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NoChildOptimizationQueryNodeProcessor.cs
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NoChildOptimizationQueryNodeProcessor.cs
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using Lucene.Net.QueryParsers.Flexible.Core.Nodes;
using System.Collections.Generic;
namespace Lucene.Net.QueryParsers.Flexible.Core.Processors
{
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/// <summary>
/// A <see cref="NoChildOptimizationQueryNodeProcessor"/> removes every
/// BooleanQueryNode, BoostQueryNode, TokenizedPhraseQueryNode or
/// ModifierQueryNode that do not have a valid children.
/// <para>
/// Example: When the children of these nodes are removed for any reason then the
/// nodes may become invalid.
/// </para>
/// </summary>
public class NoChildOptimizationQueryNodeProcessor : QueryNodeProcessor
{
public NoChildOptimizationQueryNodeProcessor()
{
// empty constructor
}
protected override IQueryNode PostProcessNode(IQueryNode node)
{
if (node is BooleanQueryNode || node is BoostQueryNode
|| node is TokenizedPhraseQueryNode
|| node is ModifierQueryNode)
{
IList<IQueryNode> children = node.GetChildren();
if (children != null && children.Count > 0)
{
foreach (IQueryNode child in children)
{
if (!(child is DeletedQueryNode))
{
return node;
}
}
}
return new MatchNoDocsQueryNode();
}
return node;
}
protected override IQueryNode PreProcessNode(IQueryNode node)
{
return node;
}
protected override IList<IQueryNode> SetChildrenOrder(IList<IQueryNode> children)
{
return children;
}
}
}