Symbol.cs

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/*++
Copyright (c) 2012 Microsoft Corporation
 
Module Name:
 
    Symbol.cs
 
Abstract:
 
    Z3 Managed API: Symbols
 
Author:
 
    Christoph Wintersteiger (cwinter) 2012-03-16
 
Notes:
    
--*/
 
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
 
namespace Microsoft.Z3
{
    public class Symbol : Z3Object
    {
        protected Z3_symbol_kind Kind
        {
            get { return (Z3_symbol_kind)Native.Z3_get_symbol_kind(Context.nCtx, NativeObject); }
        }
 
        public bool IsIntSymbol()
        {
            return Kind == Z3_symbol_kind.Z3_INT_SYMBOL;
        }
 
        public bool IsStringSymbol()
        {
            return Kind == Z3_symbol_kind.Z3_STRING_SYMBOL;
        }
 
        public override string ToString()
        {
            if (IsIntSymbol())
                return ((IntSymbol)this).Int.ToString();
            else if (IsStringSymbol())
                return ((StringSymbol)this).String;
            else
                throw new Z3Exception("Unknown symbol kind encountered");
        }
 
 
        public static bool operator ==(Symbol s1, Symbol s2)
        {
            
            return Object.ReferenceEquals(s1, s2) ||
                   (!Object.ReferenceEquals(s1, null) &&
                    !Object.ReferenceEquals(s2, null) &&
                    s1.NativeObject == s2.NativeObject);
        }
 
        public static bool operator !=(Symbol s1, Symbol s2)
        {
            return !(s1 == s2);
        }
 
        public override bool Equals(object o)
        {
            Symbol casted = o as Symbol;
            if (casted == null) return false;
            return this == casted;
        }
 
        public override int GetHashCode()
        {
            if (IsIntSymbol())
                return ((IntSymbol)this).Int;
            else 
                return ((StringSymbol)this).String.GetHashCode();
        }
 
 
        #region Internal
        internal protected Symbol(Context ctx, IntPtr obj) : base(ctx, obj) 
        {
            Debug.Assert(ctx != null);
        }
 
        internal static Symbol Create(Context ctx, IntPtr obj)
        {
            Debug.Assert(ctx != null);
 
            switch ((Z3_symbol_kind)Native.Z3_get_symbol_kind(ctx.nCtx, obj))
            {
                case Z3_symbol_kind.Z3_INT_SYMBOL: return new IntSymbol(ctx, obj);
                case Z3_symbol_kind.Z3_STRING_SYMBOL: return new StringSymbol(ctx, obj);
                default:
                    throw new Z3Exception("Unknown symbol kind encountered");
            }
        }
        #endregion
    }
}