mono/mcs/class/System.Core/System.Linq.Expressions/LambdaExpression.cs

// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
//
// Authors:
//        Atsushi Enomoto  <[email protected]>
//        Antonello Provenzano  <[email protected]>
//

using System;
using System.Collections.ObjectModel;

namespace System.Linq.Expressions
{
    public class LambdaExpression : Expression
    {
        #region .ctor
        internal LambdaExpression(Expression body, Type type, ReadOnlyCollection<ParameterExpression> parameters)
            : base(ExpressionType.Lambda, type)
        {
            this.body = body;
            this.parameters = parameters;
        }
        #endregion

        #region Fields
        private Expression body;
        private ReadOnlyCollection<ParameterExpression> parameters;
        #endregion

        #region Properties
        public Expression Body
        {
            get { return body; }
        }

        public ReadOnlyCollection<ParameterExpression> Parameters
        {
            get { return parameters; }
        }
        #endregion

        #region Internal Methods
        internal override void BuildString(System.Text.StringBuilder builder)
        {
            int parc = parameters.Count;

            if (parc > 1)
                builder.Append("(");

            for (int i = 0; i < parc; i++)
            {
                parameters[i].BuildString(builder);

                if (i < parc - 1)
                    builder.Append(", ");
            }

            if (parc > 1)
                builder.Append(")");

            builder.Append(" => ");
            body.BuildString(builder);
        }
        #endregion

        #region Public Methods
        public Delegate Compile()
        {
            //TODO: maybe we should call the ExpressionCompiler here...
            throw new NotImplementedException();
        }
        #endregion
    }
}