#if NET_4_0
//
// QueryStartNode.cs
//
// Author:
// Jrmie "Garuma" Laval <jeremie.laval@gmail.com>
//
// Copyright (c) 2010 Jrmie "Garuma" Laval
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Concurrent;
using System.Threading;
using System.Threading.Tasks;
namespace System.Linq{
internal class QueryStartNode<T> : QueryBaseNode<T>
{
readonly IEnumerable<T> source;
readonly Partitioner<T> customPartitioner;
internal QueryStartNode (IEnumerable<T> source)
{
if (source == null)
throw new ArgumentNullException ("source");
this.source = source;
}
internal QueryStartNode (Partitioner<T> custom)
{
if (custom == null)
throw new ArgumentNullException ("custom");
this.customPartitioner = custom;
}
public override void Visit (INodeVisitor visitor)
{
visitor.Visit<T> (this);
}
internal override IEnumerable<T> GetSequential ()
{
if (source != null)
return source;
return WrapHelper.Wrap (customPartitioner.GetPartitions (1))[0];
}
internal override IList<IEnumerable<T>> GetEnumerables (QueryOptions options)
{
if (customPartitioner != null) {
return WrapHelper.Wrap (customPartitioner.GetPartitions (options.PartitionCount));
}
Partitioner<T> partitioner
= (options.UseStrip) ? ParallelPartitioner.CreateForStrips (source, 1) : ParallelPartitioner.CreateBest (source);
return WrapHelper.Wrap (partitioner.GetPartitions (options.PartitionCount));
}
internal override IList<IEnumerable<KeyValuePair<long, T>>> GetOrderedEnumerables (QueryOptions options)
{
OrderablePartitioner<T> partitioner = null;
if (customPartitioner != null) {
partitioner = customPartitioner as OrderablePartitioner<T>;
if (partitioner == null)
throw new InvalidOperationException ("The partitionner you are using doesn't support ordered partitionning");
} else {
partitioner =
(options.UseStrip) ? ParallelPartitioner.CreateForStrips (source, 1) : ParallelPartitioner.CreateBest (source);
}
options.PartitionerSettings = Tuple.Create (partitioner.KeysOrderedAcrossPartitions,
partitioner.KeysOrderedInEachPartition,
partitioner.KeysNormalized);
// We only support one style of partitioning at the moment.
// Standard partitioners follow this style.
if (options.UseStrip && (!partitioner.KeysOrderedInEachPartition || partitioner.KeysOrderedAcrossPartitions))
throw new NotImplementedException ("Partitioner must have KeysOrderedInEachPartition "
+ "and !KeysOrderedAcrossPartitions"
+ "to be used with indexed operators");
return WrapHelper.Wrap (partitioner.GetOrderablePartitions (options.PartitionCount));
}
}
}
#endif
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