Package ubic.gemma.core.search.lucene

Class LuceneQueryUtils

java.lang.Object

ubic.gemma.core.search.lucene.LuceneQueryUtils

public class LuceneQueryUtils
extends Object

Utilities for parsing search queries using Lucene.

Author:

poirigui

Constructor Summary

Constructors

Constructor	Description
LuceneQueryUtils()

Method Summary

Modifier and Type	Method	Description
static String	escape(String query)	Escape all reserved Lucene characters in the given query.
static Set<String>	extractTerms(SearchSettings settings)	Extract terms, regardless of their logical organization.
static Set<Set<String>>	extractTermsDnf(SearchSettings settings)
static Set<Set<String>>	extractTermsDnf(SearchSettings settings, boolean allowWildcards)	Extract a DNF (Disjunctive Normal Form) from the terms of a query.
static boolean	isWildcard(SearchSettings settings)	Check if the query is a wildcard query.
static org.apache.lucene.search.Query	parseSafely(String query, org.apache.lucene.queryParser.QueryParser queryParser, Consumer<? super org.apache.lucene.queryParser.ParseException> report)	Safely parse the given search query into a Lucene query, falling back on a query with special characters escaped if necessary.
static org.apache.lucene.search.Query	parseSafely(SearchSettings settings, org.apache.lucene.queryParser.QueryParser queryParser)	Safely parse the given search settings into a Lucene query, falling back on a query with special characters escaped if necessary.
static String	prepareDatabaseQuery(String query, boolean allowWildcards)
static String	prepareDatabaseQuery(SearchSettings settings)	Escape the query for a database match.
static String	prepareDatabaseQuery(SearchSettings settings, boolean allowWildcards)	Obtain a query suitable for a database match.
static URI	prepareTermUriQuery(String s)
static URI	prepareTermUriQuery(SearchSettings settings)
static String	quote(String query)	Quote the given Lucene query to be used for an exact match.

Methods inherited from class java.lang.Object

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

Constructor Detail

LuceneQueryUtils

public LuceneQueryUtils()

Method Detail

parseSafely

public static org.apache.lucene.search.Query parseSafely(SearchSettings settings,
                                                         org.apache.lucene.queryParser.QueryParser queryParser)
                                                  throws SearchException

Safely parse the given search settings into a Lucene query, falling back on a query with special characters escaped if necessary.

Throws:

SearchException

parseSafely

public static org.apache.lucene.search.Query parseSafely(String query,
                                                         org.apache.lucene.queryParser.QueryParser queryParser,
                                                         @Nullable
                                                         Consumer<? super org.apache.lucene.queryParser.ParseException> report)
                                                  throws SearchException

Safely parse the given search query into a Lucene query, falling back on a query with special characters escaped if necessary.

Parameters:

report - a consumer for potential ParseException when attempting to parse the query, ignored if null

Throws:

SearchException

escape

public static String escape(String query)

Escape all reserved Lucene characters in the given query.

extractTerms

public static Set<String> extractTerms(SearchSettings settings)
                                throws SearchException

Extract terms, regardless of their logical organization.

Prohibited terms are excluded.

Throws:

SearchException

extractTermsDnf

public static Set<Set<String>> extractTermsDnf(SearchSettings settings)
                                        throws SearchException

Throws:

SearchException

extractTermsDnf

public static Set<Set<String>> extractTermsDnf(SearchSettings settings,
                                               boolean allowWildcards)
                                        throws SearchException

Extract a DNF (Disjunctive Normal Form) from the terms of a query.

Clauses can be nested (i.e. a OR (d OR (c AND (d AND e))) as long as OR and AND are not interleaved.

Prohibited clauses are ignored unless they break the DNF structure, in which case this will return an empty set.

Parameters:

allowWildcards - allow PrefixQuery and WildcardQuery clauses

Throws:

SearchException

prepareDatabaseQuery

@Nullable
public static String prepareDatabaseQuery(SearchSettings settings)
                                   throws SearchException

Escape the query for a database match.

Throws:

SearchException

See Also:

prepareDatabaseQuery(SearchSettings, boolean)

prepareDatabaseQuery

@Nullable
public static String prepareDatabaseQuery(SearchSettings settings,
                                          boolean allowWildcards)
                                   throws SearchException

Obtain a query suitable for a database match.

This method will return the first global term in the query that is not prohibited. If allowWildcards is set to true, prefix and wildcard terms will be considered as well.

The resulting string is free from character that would usually be used for a free-text match unless allowWildcards is set to true.

Parameters:

allowWildcards - if true, wildcards are supported (i.e. '*' and '?') and translated to their corresponding LIKE SQL syntax (i.e. '%' and '_'), all other special characters are escaped.

Returns:

the first suitable term in the query, or null if none of them are applicable for a database query

Throws:

SearchException

prepareDatabaseQuery

@Nullable
public static String prepareDatabaseQuery(String query,
                                          boolean allowWildcards)
                                   throws SearchException

Throws:

SearchException

prepareTermUriQuery

@Nullable
public static URI prepareTermUriQuery(String s)
                               throws SearchException

Throws:

SearchException

prepareTermUriQuery

@Nullable
public static URI prepareTermUriQuery(SearchSettings settings)
                               throws SearchException

Throws:

SearchException

isWildcard

public static boolean isWildcard(SearchSettings settings)

Check if the query is a wildcard query.

quote

public static String quote(String query)

Quote the given Lucene query to be used for an exact match.