org.apache.lucene.queryParser.precedence
public class PrecedenceQueryParser extends Object implements PrecedenceQueryParserConstants
+
) or a minus (-
) sign, indicating
that the clause is required or prohibited respectively; or
+
/-
prefix to require any of a set of
terms.
Query ::= ( Clause )* Clause ::= ["+", "-"] [<TERM> ":"] ( <TERM> | "(" Query ")" )
Examples of appropriately formatted queries can be found in the query syntax documentation.
Field Summary | |
---|---|
static PrecedenceQueryParser.Operator | AND_OPERATOR |
Token | jj_nt |
boolean | lookingAhead |
static PrecedenceQueryParser.Operator | OR_OPERATOR |
Token | token |
PrecedenceQueryParserTokenManager | token_source |
Constructor Summary | |
---|---|
PrecedenceQueryParser(String f, Analyzer a) Constructs a query parser. | |
PrecedenceQueryParser(CharStream stream) | |
PrecedenceQueryParser(PrecedenceQueryParserTokenManager tm) |
Method Summary | |
---|---|
protected void | addClause(Vector clauses, int conj, int modifier, Query q) |
Query | andExpression(String field) |
Query | Clause(String field) |
int | Conjunction() |
void | disable_tracing() |
void | enable_tracing() |
static String | escape(String s)
Returns a String where those characters that QueryParser
expects to be escaped are escaped by a preceding \ . |
ParseException | generateParseException() |
Analyzer | getAnalyzer() |
protected Query | getBooleanQuery(Vector clauses)
Factory method for generating query, given a set of clauses.
|
protected Query | getBooleanQuery(Vector clauses, boolean disableCoord)
Factory method for generating query, given a set of clauses.
|
PrecedenceQueryParser.Operator | getDefaultOperator()
Gets implicit operator setting, which will be either AND_OPERATOR
or OR_OPERATOR. |
String | getField() |
protected Query | getFieldQuery(String field, String queryText) |
protected Query | getFieldQuery(String field, String queryText, int slop)
Base implementation delegates to getFieldQuery.
|
float | getFuzzyMinSim()
Get the minimal similarity for fuzzy queries. |
int | getFuzzyPrefixLength()
Get the prefix length for fuzzy queries. |
protected Query | getFuzzyQuery(String field, String termStr, float minSimilarity)
Factory method for generating a query (similar to
PrecedenceQueryParser). |
Locale | getLocale()
Returns current locale, allowing access by subclasses. |
boolean | getLowercaseExpandedTerms() |
Token | getNextToken() |
int | getPhraseSlop()
Gets the default slop for phrases. |
protected Query | getPrefixQuery(String field, String termStr)
Factory method for generating a query (similar to
PrecedenceQueryParser). |
protected Query | getRangeQuery(String field, String part1, String part2, boolean inclusive) |
Token | getToken(int index) |
protected Query | getWildcardQuery(String field, String termStr)
Factory method for generating a query. |
static void | main(String[] args)
Command line tool to test QueryParser, using SimpleAnalyzer.
|
int | Modifier() |
Query | parse(String expression) Parses a query string, returning a Query. |
Query | Query(String field) |
void | ReInit(CharStream stream) |
void | ReInit(PrecedenceQueryParserTokenManager tm) |
void | setDefaultOperator(PrecedenceQueryParser.Operator op)
Sets the boolean operator of the QueryParser.
|
void | setFuzzyMinSim(float fuzzyMinSim)
Set the minimum similarity for fuzzy queries.
|
void | setFuzzyPrefixLength(int fuzzyPrefixLength)
Set the prefix length for fuzzy queries. |
void | setLocale(Locale locale)
Set locale used by date range parsing. |
void | setLowercaseExpandedTerms(boolean lowercaseExpandedTerms)
Whether terms of wildcard, prefix, fuzzy and range queries are to be automatically
lower-cased or not. |
void | setPhraseSlop(int phraseSlop)
Sets the default slop for phrases. |
Query | Term(String field) |
Parameters: f the default field for query terms. a used to find terms in the query text.
\
.Returns: Returns the analyzer.
Parameters: clauses Vector that contains BooleanClause instances to join.
Returns: Resulting Query object.
Throws: ParseException throw in overridden method to disallow
Parameters: clauses Vector that contains BooleanClause instances to join. disableCoord true if coord scoring should be disabled.
Returns: Resulting Query object.
Throws: ParseException throw in overridden method to disallow
Returns: Returns the field.
Throws: ParseException throw in overridden method to disallow
Throws: ParseException throw in overridden method to disallow
Returns: Returns the fuzzyPrefixLength.
Parameters: field Name of the field query will use. termStr Term token to use for building term for the query
Returns: Resulting Query built for the term
Throws: ParseException throw in overridden method to disallow
See Also: PrecedenceQueryParser
Depending on settings, a prefix term may be lower-cased automatically. It will not go through the default Analyzer, however, since normal Analyzers are unlikely to work properly with wildcard templates.
Can be overridden by extending classes, to provide custom handling for wild card queries, which may be necessary due to missing analyzer calls.
Parameters: field Name of the field query will use. termStr Term token to use for building term for the query (without trailing '*' character!)
Returns: Resulting Query built for the term
Throws: ParseException throw in overridden method to disallow
Throws: ParseException throw in overridden method to disallow
Depending on settings, prefix term may be lower-cased automatically. It will not go through the default Analyzer, however, since normal Analyzers are unlikely to work properly with wildcard templates.
Can be overridden by extending classes, to provide custom handling for wildcard queries, which may be necessary due to missing analyzer calls.
Parameters: field Name of the field query will use. termStr Term token that contains one or more wild card characters (? or *), but is not simple prefix term
Returns: Resulting Query built for the term
Throws: ParseException throw in overridden method to disallow
java org.apache.lucene.queryParser.QueryParser <input>
Parameters: expression the query string to be parsed.
Throws: ParseException if the parsing fails
OR_OPERATOR
) terms without any modifiers
are considered optional: for example capital of Hungary
is equal to
capital OR of OR Hungary
.AND_OPERATOR
mode terms are considered to be in conjuction: the
above mentioned query is parsed as capital AND of AND Hungary
Parameters: fuzzyPrefixLength The fuzzyPrefixLength to set.
true
.