diff -N Constants.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ Constants.java	9 Apr 2007 19:31:57 -0000	1.1
@@ -0,0 +1,87 @@

+package org.lcsim.units.clhep;
+
+import java.lang.reflect.Field;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.Map.Entry;
+
+/**
+ * Statically accessible version of CLHEP units and 
+ * physical constants.  Two methods are forwarded
+ * from Map.
+ * 
+ * @see #get(String)
+ * @see #entrySet()
+ * 
+ * The method 
+ * 
+ * @see #getInstance()
+ * 
+ * should be used to retrieve a static reference
+ * to this class.
+ *  
+ * @author Jeremy McCormick <[log in to unmask]>
+ *
+ */
+public class Constants 
+{
+    Map<String, Double> constantsMap = new HashMap<String, Double>();
+    
+    private static Constants instance = new Constants();
+    
+    public double get(String key)
+    {
+        return constantsMap.get(key);
+    }
+    
+    public Set<Entry<String,Double>> entrySet()
+    {
+        return constantsMap.entrySet();
+    }
+    
+    public static Constants getInstance()
+    {
+        return instance;
+    }
+    
+    private Constants()
+    {
+        setupSystemOfUnits();
+        setupPhysicalConstants();
+    }
+    
+    private void setupSystemOfUnits()
+    {
+        SystemOfUnits units = new SystemOfUnits();      
+        Class<SystemOfUnits> klass = SystemOfUnits.class;
+        Field[] fields = klass.getFields();
+        for (Field f : fields)
+        {
+            try {
+                constantsMap.put(f.getName(), f.getDouble(units));
+            }
+            catch ( IllegalAccessException x )
+            {
+                throw new RuntimeException(x);
+            }
+        }
+    }
+    
+    private void setupPhysicalConstants()
+    {
+        PhysicalConstants units = new PhysicalConstants();      
+        Class<SystemOfUnits> klass = SystemOfUnits.class;
+        Field[] fields = klass.getFields();
+        for (Field f : fields)
+        {
+            try {
+                constantsMap.put(f.getName(), f.getDouble(units));
+            }
+            catch ( IllegalAccessException x )
+            {
+                throw new RuntimeException(x);
+            }
+        }
+    }    
+}

\ No newline at end of file