//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
 
namespace System.Activities
{
    using System.Runtime;
    using System.Runtime.Serialization;
 
    // Users of this class need to be VERY careful because TypedLocationWrapper
    // will happily wrap an inner location of any type.  This, however, could
    // cause an issue when attempting to get or set the value unless the inner
    // location's Type matches exactly.  If the use of the wrapper will be
    // constrained to either get or set then non-matching (but compatible) types
    // can be used.  One example of this is when wrapping a location for use
    // with an out argument.  Since out arguments buffer reads from their own
    // location, we know that only set will be called on this underlying
    // wrapper.
    [DataContract]
    class TypedLocationWrapper<T> : Location<T>
    {
        Location innerLocation;
 
        public TypedLocationWrapper(Location innerLocation)
            : base()
        {
            this.innerLocation = innerLocation;
        }
 
        internal override bool CanBeMapped
        {
            get
            {
                return this.innerLocation.CanBeMapped;
            }
        }
 
        public override T Value
        {
            get
            {
                return (T)this.innerLocation.Value;
            }
            set
            {
                this.innerLocation.Value = value;
            }
        }
 
        [DataMember(Name = "innerLocation")]
        internal Location SerializedInnerLocation
        {
            get { return this.innerLocation; }
            set { this.innerLocation = value; }
        }
 
        public override string ToString()
        {
            return this.innerLocation.ToString();
        }
    }
}