/IronPython_2_0/Src/IronPython/Runtime/Binding/SetMemberBinder.cs

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* Copyright (c) Microsoft Corporation. 

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* copy of the license can be found in the License.html file at the root of this distribution. If 

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using System; using Microsoft;

using Microsoft.Scripting;

using Microsoft.Scripting.Actions;

using Microsoft.Linq.Expressions;

using Microsoft.Scripting.Runtime;



using IronPython.Runtime.Binding;

using IronPython.Runtime.Operations;

using IronPython.Runtime.Types;



namespace IronPython.Runtime.Binding {

    using Ast = Microsoft.Linq.Expressions.Expression;



    class SetMemberBinder : SetMemberAction, IPythonSite, IExpressionSerializable {

        private readonly BinderState/*!*/ _state;



        public SetMemberBinder(BinderState/*!*/ binder, string/*!*/ name)

            : this(binder, name, false) {

        }



        public SetMemberBinder(BinderState/*!*/ binder, string/*!*/ name, bool caseInsensitive)

            : base(name, caseInsensitive) {

            _state = binder;

        }



        public override MetaObject Fallback(MetaObject self, MetaObject value, MetaObject onBindingError) {

            if (self.NeedsDeferral()) {

                return Defer(self, value);

            }



            return Binder.Binder.SetMember(Name, self, value, Ast.Constant(Binder.Context));

        }



        public BinderState/*!*/ Binder {

            get {

                return _state;

            }

        }



        public override object HashCookie {

            get { return this; }

        }



        public override int GetHashCode() {

            return base.GetHashCode() ^ _state.Binder.GetHashCode();

        }



        public override bool Equals(object obj) {

            SetMemberBinder ob = obj as SetMemberBinder;

            if (ob == null) {

                return false;

            }



            return ob._state.Binder == _state.Binder && base.Equals(obj);

        }



        public override string ToString() {

            return "Python SetMember " + Name;

        }



        #region IExpressionSerializable Members



        public Expression CreateExpression() {

            return Ast.Call(

                typeof(PythonOps).GetMethod("MakeSetAction"),

                BindingHelpers.CreateBinderStateExpression(),

                Ast.Constant(Name)

            );

        }



        #endregion

    }

}