Package org.apache.lucene.queryparser.classic

# Class QueryParser

java.lang.Object
org.apache.lucene.util.QueryBuilder
org.apache.lucene.queryparser.classic.QueryParserBase
org.apache.lucene.queryparser.classic.QueryParser

All Implemented Interfaces:
  `QueryParserConstants`, `CommonQueryParserConfiguration`

Direct Known Subclasses:
  `ComplexPhraseQueryParser`, `ExtendableQueryParser`, `MultiFieldQueryParser`

public class QueryParser extends QueryParserBase implements QueryParserConstants
This class is generated by JavaCC. The most important method is `QueryParserBase.parse(String)`. The syntax for query strings is as follows: A Query is a series of clauses. A clause may be prefixed by:

- a plus (`+`) or a minus (`-`) sign, indicating that the clause is required or prohibited respectively; or
- a term followed by a colon, indicating the field to be searched. This enables one to construct queries which search multiple fields.

A clause may be either:

- a term, indicating all the documents that contain this term; or
- a nested query, enclosed in parentheses. Note that this may be used with a `+`/`-` prefix to require any of a set of terms.

Thus, in BNF, the query grammar is:

       Query  ::= ( Clause )*
       Clause ::= ["+", "-"] [<TERM> ":"] ( <TERM> | "(" Query ")" )

Examples of appropriately formatted queries can be found in the query syntax documentation.

In `TermRangeQuery`s, QueryParser tries to detect date values, e.g. `date:[6/1/2005 TO 6/4/2005]` produces a range query that searches for "date" fields between 2005-06-01 and 2005-06-04. Note that the format of the accepted input depends on `the locale`. A `DateTools.Resolution` has to be set, if you want to use `DateTools` for date conversion.

The date resolution that shall be used for RangeQueries can be set using `QueryParserBase.setDateResolution(DateTools.Resolution)` or `QueryParserBase.setDateResolution(String, DateTools.Resolution)`. The former sets the default date resolution for all fields, whereas the latter can be used to set field specific date resolutions. Field specific date resolutions take, if set, precedence over the default date resolution.

If you don't use `DateTools` in your index, you can create your own query parser that inherits QueryParser and overwrites `QueryParserBase.getRangeQuery(String, String, String, boolean, boolean)` to use a different method for date conversion.

Note that QueryParser is not thread-safe.

NOTE: there is a new QueryParser in contrib, which matches the same syntax as this class, but is more modular, enabling substantial customization to how a query is created.

- ## Nested Class Summary

  Nested Classes
  Modifier and Type
  Class
  Description
  `static enum`
  `QueryParser.Operator`
  The default operator for parsing queries.

  ## Nested classes/interfaces inherited from class org.apache.lucene.util.QueryBuilder

  `QueryBuilder.TermAndBoost`

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final boolean`
  `DEFAULT_SPLIT_ON_WHITESPACE`
  default split on whitespace behavior
  `Token`
  `jj_nt`
  Next token.
  `Token`
  `token`
  Current token.
  `QueryParserTokenManager`
  `token_source`
  Generated Token Manager.

  ### Fields inherited from class org.apache.lucene.queryparser.classic.QueryParserBase

  `AND_OPERATOR, field, OR_OPERATOR`

  ### Fields inherited from class org.apache.lucene.util.QueryBuilder

  `analyzer, autoGenerateMultiTermSynonymsPhraseQuery, enableGraphQueries, enablePositionIncrements`

  ### Fields inherited from interface org.apache.lucene.queryparser.classic.QueryParserConstants

  `_ESCAPED_CHAR, _NUM_CHAR, _QUOTED_CHAR, _TERM_CHAR, _TERM_START_CHAR, _WHITESPACE, AND, BAREOPER, Boost, CARAT, COLON, DEFAULT, EOF, FUZZY_SLOP, LPAREN, MINUS, NOT, NUMBER, OR, PLUS, PREFIXTERM, QUOTED, Range, RANGE_GOOP, RANGE_QUOTED, RANGE_TO, RANGEEX_END, RANGEEX_START, RANGEIN_END, RANGEIN_START, REGEXPTERM, RPAREN, STAR, TERM, tokenImage, WILDTERM`

