Class QueryParserHelper<TQuery>

This class is a helper for the query parser framework, it does all the three query parser phrases at once: text parsing, query processing and query building.

It contains methods that allows the user to change the implementation used on the three phases.

Inheritance
System.Object
QueryParserHelper<TQuery>
StandardQueryParser
Namespace: Lucene.Net.QueryParsers.Flexible.Core
Assembly: Lucene.Net.QueryParser.dll
Syntax
public class QueryParserHelper<TQuery> : object
Type Parameters
Name Description
TQuery

Constructors

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QueryParserHelper(QueryConfigHandler, ISyntaxParser, IQueryNodeProcessor, IQueryBuilder<TQuery>)

Creates a query parser helper object using the specified configuration, text parser, processor and builder.

Declaration
public QueryParserHelper(QueryConfigHandler queryConfigHandler, ISyntaxParser syntaxParser, IQueryNodeProcessor processor, IQueryBuilder<TQuery> builder)
Parameters
Type Name Description
QueryConfigHandler queryConfigHandler

the query configuration handler that will be initially set to this helper
ISyntaxParser syntaxParser

the text parser that will be initially set to this helper
IQueryNodeProcessor processor

the query processor that will be initially set to this helper
IQueryBuilder<TQuery> builder

the query builder that will be initially set to this helper
See Also

Properties

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QueryBuilder

Returns the query builder used to build a object from the query node tree. The object produced by this builder is returned by Parse(String, String).

Declaration
public virtual IQueryBuilder<TQuery> QueryBuilder { get; }
Property Value
Type Description
IQueryBuilder<TQuery>
See Also
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QueryConfigHandler

Returns the query configuration handler, which is used during the query node tree processing. It can be null.

Declaration
public virtual QueryConfigHandler QueryConfigHandler { get; }
Property Value
Type Description
QueryConfigHandler
See Also
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QueryNodeProcessor

Gets the processor object used to process the query node tree, it returns null if no processor is used.

Declaration
public virtual IQueryNodeProcessor QueryNodeProcessor { get; }
Property Value
Type Description
IQueryNodeProcessor
See Also
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SyntaxParser

Returns the text parser used to build a query node tree from a query string. The default text parser instance returned by this method is a ISyntaxParser.

Declaration
public virtual ISyntaxParser SyntaxParser { get; }
Property Value
Type Description
ISyntaxParser
See Also

Methods

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Parse(String, String)

Parses a query string to an object, usually some query object.

In this method the three phases are executed:

  1. the query string is parsed using the text parser returned by SyntaxParser, the result is a query node tree.
  2. the query node tree is processed by the processor returned by QueryNodeProcessor.
  3. a object is built from the query node tree using the builder returned by QueryBuilder.

Declaration
public virtual TQuery Parse(string query, string defaultField)
Parameters
Type Name Description
System.String query

the query string
System.String defaultField

the default field used by the text parser
Returns
Type Description
TQuery

the object built from the query
Exceptions
Type Condition
QueryNodeException

if something wrong happens along the three phases
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SetQueryBuilder(IQueryBuilder<TQuery>)

The query builder that will be used to build an object from the query node tree. It cannot be null.

Declaration
public virtual void SetQueryBuilder(IQueryBuilder<TQuery> queryBuilder)
Parameters
Type Name Description
IQueryBuilder<TQuery> queryBuilder

the query builder used to build something from the query node tree
See Also
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SetQueryConfigHandler(QueryConfigHandler)

Sets the query configuration handler that will be used during query processing. It can be null. It's also set to the processor returned by QueryNodeProcessor.

Declaration
public virtual void SetQueryConfigHandler(QueryConfigHandler config)
Parameters
Type Name Description
QueryConfigHandler config

the query configuration handler used during query processing, it can be null
See Also
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SetQueryNodeProcessor(IQueryNodeProcessor)

Sets the processor that will be used to process the query node tree. If there is any QueryConfigHandler returned by QueryConfigHandler, it will be set on the processor. The argument can be null, which means that no processor will be used to process the query node tree.

Declaration
public virtual void SetQueryNodeProcessor(IQueryNodeProcessor processor)
Parameters
Type Name Description
IQueryNodeProcessor processor

the processor that will be used to process the query node tree, this argument can be null
See Also
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SetSyntaxParser(ISyntaxParser)

Sets the text parser that will be used to parse the query string, it cannot be null.

Declaration
public virtual void SetSyntaxParser(ISyntaxParser syntaxParser)
Parameters
Type Name Description
ISyntaxParser syntaxParser

the text parser that will be used to parse the query string
See Also

See Also