2 // QueryableEnumerable<TElement>.cs
5 // Roei Erez (roeie@mainsoft.com)
6 // Jb Evain (jbevain@novell.com)
8 // Copyright (C) 2008 Novell, Inc (http://www.novell.com)
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 using System.Collections;
32 using System.Collections.Generic;
34 using System.Linq.Expressions;
36 namespace System.Linq {
38 interface IQueryableEnumerable : IQueryable {
39 IEnumerable GetEnumerable ();
42 interface IQueryableEnumerable<TElement> : IQueryableEnumerable, IQueryable<TElement>, IOrderedQueryable<TElement> {
45 class QueryableEnumerable<TElement> : IQueryableEnumerable<TElement>, IQueryProvider {
47 Expression expression;
48 IEnumerable<TElement> enumerable;
50 public Type ElementType {
51 get { return typeof (TElement); }
54 public Expression Expression {
55 get { return expression; }
58 public IQueryProvider Provider {
62 public QueryableEnumerable (IEnumerable<TElement> enumerable)
64 this.expression = Expression.Constant (this);
65 this.enumerable = enumerable;
68 public QueryableEnumerable (Expression expression)
70 this.expression = expression;
73 public IEnumerable GetEnumerable ()
78 IEnumerator IEnumerable.GetEnumerator ()
80 return GetEnumerator ();
83 public IEnumerator<TElement> GetEnumerator ()
85 return Execute<IEnumerable<TElement>> (expression).GetEnumerator ();
88 public IQueryable CreateQuery (Expression expression)
90 return (IQueryable) Activator.CreateInstance (
91 typeof (QueryableEnumerable<>).MakeGenericType (
92 expression.Type.GetFirstGenericArgument ()), expression);
95 public object Execute (Expression expression)
97 var lambda = Expression.Lambda (TransformQueryable (expression));
98 return lambda.Compile ().DynamicInvoke ();
101 static Expression TransformQueryable (Expression expression)
103 return new QueryableTransformer ().Transform (expression);
106 public IQueryable<TElem> CreateQuery<TElem> (Expression expression)
108 return new QueryableEnumerable<TElem> (expression);
111 public TResult Execute<TResult> (Expression expression)
113 var lambda = Expression.Lambda<Func<TResult>> (TransformQueryable (expression));
114 return lambda.Compile ().Invoke ();