- ## Constructor Summary

  Constructors
  Modifier
  Constructor
  Description
  ``
  `QueryParser(String f, Analyzer a)`
  Create a query parser.
  `protected`
  `QueryParser(CharStream stream)`
  Constructor with user supplied CharStream.
  `protected`
  `QueryParser(QueryParserTokenManager tm)`
  Constructor with generated Token Manager.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `final Query`
  `Clause(String field)`
  `final int`
  `Conjunction()`
  `final void`
  `disable_tracing()`
  Disable tracing.
  `final void`
  `enable_tracing()`
  Enable tracing.
  `ParseException`
  `generateParseException()`
  Generate ParseException.
  `final Token`
  `getNextToken()`
  Get the next Token.
  `boolean`
  `getSplitOnWhitespace()`
  `final Token`
  `getToken(int index)`
  Get the specific Token.
  `final int`
  `Modifiers()`
  `final Query`
  `MultiTerm(String field, List<BooleanClause> clauses)`
  Returns the first query if splitOnWhitespace=true or otherwise the entire produced query
  `final Query`
  `Query(String field)`
  `void`
  `ReInit(CharStream stream)`
  Reinitialise.
  `void`
  `ReInit(QueryParserTokenManager tm)`
  Reinitialise.
  `void`
  `setAutoGeneratePhraseQueries(boolean value)`
  Set to true if phrase queries will be automatically generated when the analyzer returns more than one term from whitespace delimited text.
  `void`
  `setSplitOnWhitespace(boolean splitOnWhitespace)`
  Whether query text should be split on whitespace prior to analysis.
  `final Query`
  `Term(String field)`
  `final Query`
  `TopLevelQuery(String field)`
  `final boolean`
  `trace_enabled()`
  Trace enabled.

  ### Methods inherited from class org.apache.lucene.queryparser.classic.QueryParserBase

  `addClause, addMultiTermClauses, escape, getAllowLeadingWildcard, getAutoGeneratePhraseQueries, getBooleanQuery, getDateResolution, getDefaultOperator, getDeterminizeWorkLimit, getField, getFieldQuery, getFieldQuery, getFuzzyDistance, getFuzzyMinSim, getFuzzyPrefixLength, getFuzzyQuery, getLocale, getMultiTermRewriteMethod, getPhraseSlop, getPrefixQuery, getRangeQuery, getRegexpQuery, getTimeZone, getWildcardQuery, init, newBooleanClause, newFieldQuery, newFuzzyQuery, newMatchAllDocsQuery, newPrefixQuery, newRangeQuery, newRegexpQuery, newWildcardQuery, parse, setAllowLeadingWildcard, setDateResolution, setDateResolution, setDefaultOperator, setDeterminizeWorkLimit, setFuzzyMinSim, setFuzzyPrefixLength, setLocale, setMultiTermRewriteMethod, setPhraseSlop, setTimeZone`

  ### Methods inherited from class org.apache.lucene.util.QueryBuilder

  `add, analyzeBoolean, analyzeGraphBoolean, analyzeGraphPhrase, analyzeMultiBoolean, analyzeMultiPhrase, analyzePhrase, analyzeTerm, createBooleanQuery, createBooleanQuery, createFieldQuery, createFieldQuery, createMinShouldMatchQuery, createPhraseQuery, createPhraseQuery, getAnalyzer, getAutoGenerateMultiTermSynonymsPhraseQuery, getEnableGraphQueries, getEnablePositionIncrements, newBooleanQuery, newGraphSynonymQuery, newMultiPhraseQueryBuilder, newSynonymQuery, newTermQuery, setAnalyzer, setAutoGenerateMultiTermSynonymsPhraseQuery, setEnableGraphQueries, setEnablePositionIncrements`

