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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