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| uid: Lucene.Net.QueryParsers.Flexible.Core.Nodes |
| summary: *content |
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| Query nodes commonly used by query parser implementations. |
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| ## Query Nodes |
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| The namespace <tt>Lucene.Net.QueryParsers.Flexible.Core.Nodes</tt> contains all the basic query nodes. The interface that represents a query node is <xref:Lucene.Net.QueryParsers.Flexible.Core.Nodes.IQueryNode>. |
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| <xref:Lucene.Net.QueryParsers.Flexible.Core.Nodes.IQueryNode>s are used by the text parser to create a syntax tree. These nodes are designed to be used by UI or other text parsers. The default Lucene text parser is <xref:Lucene.Net.QueryParsers.Flexible.Standard.Parser.StandardSyntaxParser>, it implements Lucene's standard syntax. |
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| <xref:Lucene.Net.QueryParsers.Flexible.Core.Nodes.IQueryNode> interface should be implemented by all query nodes, the class <xref:Lucene.Net.QueryParsers.Flexible.Core.Nodes.QueryNode> implements <xref:Lucene.Net.QueryParsers.Flexible.Core.Nodes.IQueryNode> and is extended by all current query node implementations. |
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| A query node tree can be printed to the a stream, and it generates a pseudo XML representation with all the nodes. |
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| A query node tree can also generate a query string that can be parsed back by the original text parser, at this point only the standard lucene syntax is supported. |
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| Grouping nodes: |
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| * AndQueryNode - used for AND operator |
| * AnyQueryNode - used for ANY operator |
| * OrQueryNode - used for OR operator |
| * BooleanQueryNode - used when no operator is specified |
| * ModifierQueryNode - used for modifier operator |
| * GroupQueryNode - used for parenthesis |
| * BoostQueryNode - used for boost operator |
| * SlopQueryNode - phrase slop |
| * FuzzyQueryNode - fuzzy node |
| * TermRangeQueryNode - used for parametric field:`[low_value TO high_value]` |
| * ProximityQueryNode - used for proximity search |
| * NumericRangeQueryNode - used for numeric range search |
| * TokenizedPhraseQueryNode - used by tokenizers/lemmatizers/analyzers for phrases/autophrases |
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| Leaf Nodes: |
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| * FieldQueryNode - field/value node |
| * NumericQueryNode - used for numeric search |
| * PathQueryNode - <xref:Lucene.Net.QueryParsers.Flexible.Core.Nodes.IQueryNode> object used with path-like queries |
| * OpaqueQueryNode - Used as for part of the query that can be parsed by other parsers. schema/value |
| * PrefixWildcardQueryNode - non-phrase wildcard query |
| * QuotedFieldQUeryNode - regular phrase node |
| * WildcardQueryNode - non-phrase wildcard query |
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| Utility Nodes: |
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| * DeletedQueryNode - used by processors on optimizations |
| * MatchAllDocsQueryNode - used by processors on optimizations |
| * MatchNoDocsQueryNode - used by processors on optimizations |
| * NoTokenFoundQueryNode - used by tokenizers/lemmatizers/analyzers |
