133 lines
3.6 KiB
C#
133 lines
3.6 KiB
C#
//
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// QueryableEnumerable<TElement>.cs
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//
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// Authors:
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// Roei Erez (roeie@mainsoft.com)
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// Jb Evain (jbevain@novell.com)
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//
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// Copyright (C) 2008 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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namespace System.Linq {
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interface IQueryableEnumerable : IQueryable {
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IEnumerable GetEnumerable ();
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}
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interface IQueryableEnumerable<TElement> : IQueryableEnumerable, IQueryable<TElement>, IOrderedQueryable<TElement> {
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}
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class QueryableEnumerable<TElement> : IQueryableEnumerable<TElement>, IQueryProvider {
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Expression expression;
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IEnumerable<TElement> enumerable;
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public Type ElementType {
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get { return typeof (TElement); }
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}
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public Expression Expression {
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get { return expression; }
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}
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public IQueryProvider Provider {
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get { return this; }
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}
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public QueryableEnumerable (IEnumerable<TElement> enumerable)
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{
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this.expression = Expression.Constant (this);
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this.enumerable = enumerable;
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}
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public QueryableEnumerable (Expression expression)
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{
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this.expression = expression;
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}
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public IEnumerable GetEnumerable ()
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{
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return enumerable;
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}
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IEnumerator IEnumerable.GetEnumerator ()
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{
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return GetEnumerator ();
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}
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public IEnumerator<TElement> GetEnumerator ()
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{
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return Execute<IEnumerable<TElement>> (expression).GetEnumerator ();
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}
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public IQueryable CreateQuery (Expression expression)
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{
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return (IQueryable) Activator.CreateInstance (
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typeof (QueryableEnumerable<>).MakeGenericType (
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expression.Type.GetFirstGenericArgument ()), expression);
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}
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public object Execute (Expression expression)
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{
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var lambda = Expression.Lambda (TransformQueryable (expression));
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return lambda.Compile ().DynamicInvoke ();
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}
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static Expression TransformQueryable (Expression expression)
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{
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return new QueryableTransformer ().Transform (expression);
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}
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public IQueryable<TElem> CreateQuery<TElem> (Expression expression)
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{
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return new QueryableEnumerable<TElem> (expression);
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}
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public TResult Execute<TResult> (Expression expression)
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{
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var lambda = Expression.Lambda<Func<TResult>> (TransformQueryable (expression));
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return lambda.Compile ().Invoke ();
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}
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public override string ToString ()
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{
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if (enumerable != null)
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return enumerable.ToString ();
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if (expression == null)
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return base.ToString ();
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var constant = expression as ConstantExpression;
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if (constant != null && constant.Value == this)
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return base.ToString ();
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return expression.ToString ();
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}
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}
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}
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