Package org.apache.lucene.queryparser.flexible.core
Flexible Query Parser
This package contains the necessary classes to implement a query parser.
A query parser is divided in at least 2 phases, text parsing and query building, and one optional phase called query processing.
First Phase: Text Parsing
The text parsing phase is performed by a text parser, which implements SyntaxParser interface. A text parser is
responsible to get a query string and convert it to a QueryNode tree, which is an object structure
that represents the elements defined in the query string.
Second (optional) Phase: Query Processing
The query processing phase is performed by a query processor, which implements QueryNodeProcessor. A query processor is
responsible to perform any processing on a QueryNode tree. This phase is optional and is
used only if an extra processing, validation, query expansion, etc needs to be performed in a
QueryNode tree. The QueryNode tree can be either be generated by a
text parser or programmatically created.
Third Phase: Query Building
The query building phase is performed by a query builder, which implements QueryBuilder. A query builder is
responsible to convert a QueryNode tree
into an arbitrary object, which is usually used to be executed against a search index.
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Class Summary Class Description QueryParserHelper 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. -
Exception Summary Exception Description QueryNodeException This exception should be thrown if something wrong happens when dealing withQueryNodes.QueryNodeParseException This should be thrown when an exception happens during the query parsing from string to the query node tree. -
Error Summary Error Description QueryNodeError Error class with NLS support