org.jahia.utils

Class LuceneUtils

java.lang.Object

org.jahia.utils.LuceneUtils

public class LuceneUtils
extends Object

An utility class to gather useful methods to work with Lucene.

Author:

Christophe Laprun

Field Summary

Fields

Modifier and Type	Field and Description
static String	DASH

Constructor Summary

Constructors

Constructor and Description
LuceneUtils()

Method Summary

Modifier and Type	Method and Description
static String	extractLanguageOrNullFrom(String fieldName) Extracts a language code from the specified field name if one is there to be found or null otherwise.
static String	extractLanguageOrNullFromStatement(String statement) Extracts the language code that might be available in the form of a jcr:language constraint from the given query statement.
static String	getFullTextFieldName(String siteName, String language) Retrieves the name used for full text fields for the specified site name and language.

Methods inherited from class java.lang.Object

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

Field Detail

DASH

public static final String DASH

See Also:

Constant Field Values

Constructor Detail

LuceneUtils

public LuceneUtils()

Method Detail

getFullTextFieldName

public static String getFullTextFieldName(String siteName,
                                          String language)

Retrieves the name used for full text fields for the specified site name and language.

Parameters:

siteName -

language -

Returns:

extractLanguageOrNullFrom

public static String extractLanguageOrNullFrom(String fieldName)

Extracts a language code from the specified field name if one is there to be found or null otherwise. Note that the way how field names are currently encoded might result in false positives.

Parameters:

fieldName -

Returns:

extractLanguageOrNullFromStatement

public static String extractLanguageOrNullFromStatement(String statement)

Extracts the language code that might be available in the form of a jcr:language constraint from the given query statement. More specifically, the following cases should be properly handled:

• jcr:language = 'en' (in that case analyzer should be English)
• jcr:language = "en" (in that case analyzer should be English)
• jcr:language is null (in that case analyzer cannot be determined by query language - take the default)
• jcr:language is null and jcr:language = 'en' (in that case the query language specific analyzer should be English, but it is set only on the second jcr:language constraint)
• jcr:language <> 'en' (in that case analyzer cannot be determined by query language - take the default)
• jcr:language = 'fr' or jcr:language='en' (in that case analyzer can also not be determined by query language - take the default)
• ([jcr:language] = "en" or [jcr:language] is null) and [someOtherProperty] = "test"

Parameters:

statement - the query statement from which to extract a potential language code

Returns:

the language code associated with the jcr:language constraint if it exists in the specified query statement or null otherwise.