HashMap<Integer,Pair<Integer,Integer>>> {        
+    }
+            
+    LayerMap layerMap = new LayerMap();
+    
+    /**
+     * Class constructor.
+     */
+    SvtDaqMap() {
+        layerMap.put(Half.TOP, new HashMap<Integer,Pair<Integer,Integer>>());
+        layerMap.put(Half.BOTTOM, new HashMap<Integer,Pair<Integer,Integer>>());
+    }
+     
+    /**
+     * Add a record to the DAQ map.
+     * @param half The value for top or bottom.
+     * @param layerNumber The layer number.
+     */
+    void add(Half half, int layerNumber, Pair<Integer,Integer> pair) {
+        layerMap.get(half).put(layerNumber, pair);
+    }
+    
+    /**
+     * Get a DAQ pair (FPGA, hybrid) by layer number.
+     * @param half Value indicating top or bottom half.
+     * @param layerNumber The layer number.
+     * @return The DAQ pair or null if does not exist.
+     */
+    Pair<Integer,Integer> get(Half half, int layerNumber) {
+        return layerMap.get(half).get(layerNumber);
+    }    
+    
+}