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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / CommandTrees / ExpressionBuilder / Internal / EnumerableValidator.cs / 1305376 / EnumerableValidator.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Collections.Generic; using System.Diagnostics; using System.Globalization; using System.Data.Metadata.Edm; // for TypeHelpers using System.Data.Common.CommandTrees; using System.Data.Common; using System.Data.Common.CommandTrees.Internal; using System.Linq; using System.Data.Common.Utils; namespace System.Data.Common.CommandTrees.ExpressionBuilder.Internal { ////// Validates an input enumerable argument with a specific element type, /// converting each input element into an instance of a specific output element type, /// then producing a final result of another specific type. /// ///The element type of the input enumerable ///The element type that input elements are converted to ///The type of the final result internal sealed class EnumerableValidator{ private readonly string argumentName; private readonly IEnumerable target; internal EnumerableValidator(IEnumerable argument, string argumentName) { this.argumentName = argumentName; this.target = argument; } private bool allowEmpty; private int expectedElementCount = -1; private Func map; private Func , TResult> collect; private Func
deriveName; /// /// Gets or sets a value that determines whether an exception is thrown if the enumerable argument is empty. /// ////// AllowEmpty is ignored if public bool AllowEmpty { get { return this.allowEmpty; } set { this.allowEmpty = value; } } ///is set. /// If ExpectedElementCount is set to zero, an empty collection will not cause an exception to be thrown, /// even if AllowEmpty is set to false . ////// Gets or set a value that determines the number of elements expected in the enumerable argument. /// A value of public int ExpectedElementCount { get { return this.expectedElementCount; } set { this.expectedElementCount = value; } } ///-1 indicates that any number of elements is permitted, including zero. /// Useto disallow an empty list when ExpectedElementCount is set to -1. /// /// Gets or sets the function used to convert an element from the enumerable argument into an instance of /// the desired output element type. The position of the input element is also specified as an argument to this function. /// public FuncConvertElement { get { return this.map; } set { this.map = value; } } /// /// Gets or sets the function used to create the output collection from a list of converted enumerable elements. /// public Func, TResult> CreateResult { get { return this.collect; } set { this.collect = value; } } ///
/// Gets or sets an optional function that can retrieve the name of an element from the enumerable argument. /// If this function is set, duplicate input element names will result in an exception. Null or empty names will /// not result in an exception. If specified, this function will be called after public Func. /// GetName { get { return this.deriveName; } set { this.deriveName = value; } } /// /// Validates the input enumerable, converting each input element and producing the final instance of ///as a result. /// The instance of ///produced by calling the function /// on the list of elements produced by calling the function on each element of the input enumerable. If the input enumerable itself is null ///If ///is a nullable type and any element of the input enumerable is null. If ///is set and the actual number of input elements is not equal to this value. If ///is -1, is set to false and the input enumerable is empty.If ///is set and a duplicate name is derived for more than one input element. Other exceptions may be thrown by the internal TResult Validate() { return EnumerableValidatorand functions, and by the function, if specified. .Validate(this.target, this.argumentName, this.ExpectedElementCount, this.AllowEmpty, this.ConvertElement, this.CreateResult, this.GetName); } private static TResult Validate(IEnumerable argument, string argumentName, int expectedElementCount, bool allowEmpty, Func map, Func , TResult> collect, Func
deriveName) { Debug.Assert(map != null, "Set EnumerableValidator.ConvertElement before calling validate"); Debug.Assert(collect != null, "Set EnumerableValidator.CreateResult before calling validate"); EntityUtil.CheckArgumentNull(argument, argumentName); bool checkNull = (default(TElementIn) == null); bool checkCount = (expectedElementCount != -1); Dictionary nameIndex = null; if (deriveName != null) { nameIndex = new Dictionary (); } int pos = 0; List validatedElements = new List (); foreach (TElementIn elementIn in argument) { // More elements in 'arguments' than expected? if (checkCount && pos == expectedElementCount) { throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_ExpressionList_IncorrectElementCount, argumentName); } if (checkNull && elementIn == null) { // Don't call FormatIndex unless an exception is actually being thrown throw EntityUtil.ArgumentNull(StringUtil.FormatIndex(argumentName, pos)); } TElementOut elementOut = map(elementIn, pos); validatedElements.Add(elementOut); if (deriveName != null) { string name = deriveName(elementIn, pos); Debug.Assert(name != null, "GetName should not produce null"); int foundIndex = -1; if (nameIndex.TryGetValue(name, out foundIndex)) { throw EntityUtil.Argument( System.Data.Entity.Strings.Cqt_Util_CheckListDuplicateName(foundIndex, pos, name), StringUtil.FormatIndex(argumentName, pos) ); } nameIndex[name] = pos; } pos++; } // If an expected count was specified, the actual count must match if (checkCount) { if (pos != expectedElementCount) { throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_ExpressionList_IncorrectElementCount, argumentName); } } else { // No expected count was specified, simply verify empty vs. non-empty. if (0 == pos && !allowEmpty) { throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Util_CheckListEmptyInvalid, argumentName); } } return collect(validatedElements); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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