Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataWebControls / System / Data / WebControls / OrderByBuilder.cs / 1305376 / OrderByBuilder.cs
using System.Collections; using System.Collections.Generic; using System.Collections.Specialized; using System.Data.Metadata.Edm; using System.Data.Objects; using System.Diagnostics; using System.Linq; using System.Linq.Expressions; using System.Text; namespace System.Web.UI.WebControls { internal class OrderByBuilder { private readonly string _argsSortExpression; private readonly EntityDataSourceWrapperCollection _wrapperCollection; private readonly string _orderBy; private readonly bool _autoGenerateOrderByClause; private readonly ParameterCollection _orderByParameters; private readonly EntityDataSource _owner; private readonly bool _generateDefaultOrderByClause; internal OrderByBuilder(string argsSortExpression, EntityDataSourceWrapperCollection wrapperCollection, string orderBy, bool autoGenerateOrderByClause, ParameterCollection orderByParameters, bool generateDefaultOrderByClause, EntityDataSource owner) { _argsSortExpression = argsSortExpression; _wrapperCollection = wrapperCollection; _orderBy = orderBy; _autoGenerateOrderByClause = autoGenerateOrderByClause; _orderByParameters = orderByParameters; _owner = owner; _generateDefaultOrderByClause = generateDefaultOrderByClause; } internal void Generate(TypeUsage tu, out string orderBy, out ObjectParameter[] orderByParameters, bool applySortExpression) { Debug.Assert(null != tu, "Type Usage cannot be null"); GenerateOrderByClause(tu, out orderBy, out orderByParameters, applySortExpression); } private void GenerateOrderByClause(TypeUsage tu, out string orderByClause, out ObjectParameter[] orderByObjectParameters, bool applySortExpression) { var orderByClauseBuilder = new StringBuilder(); if (applySortExpression) { // This sets the orderBy clause based on a clicked column header in the databound control. AppendOrderByKey(orderByClauseBuilder, _argsSortExpression, Strings.EntityDataSourceView_ColumnHeader, tu); } // AutoGenerateOrderByClause is mutually exclusive with OrderBy. // Only one of the following two if statements will execute. if (_autoGenerateOrderByClause) { Debug.Assert(String.IsNullOrEmpty(_orderBy), "If AutoGenerateOrderByClause is true, then OrderBy cannot be set. This should have been caught by a runtime error check"); IOrderedDictionary paramValues = _orderByParameters.GetValues(_owner.HttpContext, _owner); foreach (DictionaryEntry de in paramValues) { // Skip AutoGenerateOrderBy on expressions that have a null value. if (!string.IsNullOrEmpty((string)(de.Value))) { if (0 < orderByClauseBuilder.Length) { orderByClauseBuilder.Append(", "); } AppendOrderByKey(orderByClauseBuilder, (string)(de.Value), Strings.EntityDataSourceView_AutoGenerateOrderByParameters, tu); } } } // Append the OrderBy expression, if it's nonzero length. if (!String.IsNullOrEmpty(_orderBy)) { orderByObjectParameters = _owner.GetOrderByParameters(); Debug.Assert(!_autoGenerateOrderByClause, "If OrderBy is set, AutoGenerateOrderBy must be false. This should have been caught by a runtime error check"); if (0 < orderByClauseBuilder.Length) { orderByClauseBuilder.Append(", "); } orderByClauseBuilder.Append(_orderBy); } else { orderByObjectParameters = new ObjectParameter[] { }; } if (orderByClauseBuilder.Length==0 && _generateDefaultOrderByClause) { // This only occurs if there's no EntitySet, which means entities are not wrapped. orderByClauseBuilder.Append(GenerateDefaultOrderByFromTypeUsage(tu)); } orderByClause = orderByClauseBuilder.ToString(); } private void AppendOrderByKey(StringBuilder orderByClauseBuilder, string expression, string errorText, TypeUsage tu) { if (!String.IsNullOrEmpty(expression)) { string[] statements = expression.Split(','); string spacer = String.Empty; foreach (string statement in statements) { bool isAscending = true; string columnName = ParseStatement(statement.Trim(), out isAscending); if (String.IsNullOrEmpty(columnName)) { throw new