  ### Methods inherited from class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

  ### Methods inherited from interface org.apache.lucene.queryparser.flexible.standard.CommonQueryParserConfiguration

  `getAnalyzer, getEnablePositionIncrements, setEnablePositionIncrements`

- ## Field Details

  - ### DEFAULT_SPLIT_ON_WHITESPACE

    public static final boolean DEFAULT_SPLIT_ON_WHITESPACE
    default split on whitespace behavior
    See Also:
      - Constant Field Values

  - ### token_source

    public QueryParserTokenManager token_source
    Generated Token Manager.

  - ### token

    public Token token
    Current token.

  - ### jj_nt

    public Token jj_nt
    Next token.

- ## Constructor Details

  - ### QueryParser

    public QueryParser(String f, Analyzer a)
    Create a query parser.
    Parameters:
      `f` - the default field for query terms.
      `a` - used to find terms in the query text.

  - ### QueryParser

    protected QueryParser(CharStream stream)
    Constructor with user supplied CharStream.

  - ### QueryParser

    protected QueryParser(QueryParserTokenManager tm)
    Constructor with generated Token Manager.

- ## Method Details

  - ### setAutoGeneratePhraseQueries

    public void setAutoGeneratePhraseQueries(boolean value)
    Set to true if phrase queries will be automatically generated when the analyzer returns more than one term from whitespace delimited text. NOTE: this behavior may not be suitable for all languages.

    Set to false if phrase queries should only be generated when surrounded by double quotes.

    The combination splitOnWhitespace=false and autoGeneratePhraseQueries=true is disallowed. See LUCENE-7533.

    Overrides:
      `setAutoGeneratePhraseQueries` in class `QueryParserBase`

  - ### getSplitOnWhitespace

    public boolean getSplitOnWhitespace()
    See Also:
      - `setSplitOnWhitespace(boolean)`

  - ### setSplitOnWhitespace

    public void setSplitOnWhitespace(boolean splitOnWhitespace)
    Whether query text should be split on whitespace prior to analysis. Default is `false`.

    The combination splitOnWhitespace=false and autoGeneratePhraseQueries=true is disallowed. See LUCENE-7533.

  - ### Conjunction

    public final int Conjunction() throws ParseException
    Throws:
      `ParseException`

  - ### Modifiers

    public final int Modifiers() throws ParseException
    Throws:
      `ParseException`

  - ### TopLevelQuery

    public final Query TopLevelQuery(String field) throws ParseException
    Specified by:
      `TopLevelQuery` in class `QueryParserBase`
    Throws:
      `ParseException`

  - ### Query

    public final Query Query(String field) throws ParseException
    Throws:
      `ParseException`

  - ### Clause

    public final Query Clause(String field) throws ParseException
    Throws:
      `ParseException`

  - ### Term

    public final Query Term(String field) throws ParseException
    Throws:
      `ParseException`

  - ### MultiTerm

    public final Query MultiTerm(String field, List<BooleanClause> clauses) throws ParseException
    Returns the first query if splitOnWhitespace=true or otherwise the entire produced query
    Throws:
      `ParseException`

  - ### ReInit

    public void ReInit(CharStream stream)
    Reinitialise.
    Specified by:
      `ReInit` in class `QueryParserBase`

  - ### ReInit

    public void ReInit(QueryParserTokenManager tm)
    Reinitialise.

  - ### getNextToken

    public final Token getNextToken()
    Get the next Token.

  - ### getToken

    public final Token getToken(int index)
    Get the specific Token.

  - ### generateParseException

    public ParseException generateParseException()
    Generate ParseException.

  - ### trace_enabled

    public final boolean trace_enabled()
    Trace enabled.

  - ### enable_tracing

    public final void enable_tracing()
    Enable tracing.

  - ### disable_tracing

    public final void disable_tracing()
    Disable tracing.