Class ParserExtension
- java.lang.Object
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- org.apache.lucene.queryparser.ext.ParserExtension
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public abstract class ParserExtension extends Object
This class represents an extension base class to the Lucene standardQueryParser. TheQueryParseris generated by the JavaCC parser generator. Changing or adding functionality or syntax in the standard query parser requires changes to the JavaCC source file. To enable extending the standard query parser without changing the JavaCC sources and re-generate the parser theParserExtensioncan be customized and plugged into an instance ofExtendableQueryParser, a direct subclass ofQueryParser.- See Also:
Extensions,ExtendableQueryParser
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Constructor Summary
Constructors Constructor Description ParserExtension()
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description abstract Queryparse(ExtensionQuery query)Processes the givenExtensionQueryand returns a correspondingQueryinstance.
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Method Detail
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parse
public abstract Query parse(ExtensionQuery query) throws ParseException
Processes the givenExtensionQueryand returns a correspondingQueryinstance. Subclasses must either return aQueryinstance or raise aParseException. This method must not returnnull.- Parameters:
query- the extension query- Returns:
- a new query instance
- Throws:
ParseException- if the query can not be parsed.
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