org.apache.lucene.queryParser.ext
Class ParserExtension
java.lang.Object
org.apache.lucene.queryParser.ext.ParserExtension
public abstract class ParserExtension
- extends Object
This class represents an extension base class to the Lucene standard
QueryParser
. The QueryParser
is 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 the ParserExtension
can be customized and plugged into an
instance of ExtendableQueryParser
, a direct subclass of
QueryParser
.
- See Also:
Extensions
,
ExtendableQueryParser
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
ParserExtension
public ParserExtension()
parse
public abstract Query parse(ExtensionQuery query)
throws ParseException
- Processes the given
ExtensionQuery
and returns a corresponding
Query
instance. Subclasses must either return a Query
instance or raise a ParseException
. This method must not return
null
.
- Parameters:
query
- the extension query
- Returns:
- a new query instance
- Throws:
ParseException
- if the query can not be parsed.
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