2 // QueryableEnumerable<TElement>.cs
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5 // Roei Erez (roeie@mainsoft.com)
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7 // Copyright (C) 2007 Novell, Inc (http://www.novell.com)
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9 // Permission is hereby granted, free of charge, to any person obtaining
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10 // a copy of this software and associated documentation files (the
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11 // "Software"), to deal in the Software without restriction, including
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12 // without limitation the rights to use, copy, modify, merge, publish,
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13 // distribute, sublicense, and/or sell copies of the Software, and to
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14 // permit persons to whom the Software is furnished to do so, subject to
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15 // the following conditions:
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17 // The above copyright notice and this permission notice shall be
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18 // included in all copies or substantial portions of the Software.
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20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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30 using System.Collections.Generic;
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33 using System.Linq.Expressions;
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35 namespace System.Linq
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37 internal class QueryableEnumerable<TElement> : IQueryable<TElement>, IQueryProvider, IOrderedQueryable<TElement>
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39 Expression expression;
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41 public QueryableEnumerable (Expression expression) {
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42 this.expression = expression;
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45 public Type ElementType {
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46 get { return expression.Type; }
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49 public Expression Expression {
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50 get { return expression; }
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53 public IQueryProvider Provider {
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54 get { return this; }
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57 public System.Collections.IEnumerator GetEnumerator ()
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59 return ((IEnumerable<TElement>)this).GetEnumerator ();
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62 IEnumerator<TElement> IEnumerable<TElement>.GetEnumerator ()
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64 return Execute<IEnumerable<TElement>> (Expression).GetEnumerator ();
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67 public IQueryable CreateQuery (System.Linq.Expressions.Expression expression)
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69 return (IQueryable) Activator.CreateInstance (
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70 typeof (QueryableEnumerable<>).MakeGenericType (expression.Type.GetGenericArguments()[0]), expression);
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73 public object Execute (System.Linq.Expressions.Expression expression)
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75 QueryableTransformer visitor = new QueryableTransformer ();
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76 Expression body = visitor.Transform (expression);
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77 LambdaExpression lambda = Expression.Lambda (body);
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78 return lambda.Compile ().DynamicInvoke();
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81 public IQueryable<TElem> CreateQuery<TElem> (System.Linq.Expressions.Expression expression)
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83 return new QueryableEnumerable<TElem> (expression);
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86 public TResult Execute<TResult> (System.Linq.Expressions.Expression expression)
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88 QueryableTransformer visitor = new QueryableTransformer ();
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89 Expression body = visitor.Transform (expression);
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90 Expression<Func<TResult>> lambda = Expression.Lambda<Func<TResult>> (body);
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91 return lambda.Compile () ();
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