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 and Description
    --- | ---
    `static class` | `QueryParser.Operator` The default operator for parsing queries.

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static 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 and Description
    --- | ---
    `protected` | `QueryParser(CharStream stream)` Constructor with user supplied CharStream.
    `protected` | `QueryParser(QueryParserTokenManager tm)` Constructor with generated Token Manager.
    `` | `QueryParser(String f, Analyzer a)` Create a query parser.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `Query` | `Clause(String field)`
    `int` | `Conjunction()`
    `void` | `disable_tracing()` Disable tracing.
    `void` | `enable_tracing()` Enable tracing.
    `ParseException` | `generateParseException()` Generate ParseException.
    `Token` | `getNextToken()` Get the next Token.
    `boolean` | `getSplitOnWhitespace()`
    `Token` | `getToken(int index)` Get the specific Token.
    `int` | `Modifiers()`
    `Query` | `MultiTerm(String field, List<BooleanClause> clauses)` Returns the first query if splitOnWhitespace=true or otherwise the entire produced query
    `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.
    `Query` | `Term(String field)`
    `Query` | `TopLevelQuery(String field)`

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

      `addClause, addMultiTermClauses, escape, getAllowLeadingWildcard, getAutoGeneratePhraseQueries, getBooleanQuery, getDateResolution, getDefaultOperator, getField, getFieldQuery, getFieldQuery, getFuzzyMinSim, getFuzzyPrefixLength, getFuzzyQuery, getLocale, getMaxDeterminizedStates, getMultiTermRewriteMethod, getPhraseSlop, getPrefixQuery, getRangeQuery, getRegexpQuery, getTimeZone, getWildcardQuery, init, newBooleanClause, newFieldQuery, newFuzzyQuery, newMatchAllDocsQuery, newPrefixQuery, newRangeQuery, newRegexpQuery, newWildcardQuery, parse, setAllowLeadingWildcard, setDateResolution, setDateResolution, setDefaultOperator, setFuzzyMinSim, setFuzzyPrefixLength, setLocale, setMaxDeterminizedStates, 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, createSpanQuery, 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 Detail

    - #### 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 Detail

    - #### 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 Detail

    - #### 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.

    - #### enable_tracing

          public final void enable_tracing()

      Enable tracing.

    - #### disable_tracing

          public final void disable_tracing()

      Disable tracing.

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