com.jalios.jcms.search.queryparser

Class DefaultQueryParser

java.lang.Object

org.apache.lucene.util.QueryBuilder

org.apache.lucene.queryparser.classic.QueryParserBase

org.apache.lucene.queryparser.classic.QueryParser

com.jalios.jcms.search.queryparser.DefaultQueryParser

All Implemented Interfaces:

org.apache.lucene.queryparser.classic.QueryParserConstants, org.apache.lucene.queryparser.flexible.standard.CommonQueryParserConfiguration

public class DefaultQueryParser
extends org.apache.lucene.queryparser.classic.QueryParser

Classic QueryParser with some added feature.

Automatic right truncation if enabled with property query.lucene.use-right-truncation.

Additionnal behavior can be configured through properties :

• Disable wildcard query through property query.lucene.wildcard.enabled.
• Disable fuzzy query through property query.lucene.fuzzy.enabled.

Since:

jcms-10.0

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.queryparser.classic.QueryParser

org.apache.lucene.queryparser.classic.QueryParser.Operator

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	LUCENE_FUZZY_ENABLED
static boolean	LUCENE_WILDCARD_ENABLED
static java.lang.String	RIGHT_TRUNCATION_EXCLUSION_REGEX A regular expression used to match words in user's search string for which right truncation will NOT be applied.
static boolean	USE_RIGHT_TRUNCATION

Fields inherited from class org.apache.lucene.queryparser.classic.QueryParser

DEFAULT_SPLIT_ON_WHITESPACE, jj_nt, token, token_source

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, 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

Constructor and Description
DefaultQueryParser(java.lang.String field, org.apache.lucene.analysis.Analyzer analyzer, ParseOptions options) Builds a new DefaultQueryParser.

Method Summary

Modifier and Type	Method and Description
static float	getFieldBoost(ParseOptions.Engine engine, java.lang.String fieldName) Return the boost that should be applied to a field at query time for text search.
protected org.apache.lucene.search.Query	getFuzzyQuery(java.lang.String field, java.lang.String termStr, float minSimilarity) Disable fuzzy query.
protected org.apache.lucene.search.Query	getWildcardQuery(java.lang.String field, java.lang.String termStr) Disable wildcard query.
protected org.apache.lucene.search.Query	newTermQuery(org.apache.lucene.index.Term term)
static org.apache.lucene.search.Query	parse(java.lang.String searchString, ParseOptions options, org.apache.lucene.analysis.Analyzer analyzer) Invoked by JCMS Lucene search engines to parse query.
static java.lang.String	rewriteSearchString(java.lang.String searchString, ParseOptions options) Compute the search string to use from the specified options

Methods inherited from class org.apache.lucene.queryparser.classic.QueryParser

Clause, Conjunction, disable_tracing, enable_tracing, generateParseException, getNextToken, getSplitOnWhitespace, getToken, Modifiers, MultiTerm, Query, ReInit, ReInit, setAutoGeneratePhraseQueries, setSplitOnWhitespace, Term, TopLevelQuery

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

addClause, addMultiTermClauses, escape, getAllowLeadingWildcard, getAnalyzeRangeTerms, getAutoGeneratePhraseQueries, getBooleanQuery, getDateResolution, getDefaultOperator, getField, getFieldQuery, getFieldQuery, getFuzzyMinSim, getFuzzyPrefixLength, getLocale, getLowercaseExpandedTerms, getMaxDeterminizedStates, getMultiTermRewriteMethod, getPhraseSlop, getPrefixQuery, getRangeQuery, getRegexpQuery, getTimeZone, init, newBooleanClause, newFieldQuery, newFuzzyQuery, newMatchAllDocsQuery, newPrefixQuery, newRangeQuery, newRegexpQuery, newWildcardQuery, parse, setAllowLeadingWildcard, setAnalyzeRangeTerms, setDateResolution, setDateResolution, setDefaultOperator, setFuzzyMinSim, setFuzzyPrefixLength, setLocale, setLowercaseExpandedTerms, setMaxDeterminizedStates, setMultiTermRewriteMethod, setPhraseSlop, setTimeZone

