Class RemoveEmptyNonLeafQueryNodeProcessor

This processor removes every IQueryNode that is not a leaf and has not children. If after processing the entire tree the root node is not a leaf and has no children, a MatchNoDocsQueryNode object is returned.

This processor is used at the end of a pipeline to avoid invalid query node tree structures like a GroupQueryNode or ModifierQueryNode with no children.

Inheritance
System.Object
QueryNodeProcessor
RemoveEmptyNonLeafQueryNodeProcessor
Implements
Inherited Members
Namespace: Lucene.Net.QueryParsers.Flexible.Standard.Processors
Assembly: Lucene.Net.QueryParser.dll
Syntax
public class RemoveEmptyNonLeafQueryNodeProcessor : QueryNodeProcessor, IQueryNodeProcessor

Constructors

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RemoveEmptyNonLeafQueryNodeProcessor()

Declaration
public RemoveEmptyNonLeafQueryNodeProcessor()

Methods

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PostProcessNode(IQueryNode)

Declaration
protected override IQueryNode PostProcessNode(IQueryNode node)
Parameters
Type Name Description
IQueryNode node
Returns
Type Description
IQueryNode
Overrides
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PreProcessNode(IQueryNode)

Declaration
protected override IQueryNode PreProcessNode(IQueryNode node)
Parameters
Type Name Description
IQueryNode node
Returns
Type Description
IQueryNode
Overrides
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Process(IQueryNode)

Declaration
public override IQueryNode Process(IQueryNode queryTree)
Parameters
Type Name Description
IQueryNode queryTree
Returns
Type Description
IQueryNode
Overrides
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SetChildrenOrder(IList<IQueryNode>)

Declaration
protected override IList<IQueryNode> SetChildrenOrder(IList<IQueryNode> children)
Parameters
Type Name Description
IList<IQueryNode> children
Returns
Type Description
IList<IQueryNode>
Overrides

Implements

See Also