AnalyzingQueryParser (Lucene 2.4.1 API)
Keywords: org.apache.lucene.queryParser.analyzing.AnalyzingQueryParser class

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## org.apache.lucene.queryParser.analyzing
Class AnalyzingQueryParser

    java.lang.Object
      org.apache.lucene.queryParser.QueryParser
          org.apache.lucene.queryParser.analyzing.AnalyzingQueryParser

All Implemented Interfaces:
  QueryParserConstants

    public class AnalyzingQueryParser

extends QueryParser

Overrides Lucene's default QueryParser so that Fuzzy-, Prefix-, Range-, and WildcardQuerys are also passed through the given analyzer, but wild card characters (like `*`) don't get removed from the search terms.

Warning: This class should only be used with analyzers that do not use stopwords or that add tokens. Also, several stemming analyzers are inappropriate: for example, GermanAnalyzer will turn `Häuser` into `hau`, but `H?user` will become `h?user` when using this parser and thus no match would be found (i.e. using this parser will be no improvement over QueryParser in such cases).

Version:
  $Revision$, $Date$

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.queryParser.QueryParser
`QueryParser.Operator`

Field Summary

Fields inherited from class org.apache.lucene.queryParser.QueryParser
`AND_OPERATOR, jj_nt, OR_OPERATOR, token, token_source`

Fields inherited from interface org.apache.lucene.queryParser.QueryParserConstants
`_ESCAPED_CHAR, _NUM_CHAR, _QUOTED_CHAR, _TERM_CHAR, _TERM_START_CHAR, _WHITESPACE, AND, Boost, CARAT, COLON, DEFAULT, EOF, FUZZY_SLOP, LPAREN, MINUS, NOT, NUMBER, OR, PLUS, PREFIXTERM, QUOTED, RangeEx, RANGEEX_END, RANGEEX_GOOP, RANGEEX_QUOTED, RANGEEX_START, RANGEEX_TO, RangeIn, RANGEIN_END, RANGEIN_GOOP, RANGEIN_QUOTED, RANGEIN_START, RANGEIN_TO, RPAREN, STAR, TERM, tokenImage, WILDTERM`

Constructor Summary
`AnalyzingQueryParser(String field, Analyzer analyzer)` Constructs a query parser.

Method Summary
`protected Query` | `getFuzzyQuery(String field, String termStr, float minSimilarity)` Called when parser parses an input term token that has the fuzzy suffix (~) appended.
`protected Query` | `getPrefixQuery(String field, String termStr)` Called when parser parses an input term token that uses prefix notation; that is, contains a single '*' wildcard character as its last character.
`protected Query` | `getRangeQuery(String field, String part1, String part2, boolean inclusive)` Overrides super class, by passing terms through analyzer.
`protected Query` | `getWildcardQuery(String field, String termStr)` Called when parser parses an input term token that contains one or more wildcard characters (like `*`), but is not a prefix term token (one that has just a single * character at the end).

Methods inherited from class org.apache.lucene.queryParser.QueryParser
`addClause, addClause, Clause, Conjunction, disable_tracing, enable_tracing, escape, generateParseException, getAllowLeadingWildcard, getAnalyzer, getBooleanQuery, getBooleanQuery, getBooleanQuery, getBooleanQuery, getDateResolution, getDefaultOperator, getEnablePositionIncrements, getField, getFieldQuery, getFieldQuery, getFuzzyMinSim, getFuzzyPrefixLength, getLocale, getLowercaseExpandedTerms, getNextToken, getPhraseSlop, getRangeCollator, getToken, getUseOldRangeQuery, main, Modifiers, newBooleanClause, newBooleanQuery, newFuzzyQuery, newMatchAllDocsQuery, newMultiPhraseQuery, newPhraseQuery, newPrefixQuery, newRangeQuery, newTermQuery, newWildcardQuery, parse, Query, ReInit, ReInit, setAllowLeadingWildcard, setDateResolution, setDateResolution, setDefaultOperator, setEnablePositionIncrements, setFuzzyMinSim, setFuzzyPrefixLength, setLocale, setLowercaseExpandedTerms, setPhraseSlop, setRangeCollator, setUseOldRangeQuery, Term, TopLevelQuery`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### AnalyzingQueryParser

    public AnalyzingQueryParser(String field,
                                Analyzer analyzer)

  Constructs a query parser.

  Parameters:
    `field` - the default field for query terms.
    `analyzer` - used to find terms in the query text.

Method Detail

### getWildcardQuery

    protected Query getWildcardQuery(String field,
                                     String termStr)
                              throws ParseException

  Called when parser parses an input term token that contains one or more wildcard characters (like `*`), but is not a prefix term token (one that has just a single * character at the end).

  Example: will be called for `H?user` or for `H*user` but not for `*user`.

  Depending on analyzer and settings, a wildcard term may (most probably will) be lower-cased automatically. It will go through the default Analyzer.

  Overrides super class, by passing terms through analyzer.

  Overrides:
    `getWildcardQuery` in class `QueryParser`
  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`

### getPrefixQuery

    protected Query getPrefixQuery(String field,
                                   String termStr)
                            throws ParseException

  Called when parser parses an input term token that uses prefix notation; that is, contains a single '*' wildcard character as its last character. Since this is a special case of generic wildcard term, and such a query can be optimized easily, this usually results in a different query object.

  Depending on analyzer and settings, a prefix term may (most probably will) be lower-cased automatically. It will go through the default Analyzer.

  Overrides super class, by passing terms through analyzer.

  Overrides:
    `getPrefixQuery` in class `QueryParser`
  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`

### getFuzzyQuery

    protected Query getFuzzyQuery(String field,
                                  String termStr,
                                  float minSimilarity)
                           throws ParseException

  Called when parser parses an input term token that has the fuzzy suffix (~) appended.

  Depending on analyzer and settings, a fuzzy term may (most probably will) be lower-cased automatically. It will go through the default Analyzer.

  Overrides super class, by passing terms through analyzer.

  Overrides:
    `getFuzzyQuery` in class `QueryParser`
  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`

### getRangeQuery

    protected Query getRangeQuery(String field,
                                  String part1,
                                  String part2,
                                  boolean inclusive)
                           throws ParseException

  Overrides super class, by passing terms through analyzer.

  Overrides:
    `getRangeQuery` in class `QueryParser`
  Throws:
    `ParseException`

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