ListArgumentProvider.cs source code in C# .NET

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Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Scripting / Ast / ListArgumentProvider.cs / 1305376 / ListArgumentProvider.cs

                            /* **************************************************************************** 
 *
 * Copyright (c) Microsoft Corporation.
 *
 * This source code is subject to terms and conditions of the Microsoft Public License. A 
 * copy of the license can be found in the License.html file at the root of this distribution. If
 * you cannot locate the  Microsoft Public License, please send an email to 
 * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 
 * by the terms of the Microsoft Public License.
 * 
 * You must not remove this notice, or any other, from this software.
 *
 *
 * ***************************************************************************/ 

using System; 
using System.Collections.Generic; 
using System.Text;
using System.Linq.Expressions; 
using System.Dynamic.Utils;

namespace System.Linq.Expressions {
    ///  
    /// Provides a wrapper around an IArgumentProvider which exposes the argument providers
    /// members out as an IList of Expression.  This is used to avoid allocating an array 
    /// which needs to be stored inside of a ReadOnlyCollection.  Instead this type has 
    /// the same amount of overhead as an array without duplicating the storage of the
    /// elements.  This ensures that internally we can avoid creating and copying arrays 
    /// while users of the Expression trees also don't pay a size penalty for this internal
    /// optimization.  See IArgumentProvider for more general information on the Expression
    /// tree optimizations being used here.
    ///  
    class ListArgumentProvider : IList {
        private readonly IArgumentProvider _provider; 
        private readonly Expression _arg0; 

        internal ListArgumentProvider(IArgumentProvider provider, Expression arg0) { 
            _provider = provider;
            _arg0 = arg0;
        }
 
        #region IList Members
 
        public int IndexOf(Expression item) { 
            if (_arg0 == item) {
                return 0; 
            }

            for (int i = 1; i < _provider.ArgumentCount; i++) {
                if (_provider.GetArgument(i) == item) { 
                    return i;
                } 
            } 

            return -1; 
        }

        public void Insert(int index, Expression item) {
            throw ContractUtils.Unreachable; 
        }
 
        public void RemoveAt(int index) { 
            throw ContractUtils.Unreachable;
        } 

        public Expression this[int index] {
            get {
                if (index == 0) { 
                    return _arg0;
                } 
 
                return _provider.GetArgument(index);
            } 
            set {
                throw ContractUtils.Unreachable;
            }
        } 

        #endregion 
 
        #region ICollection Members
 
        public void Add(Expression item) {
            throw ContractUtils.Unreachable;
        }
 
        public void Clear() {
            throw ContractUtils.Unreachable; 
        } 

        public bool Contains(Expression item) { 
            return IndexOf(item) != -1;
        }

        public void CopyTo(Expression[] array, int arrayIndex) { 
            array[arrayIndex++] = _arg0;
            for (int i = 1; i < _provider.ArgumentCount; i++) { 
                array[arrayIndex++] = _provider.GetArgument(i); 
            }
        } 

        public int Count {
            get { return _provider.ArgumentCount; }
        } 

        public bool IsReadOnly { 
            get { return true; } 
        }
 
        public bool Remove(Expression item) {
            throw ContractUtils.Unreachable;
        }
 
        #endregion
 
        #region IEnumerable Members 

        public IEnumerator GetEnumerator() { 
            yield return _arg0;

            for (int i = 1; i < _provider.ArgumentCount; i++) {
                yield return _provider.GetArgument(i); 
            }
        } 
 
        #endregion
 
        #region IEnumerable Members

        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
            yield return _arg0; 

            for (int i = 1; i < _provider.ArgumentCount; i++) { 
                yield return _provider.GetArgument(i); 
            }
        } 

        #endregion
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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