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namespace System.Web.UI.WebControls {
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.Resources;
using System.Web.UI;
using System.Web.UI.WebControls;
internal static class QueryableDataSourceHelper {
// This regular expression verifies that parameter names are set to valid identifiers. This validation
// needs to match the parser's identifier validation as done in the default block of NextToken().
private static readonly string IdentifierPattern =
@"^\s*[\p{Lu}\p{Ll}\p{Lt}\p{Lm}\p{Lo}\p{Nl}_]" + // first character
@"[\p{Lu}\p{Ll}\p{Lt}\p{Lm}\p{Lo}\p{Nl}\p{Nd}\p{Pc}\p{Mn}\p{Mc}\p{Cf}_]*"; // remaining characters
private static readonly Regex IdentifierRegex = new Regex(IdentifierPattern + @"\s*$");
private static readonly Regex AutoGenerateOrderByRegex = new Regex(IdentifierPattern +
@"(\s+(asc|ascending|desc|descending))?\s*$", RegexOptions.IgnoreCase); // order operators
internal static IQueryable AsQueryable(object o) {
IQueryable oQueryable = o as IQueryable;
if (oQueryable != null) {
return oQueryable;
}
// Wrap strings in IEnumerable<string> instead of treating as IEnumerable<char>.
string oString = o as string;
if (oString != null) {
return Queryable.AsQueryable(new string[] { oString });
}
IEnumerable oEnumerable = o as IEnumerable;
if (oEnumerable != null) {
// IEnumerable<T> can be directly converted to an IQueryable<T>.
Type genericType = FindGenericEnumerableType(o.GetType());
if (genericType != null) {
// The non-generic Queryable.AsQueryable gets called for array types, executing
// the FindGenericType logic again. Might want to investigate way to avoid this.
return Queryable.AsQueryable(oEnumerable);
}
// Wrap non-generic IEnumerables in IEnumerable<object>.
List<object> genericList = new List<object>();
foreach (object item in oEnumerable) {
genericList.Add(item);
}
return Queryable.AsQueryable(genericList);
}
// Wrap non-IEnumerable types in IEnumerable<T>.
Type listType = typeof(List<>).MakeGenericType(o.GetType());
IList list = (IList)DataSourceHelper.CreateObjectInstance(listType);
list.Add(o);
return Queryable.AsQueryable(list);
}
public static IList ToList(this IQueryable query, Type dataObjectType) {
MethodInfo toListMethod = typeof(Enumerable).GetMethod("ToList").MakeGenericMethod(dataObjectType);
return (IList)toListMethod.Invoke(null, new object[] { query });
}
public static bool EnumerableContentEquals(IEnumerable enumerableA, IEnumerable enumerableB) {
IEnumerator enumeratorA = enumerableA.GetEnumerator();
IEnumerator enumeratorB = enumerableB.GetEnumerator();
while (enumeratorA.MoveNext()) {
if (!enumeratorB.MoveNext())
return false;
object itemA = enumeratorA.Current;
object itemB = enumeratorB.Current;
if (itemA == null) {
if (itemB != null)
return false;
}
else if (!itemA.Equals(itemB))
return false;
}
if (enumeratorB.MoveNext())
return false;
return true;
}
public static Type FindGenericEnumerableType(Type type) {
// Logic taken from Queryable.AsQueryable which accounts for Array types which are not
// generic but implement the generic IEnumerable interface.