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

add, analyzeBoolean, analyzeGraph, analyzeMultiBoolean, analyzeMultiPhrase, analyzePhrase, analyzeTerm, createBooleanQuery, createBooleanQuery, createFieldQuery, createFieldQuery, createMinShouldMatchQuery, createPhraseQuery, createPhraseQuery, getAnalyzer, getEnableGraphQueries, getEnablePositionIncrements, newBooleanQuery, newMultiPhraseQueryBuilder, newSynonymQuery, setAnalyzer, 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

LUCENE_WILDCARD_ENABLED

public static final boolean LUCENE_WILDCARD_ENABLED

LUCENE_FUZZY_ENABLED

public static final boolean LUCENE_FUZZY_ENABLED

USE_RIGHT_TRUNCATION

public static final boolean USE_RIGHT_TRUNCATION

RIGHT_TRUNCATION_EXCLUSION_REGEX

public static final java.lang.String RIGHT_TRUNCATION_EXCLUSION_REGEX

A regular expression used to match words in user's search string for which right truncation will NOT be applied.

Default regex applies to :

• punctuation...
• words ending with punctuation (for example "said" and "world" in : "john said: hello world!")
• numbers, as we want to match them precisely (it also prevents TooManyBoolean with big index)

Constructor Detail

DefaultQueryParser

public DefaultQueryParser(java.lang.String field,
                          org.apache.lucene.analysis.Analyzer analyzer,
                          ParseOptions options)

Builds a new DefaultQueryParser.

Parameters:

field - the default field for query terms.

analyzer - used to find terms in the query text.

options - parsing options

Method Detail

getWildcardQuery

protected org.apache.lucene.search.Query getWildcardQuery(java.lang.String field,
                                                          java.lang.String termStr)
                                                   throws org.apache.lucene.queryparser.classic.ParseException

Disable wildcard query.

Overrides:

getWildcardQuery in class org.apache.lucene.queryparser.classic.QueryParserBase

Throws:

org.apache.lucene.queryparser.classic.ParseException

getFuzzyQuery

protected org.apache.lucene.search.Query getFuzzyQuery(java.lang.String field,
                                                       java.lang.String termStr,
                                                       float minSimilarity)
                                                throws org.apache.lucene.queryparser.classic.ParseException

Disable fuzzy query.

Overrides:

getFuzzyQuery in class org.apache.lucene.queryparser.classic.QueryParserBase

Throws:

org.apache.lucene.queryparser.classic.ParseException

newTermQuery

protected org.apache.lucene.search.Query newTermQuery(org.apache.lucene.index.Term term)

Overrides:

newTermQuery in class org.apache.lucene.util.QueryBuilder

parse

public static org.apache.lucene.search.Query parse(java.lang.String searchString,
                                                   ParseOptions options,
                                                   org.apache.lucene.analysis.Analyzer analyzer)
                                            throws org.apache.lucene.queryparser.classic.ParseException

Invoked by JCMS Lucene search engines to parse query.

Parameters:

searchString - the string to search/parse

options - parsing options

analyzer - TODO

Returns:

a new Query instance

Throws:

org.apache.lucene.queryparser.classic.ParseException - if lucene query was invalid

Since:

jcms-10.0.0

rewriteSearchString

public static java.lang.String rewriteSearchString(java.lang.String searchString,
                                                   ParseOptions options)

Compute the search string to use from the specified options

Parameters:

searchString - the string to search

options - a SearchOptions instance holder of search parameters

Returns:

a String modified to be suitable for lucene search.

getFieldBoost

public static float getFieldBoost(ParseOptions.Engine engine,
                                  java.lang.String fieldName)

Return the boost that should be applied to a field at query time for text search.

Boost value are being read from property declaration :

query.lucene.boost.{search-engine-name}.{field-name}: 2.0

For example :

   query.lucene.boost.PUBLICATION.title: 2.0
   query.lucene.boost.CATEGORY.name: 1.2
   query.lucene.boost.PUBLICATION._allfields_: 1.0
 

Parameters:

engine - the search engine in which search is performed

fieldName - the field name being search and for which a Query object is being built

Returns:

a float noting the boost value of the field to apply to the Query object