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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
#if !NO_EXPRESSIONS
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
namespace System.Reactive.Linq
{
/// <summary>
/// Provides a set of static methods for writing queries over observable sequences, allowing translation to a target query language.
/// </summary>
[LocalQueryMethodImplementationType(typeof(ObservableEx))]
public static partial class QbservableEx
{
internal static Expression GetSourceExpression<TSource>(IObservable<TSource> source)
{
var q = source as IQbservable<TSource>;
if (q != null)
return q.Expression;
return Expression.Constant(source, typeof(IObservable<TSource>));
}
internal static Expression GetSourceExpression<TSource>(IEnumerable<TSource> source)
{
var q = source as IQueryable<TSource>;
if (q != null)
return q.Expression;
return Expression.Constant(source, typeof(IEnumerable<TSource>));
}
internal static Expression GetSourceExpression<TSource>(IObservable<TSource>[] sources)
{
return Expression.NewArrayInit(
typeof(IObservable<TSource>),
sources.Select(source => GetSourceExpression(source))
);
}
internal static Expression GetSourceExpression<TSource>(IEnumerable<TSource>[] sources)
{
return Expression.NewArrayInit(
typeof(IEnumerable<TSource>),
sources.Select(source => GetSourceExpression(source))
);
}
internal static MethodInfo InfoOf<R>(Expression<Func<R>> f)
{
return ((MethodCallExpression)f.Body).Method;
}
}
}
#endif
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