ArgumentException(Strings.EntityDataSourceView_EmptyPropertyName); } if (EntityDataSourceUtil.PropertyIsOnEntity(columnName, _wrapperCollection, null, tu)) { orderByClauseBuilder.Append(spacer); orderByClauseBuilder.Append(EntityDataSourceUtil.GetEntitySqlValueForColumnName(columnName, _wrapperCollection)); } else // pass the sort expression through verbatim. { if (!columnName.StartsWith("it.", StringComparison.OrdinalIgnoreCase)) { columnName = "it." + columnName; } orderByClauseBuilder.Append(spacer + columnName); } if (!isAscending) { orderByClauseBuilder.Append(c_esqlDescendingTail); } spacer = ","; } } } private const string c_esqlAscendingTail = " ASC"; private const string c_esqlDescendingTail = " DESC"; private static readonly string[] ascendingTails = new string[] { c_esqlAscendingTail, " ascending" }; private static readonly string[] descendingTails = new string[] { c_esqlDescendingTail, " descending" }; private static string ParseStatement(string statement, out bool isAscending) { foreach (string tail in descendingTails) { if (statement.EndsWith(tail, StringComparison.OrdinalIgnoreCase)) { isAscending = false; return statement.Substring(0, statement.Length - tail.Length); } } foreach (string tail in ascendingTails) { if (statement.EndsWith(tail, StringComparison.OrdinalIgnoreCase)) { isAscending = true; return statement.Substring(0, statement.Length - tail.Length); } } isAscending = true; return statement; } private static IQueryable ExpandQueryableOrderBy(IQueryable source, string[] statements) { var expression = source.Expression; var parameter = Expression.Parameter(source.ElementType, String.Empty); for (int idx = 0; idx < statements.Length; idx++) { bool isAscending = true; // Try LINQ ascending/descending suffix string memberReference = ParseStatement(statements[idx], out isAscending); bool isFirstOrderBy = (idx == 0); var methodName = (isFirstOrderBy ? "OrderBy" : "ThenBy") + (isAscending ? String.Empty : "Descending"); // Unravel nested property accesses var memberElements = memberReference.Split('.'); Expression memberExpression = parameter; foreach (string memberElement in memberElements) { if (string.IsNullOrEmpty(memberElement)) { throw new ArgumentException(Strings.EntityDataSourceView_EmptyPropertyName); } memberExpression = Expression.Property(memberExpression, memberElement.Trim()); } expression = Expression.Call(typeof(Queryable), methodName, new Type[] { source.ElementType, memberExpression.Type }, new Expression[] { expression, Expression.Quote(DynamicExpression.Lambda(memberExpression, parameter)) }); } return source.Provider.CreateQuery(expression); } internal IQueryableBuildQueryableOrderBy (IQueryable source) { IQueryable query = source; // Process control's sort arguments if there are any if (_argsSortExpression != null & _argsSortExpression.Trim().Length > 0) { string[] statements = _argsSortExpression.Split(','); if (statements.Length > 0) { query = ExpandQueryableOrderBy(query, statements); } } return query as IQueryable ; } private static string GenerateDefaultOrderByFromTypeUsage(TypeUsage tu) { StringBuilder orderByBuilder = new StringBuilder(); ReadOnlyMetadataCollection propertyCollection; List keyMemberNames = null; EntityType entityType = tu.EdmType as EntityType; if (null != entityType) { ReadOnlyMetadataCollection keyMembers; keyMembers = entityType.KeyMembers; keyMemberNames = new List (entityType.KeyMembers.Count); propertyCollection = entityType.Properties; foreach (EdmMember edmMember in keyMembers) { keyMemberNames.Add(edmMember.Name); } } else { return String.Empty; } foreach (EdmProperty property in propertyCollection) { if (keyMemberNames.Contains(property.Name) && property.TypeUsage.EdmType.BuiltInTypeKind == BuiltInTypeKind.PrimitiveType) { if (0 < orderByBuilder.Length) { orderByBuilder.Append(", "); } orderByBuilder.Append(EntityDataSourceUtil.EntitySqlElementAlias); orderByBuilder.Append("."); orderByBuilder.Append(EntityDataSourceUtil.QuoteEntitySqlIdentifier(property.Name)); } } return