while ((type != null) && (type != typeof(object)) && (type != typeof(string))) {
if (type.IsGenericType && (type.GetGenericTypeDefinition() == typeof(IEnumerable<>))) {
return type;
}
foreach (Type interfaceType in type.GetInterfaces()) {
Type genericInterface = FindGenericEnumerableType(interfaceType);
if (genericInterface != null) {
return genericInterface;
}
}
type = type.BaseType;
}
return null;
}
internal static IDictionary<string, object> ToEscapedParameterKeys(this ParameterCollection parameters, HttpContext context, Control control) {
if (parameters != null) {
return parameters.GetValues(context, control).ToEscapedParameterKeys(control);
}
return null;
}
internal static IDictionary<string, object> ToEscapedParameterKeys(this IDictionary parameters, Control owner) {
Dictionary<string, object> escapedParameters = new Dictionary<string, object>(parameters.Count,
StringComparer.OrdinalIgnoreCase);
foreach (DictionaryEntry de in parameters) {
string key = (string)de.Key;
if (String.IsNullOrEmpty(key)) {
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
AtlasWeb.LinqDataSourceView_ParametersMustBeNamed, owner.ID));
}
ValidateParameterName(key, owner);
escapedParameters.Add('@' + key, de.Value);
}
return escapedParameters;
}
internal static IDictionary<string, object> ToEscapedParameterKeys(this IDictionary<string, object> parameters, Control owner) {
Dictionary<string, object> escapedParameters = new Dictionary<string, object>(parameters.Count,
StringComparer.OrdinalIgnoreCase);
foreach (KeyValuePair<string, object> parameter in parameters) {
string key = parameter.Key;
if (String.IsNullOrEmpty(key)) {
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
AtlasWeb.LinqDataSourceView_ParametersMustBeNamed, owner.ID));
}
ValidateParameterName(key, owner);
escapedParameters.Add('@' + key, parameter.Value);
}
return escapedParameters;
}
internal static IQueryable CreateOrderByExpression(IOrderedDictionary parameters, IQueryable source, IDynamicQueryable queryable) {
if (parameters != null && parameters.Count > 0) {
//extract parameter values
//extract the order by expression and apply it to the queryable
string orderByExpression = GetOrderByClause(parameters.ToDictionary());
if (!String.IsNullOrEmpty(orderByExpression)) {
return queryable.OrderBy(source, orderByExpression);
}
}
return source;
}
internal static IQueryable CreateWhereExpression(IDictionary<string, object> parameters, IQueryable source, IDynamicQueryable queryable) {
if (parameters != null && parameters.Count > 0) {
//extract the where clause
WhereClause clause = GetWhereClause(parameters);
if (!String.IsNullOrEmpty(clause.Expression)) {
//transform the current query with the where clause
return queryable.Where(source, clause.Expression, clause.Parameters);
}
}
return source;
}
private static WhereClause GetWhereClause(IDictionary<string, object> whereParameters) {
Debug.Assert((whereParameters != null) && (whereParameters.Count > 0));
WhereClause whereClause = new WhereClause();
whereClause.Parameters = new Dictionary<string, object>(whereParameters.Count);
StringBuilder where = new StringBuilder();
int index = 0;
foreach (KeyValuePair<string, object> parameter in whereParameters) {
string key = parameter.Key;
string value = (parameter.Value == null) ? null : parameter.Value.ToString();
// exclude null and empty values.
if (!(String.IsNullOrEmpty(key) || String.IsNullOrEmpty(value))) {
string newKey = "@p" + index++;
if (where.Length > 0) {
where.Append(" AND ");
}
where.Append(key);
where.Append(" == ");
where.Append(newKey);
whereClause.Parameters.Add(newKey, parameter.Value);
}
}
whereClause.Expression = where.ToString();
return whereClause;
}
private static string GetOrderByClause(IDictionary<string, object> orderByParameters) {
Debug.Assert((orderByParameters != null) && (orderByParameters.Count > 0));
StringBuilder orderBy = new StringBuilder();
foreach (KeyValuePair<string, object> parameter in orderByParameters) {
string value = (string)parameter.Value;
// exclude null and empty values.
if (!String.IsNullOrEmpty(value)) {
string name = parameter.Key;
//validate parameter name
ValidateOrderByParameter(name, value);
if (orderBy.Length > 0) {
orderBy.Append(", ");
}
orderBy.Append(value);
}
}
return orderBy.ToString();
}
internal static void ValidateOrderByParameter(string name, string value) {
if (!AutoGenerateOrderByRegex.IsMatch(value)) {
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
AtlasWeb.LinqDataSourceView_InvalidOrderByFieldName, value, name));
}
}
internal static void ValidateParameterName(string name, Control owner) {
if (!IdentifierRegex.IsMatch(name)) {
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
AtlasWeb.LinqDataSourceView_InvalidParameterName, name, owner.ID));
}
}
private class WhereClause {
public string Expression { get; set; }
public IDictionary<string, object> Parameters { get; set; }
}
}
}
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