//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.Activities
{
    using System;
    using System.Diagnostics.CodeAnalysis;
    using System.Runtime;

    public abstract class LocationReference
    {
        protected LocationReference()
        {
        }

        public string Name
        {
            get
            {
                return this.NameCore;
            }
        }

        [SuppressMessage(FxCop.Category.Naming, FxCop.Rule.PropertyNamesShouldNotMatchGetMethods,
            Justification = "Workflow normalizes on Type for Type properties")]
        public Type Type
        {
            get
            {
                return this.TypeCore;
            }
        }

        // internal Id use for arguments/variables/delegate arguments, and accessed
        // by our mapping pieces
        internal int Id
        {
            get;
            set;
        }

        protected abstract string NameCore { get; }
        protected abstract Type TypeCore { get; }

        // Soft-Link: This method is referenced through reflection by
        // ExpressionUtilities.TryRewriteLambdaExpression.  Update that
        // file if the signature changes.
        public abstract Location GetLocation(ActivityContext context);

        // The contract of this method is the caller promises never to write to the location
        internal virtual Location GetLocationForRead(ActivityContext context)
        {
            return GetLocation(context);
        }

        // The contract of this method is the caller promises never to read from the location
        internal virtual Location GetLocationForWrite(ActivityContext context)
        {
            return GetLocation(context);
        }
    }
}