Avoid singletons; improve ToString()

This is part of a long-due series of source cleanup patches. ToString()
is no longer used for code generation (code generation is handled by an
ISpecWriter instance.) Enum is no longer public. EnumCollection now
exposes its backing store through an interface, rather than a concrete
class (simpler to change backing store in the future.)

Source/Bind/Structures/Enum.cs

@@ -15,7 +15,7 @@ namespace Bind.Structures
 {
     #region class Enum
 
-    public class Enum
+    class Enum
     {
         static StringBuilder translator = new StringBuilder();
         string _name, _type;
@@ -31,13 +31,13 @@ namespace Bind.Structures
             get { return _name ?? ""; }
             set { _name = value; }
         }
-		
-		// Typically 'long' or 'int'. Default is 'int'.
-		public string Type
-		{
-			get { return String.IsNullOrEmpty(_type) ? "int" : _type; }
-			set { _type = value; }
-		}
+
+        // Typically 'long' or 'int'. Default is 'int'.
+        public string Type
+        {
+            get { return String.IsNullOrEmpty(_type) ? "int" : _type; }
+            set { _type = value; }
+        }
 
         SortedDictionary<string, Constant> _constant_collection = new SortedDictionary<string, Constant>();
 
@@ -57,37 +57,13 @@ namespace Bind.Structures
             }
         }
 
-        [Obsolete("This code belongs to the various language-specific ISpecWriter implementations")]
+        // Use only for debugging, not for code generation.
         public override string ToString()
         {
-            StringBuilder sb = new StringBuilder();
-            List<Constant> constants = new List<Constant>(ConstantCollection.Values);
-            constants.Sort(delegate(Constant c1, Constant c2)
-            {
-                int ret = String.Compare(c1.Value, c2.Value);
-                if (ret == 0)
-                    return String.Compare(c1.Name, c2.Name);
-                return ret;
-            });
-
-            if (IsFlagCollection)
-                sb.AppendLine("[Flags]");
-            sb.Append("public enum ");
-			sb.Append(Name);
-			sb.Append(" : ");
-			sb.AppendLine(Type);
-            sb.AppendLine("{");
-
-            foreach (Constant c in constants)
-            {
-                sb.Append("    ");
-                sb.Append(c.ToString());
-                if (!String.IsNullOrEmpty(c.ToString()))
-                    sb.AppendLine(",");
-            }
-            sb.Append("}");
-
-            return sb.ToString();
+            return String.Format("enum {0} : {1} {{ {2} }}",
+                Name,
+                Type,
+                ConstantCollection);
         }
 
         public void Add(Constant constant)
@@ -100,8 +76,10 @@ namespace Bind.Structures
 
     #region class EnumCollection
 
-    public class EnumCollection : SortedDictionary<string, Enum>
+    class EnumCollection : IDictionary<string, Enum>
     {
+        SortedDictionary<string, Enum> Enumerations = new SortedDictionary<string, Enum>();
+
         internal void AddRange(EnumCollection enums)
         {
             foreach (Enum e in enums.Values)
@@ -138,10 +116,96 @@ namespace Bind.Structures
                 return 0;
         }
 
-        new bool TryGetValue(string key, out Enum value)
+        #region IDictionary<string, Enum> Members
+
+        public void Add(string key, Enum value)
         {
-            return base.TryGetValue(key, out value);
+            Enumerations.Add(key, value);
         }
+
+        public bool ContainsKey(string key)
+        {
+            return Enumerations.ContainsKey(key);
+        }
+
+        public ICollection<string> Keys
+        {
+            get { return Enumerations.Keys; }
+        }
+
+        public bool Remove(string key)
+        {
+            return Enumerations.Remove(key);
+        }
+
+        public bool TryGetValue(string key, out Enum value)
+        {
+            return Enumerations.TryGetValue(key, out value);
+        }
+
+        public ICollection<Enum> Values
+        {
+            get { return Enumerations.Values; }
+        }
+
+        public Enum this[string key]
+        {
+            get
+            {
+                return Enumerations[key];
+            }
+            set
+            {
+                Enumerations[key] = value;
+            }
+        }
+
+        public void Add(KeyValuePair<string, Enum> item)
+        {
+            Enumerations.Add(item.Key, item.Value);
+        }
+
+        public void Clear()
+        {
+            Enumerations.Clear();
+        }
+
+        public bool Contains(KeyValuePair<string, Enum> item)
+        {
+            return Enumerations.Contains(item);
+        }
+
+        public void CopyTo(KeyValuePair<string, Enum>[] array, int arrayIndex)
+        {
+            Enumerations.CopyTo(array, arrayIndex);
+        }
+
+        public int Count
+        {
+            get { return Enumerations.Count; }
+        }
+
+        public bool IsReadOnly
+        {
+            get { return (Enumerations as IDictionary<string, Enum>).IsReadOnly; }
+        }
+
+        public bool Remove(KeyValuePair<string, Enum> item)
+        {
+            return Enumerations.Remove(item.Key);
+        }
+
+        public IEnumerator<KeyValuePair<string, Enum>> GetEnumerator()
+        {
+            return Enumerations.GetEnumerator();
+        }
+
+        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
+        {
+            return Enumerations.GetEnumerator();
+        }
+
+        #endregion
     }
 
     #endregion