orderByBuilder.ToString(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. using System.Collections; using System.Collections.Generic; using System.Collections.Specialized; using System.Data.Metadata.Edm; using System.Data.Objects; using System.Diagnostics; using System.Linq; using System.Linq.Expressions; using System.Text; namespace System.Web.UI.WebControls { internal class OrderByBuilder { private readonly string _argsSortExpression; private readonly EntityDataSourceWrapperCollection _wrapperCollection; private readonly string _orderBy; private readonly bool _autoGenerateOrderByClause; private readonly ParameterCollection _orderByParameters; private readonly EntityDataSource _owner; private readonly bool _generateDefaultOrderByClause; internal OrderByBuilder(string argsSortExpression, EntityDataSourceWrapperCollection wrapperCollection, string orderBy, bool autoGenerateOrderByClause, ParameterCollection orderByParameters, bool generateDefaultOrderByClause, EntityDataSource owner) { _argsSortExpression = argsSortExpression; _wrapperCollection = wrapperCollection; _orderBy = orderBy; _autoGenerateOrderByClause = autoGenerateOrderByClause; _orderByParameters = orderByParameters; _owner = owner; _generateDefaultOrderByClause = generateDefaultOrderByClause; } internal void Generate(TypeUsage tu, out string orderBy, out ObjectParameter[] orderByParameters, bool applySortExpression) { Debug.Assert(null != tu, "Type Usage cannot be null"); GenerateOrderByClause(tu, out orderBy, out orderByParameters, applySortExpression); } private void GenerateOrderByClause(TypeUsage tu, out string orderByClause, out ObjectParameter[] orderByObjectParameters, bool applySortExpression) { var orderByClauseBuilder = new StringBuilder(); if (applySortExpression) { // This sets the orderBy clause based on a clicked column header in the databound control. AppendOrderByKey(orderByClauseBuilder, _argsSortExpression, Strings.EntityDataSourceView_ColumnHeader, tu); } // AutoGenerateOrderByClause is mutually exclusive with OrderBy. // Only one of the following two if statements will execute. if (_autoGenerateOrderByClause) { Debug.Assert(String.IsNullOrEmpty(_orderBy), "If AutoGenerateOrderByClause is true, then OrderBy cannot be set. This should have been caught by a runtime error check"); IOrderedDictionary paramValues = _orderByParameters.GetValues(_owner.HttpContext, _owner); foreach (DictionaryEntry de in paramValues) { // Skip AutoGenerateOrderBy on expressions that have a null value. if (!string.IsNullOrEmpty((string)(de.Value))) { if (0 < orderByClauseBuilder.Length) { orderByClauseBuilder.Append(", "); } AppendOrderByKey(orderByClauseBuilder, (string)(de.Value), Strings.EntityDataSourceView_AutoGenerateOrderByParameters, tu); } } } // Append the OrderBy expression, if it's nonzero length. if (!String.IsNullOrEmpty(_orderBy)) { orderByObjectParameters = _owner.GetOrderByParameters(); Debug.Assert(!_autoGenerateOrderByClause, "If OrderBy is set, AutoGenerateOrderBy must be false. This should have been caught by a runtime error check"); if (0 < orderByClauseBuilder.Length) { orderByClauseBuilder.Append(", "); } orderByClauseBuilder.Append(_orderBy); } else { orderByObjectParameters = new ObjectParameter[] { }; } if (orderByClauseBuilder.Length==0 && _generateDefaultOrderByClause) { // This only occurs if there's no EntitySet, which means entities are not wrapped. orderByClauseBuilder.Append(GenerateDefaultOrderByFromTypeUsage(tu)); } orderByClause = orderByClauseBuilder.ToString(); } private void AppendOrderByKey(StringBuilder orderByClauseBuilder, string expression, string errorText, TypeUsage tu) { if (!String.IsNullOrEmpty(expression)) { string[] statements = expression.Split(','); string spacer = String.Empty; foreach (string statement in statements) { bool isAscending = true; string columnName = ParseStatement(statement.Trim(), out isAscending); if (String.IsNullOrEmpty(columnName)) { throw new ArgumentException(Strings.EntityDataSourceView_EmptyPropertyName); } if (EntityDataSourceUtil.PropertyIsOnEntity(columnName, _wrapperCollection, null, tu)) { orderByClauseBuilder.Append(spacer); orderByClauseBuilder.Append(EntityDataSourceUtil.GetEntitySqlValueForColumnName(columnName, _wrapperCollection)); } else // pass the sort expression through verbatim. { if (!columnName.StartsWith("it.", StringComparison.OrdinalIgnoreCase)) { columnName = "it." + columnName; } orderByClauseBuilder.Append(spacer + columnName); } if (!isAscending) { orderByClauseBuilder.Append(c_esqlDescendingTail); } spacer = ","; } } } private const string c_esqlAscendingTail = " ASC"; private const string c_esqlDescendingTail = " DESC"; private static readonly string[] ascendingTails = new string[] { c_esqlAscendingTail, " ascending" }; private static readonly string[] descendingTails = new string[] { c_esqlDescendingTail, " descending" }; private static string ParseStatement(string statement, out bool isAscending) { foreach (string tail in descendingTails) { if (statement.EndsWith(tail, StringComparison.OrdinalIgnoreCase)) { isAscending = false; return statement.Substring(0, statement.Length - tail.Length); } } foreach (string tail in ascendingTails) { if (statement.EndsWith(tail, StringComparison.OrdinalIgnoreCase)) { isAscending = true; return statement.Substring(0, statement.Length - tail.Length); } } isAscending = true; return statement; } private static IQueryable ExpandQueryableOrderBy(IQueryable source, string[] statements) { var expression = source.Expression; var parameter = Expression.Parameter(source.ElementType, String.Empty); for (int idx = 0; idx < statements.Length; idx++) { bool isAscending = true; // Try LINQ ascending/descending suffix string memberReference = ParseStatement(statements[idx], out isAscending); bool isFirstOrderBy = (idx == 0); var methodName = (isFirstOrderBy ? "OrderBy" : "ThenBy") + (isAscending ? String.Empty : "Descending"); // Unravel nested property accesses var memberElements = memberReference.Split('.'); Expression memberExpression = parameter; foreach (string memberElement in memberElements) { if (string.IsNullOrEmpty(memberElement)) { throw new ArgumentException(Strings.EntityDataSourceView_EmptyPropertyName); } memberExpression = Expression.Property(memberExpression, memberElement.Trim()); } expression = Expression.Call(typeof(Queryable), methodName, new Type[] { source.ElementType, memberExpression.Type }, new Expression[] { expression, Expression.Quote(DynamicExpression.Lambda(memberExpression, parameter)) }); } return source.Provider.CreateQuery(expression); } internal IQueryable BuildQueryableOrderBy (IQueryable source) { IQueryable query = source; // Process control's sort arguments if there are any if (_argsSortExpression != null & _argsSortExpression.Trim().Length > 0) { string[] statements = _argsSortExpression.Split(','); if (statements.Length > 0) { query = ExpandQueryableOrderBy(query, statements); } } return query as IQueryable ; } private static string GenerateDefaultOrderByFromTypeUsage(TypeUsage tu) { StringBuilder orderByBuilder = new StringBuilder(); ReadOnlyMetadataCollection propertyCollection; List keyMemberNames = null; EntityType entityType = tu.EdmType as EntityType; if (null != entityType) { ReadOnlyMetadataCollection keyMembers; keyMembers = entityType.KeyMembers; keyMemberNames = new List (entityType.KeyMembers.Count); propertyCollection = entityType.Properties; foreach (EdmMember edmMember in keyMembers) { keyMemberNames.Add(edmMember.Name); } } else { return String.Empty; } foreach (EdmProperty property in propertyCollection) { if (keyMemberNames.Contains(property.Name) && property.TypeUsage.EdmType.BuiltInTypeKind == BuiltInTypeKind.PrimitiveType) { if (0 < orderByBuilder.Length) { orderByBuilder.Append(", "); } orderByBuilder.Append(EntityDataSourceUtil.EntitySqlElementAlias); orderByBuilder.Append("."); orderByBuilder.Append(EntityDataSourceUtil.QuoteEntitySqlIdentifier(property.Name)); } } return orderByBuilder.ToString(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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