Query Nodes

The package org.apache.lucene.queryParser.nodes contains all the basic query nodes. The interface that represents a query node is {@link org.apache.lucene.queryParser.core.nodes.QueryNode}. Every query node must be serializable.

{@link org.apache.lucene.queryParser.core.nodes.QueryNode}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 {@link org.apache.lucene.queryParser.standard.parser.StandardSyntaxParser}, it implements Lucene's standard syntax.

{@link org.apache.lucene.queryParser.core.nodes.QueryNode} interface should be implemented by all query nodes, the class {@link org.apache.lucene.queryParser.core.nodes.QueryNodeImpl} implements {@link org.apache.lucene.queryParser.core.nodes.QueryNode} and is extended by all current query node implementations.

A query node tree can be printed to the a stream, and it generates a pseudo XML representation with all the nodes.

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.

Grouping nodes:

• 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
• ParametricRangeQueryNode - 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

Leaf Nodes:

• FieldQueryNode - field/value node
• NumericQueryNode - used for numeric search
• PathQueryNode - {@link org.apache.lucene.queryParser.core.nodes.QueryNode} object used with path-like queries
• OpaqueQueryNode - Used as for part of the query that can be parsed by other parsers. schema/value
• ParametricQueryNode - used for parametric field [>=|<=|=|<|>] value
• PrefixWildcardQueryNode - non-phrase wildcard query
• QuotedFieldQUeryNode - regular phrase node
• WildcardQueryNode - non-phrase wildcard query

Utility Nodes:

• DeletedQueryNode - used by processors on optimizations
• MatchAllDocsQueryNode - used by processors on optimizations
• MatchNoDocsQueryNode - used by processors on optimizations
• NoTokenFoundQueryNode - used by tokenizers/lemmatizers/analyzers