Class CollationKeyAnalyzer

  • All Implemented Interfaces:
    Closeable, AutoCloseable

    public final class CollationKeyAnalyzer
    extends Analyzer

    Filters KeywordTokenizer with CollationKeyFilter.

    Converts the token into its CollationKey, and then encodes the CollationKey with IndexableBinaryStringTools, to allow it to be stored as an index term.

    WARNING: Make sure you use exactly the same Collator at index and query time -- CollationKeys are only comparable when produced by the same Collator. Since RuleBasedCollators are not independently versioned, it is unsafe to search against stored CollationKeys unless the following are exactly the same (best practice is to store this information with the index and check that they remain the same at query time):

    1. JVM vendor
    2. JVM version, including patch version
    3. The language (and country and variant, if specified) of the Locale used when constructing the collator via Collator.getInstance(java.util.Locale).
    4. The collation strength used - see Collator.setStrength(int)

    The ICUCollationKeyAnalyzer in the icu package of Lucene's contrib area uses ICU4J's Collator, which makes its its version available, thus allowing collation to be versioned independently from the JVM. ICUCollationKeyAnalyzer is also significantly faster and generates significantly shorter keys than CollationKeyAnalyzer. See http://site.icu-project.org/charts/collation-icu4j-sun for key generation timing and key length comparisons between ICU4J and java.text.Collator over several languages.

    CollationKeys generated by java.text.Collators are not compatible with those those generated by ICU Collators. Specifically, if you use CollationKeyAnalyzer to generate index terms, do not use ICUCollationKeyAnalyzer on the query side, or vice versa.

    • Constructor Detail

      • CollationKeyAnalyzer

        public CollationKeyAnalyzer​(Collator collator)
    • Method Detail

      • tokenStream

        public TokenStream tokenStream​(String fieldName,
                                       Reader reader)
        Description copied from class: Analyzer
        Creates a TokenStream which tokenizes all the text in the provided Reader. Must be able to handle null field name for backward compatibility.
        Specified by:
        tokenStream in class Analyzer
      • reusableTokenStream

        public TokenStream reusableTokenStream​(String fieldName,
                                               Reader reader)
                                        throws IOException
        Description copied from class: Analyzer
        Creates a TokenStream that is allowed to be re-used from the previous time that the same thread called this method. Callers that do not need to use more than one TokenStream at the same time from this analyzer should use this method for better performance.
        Overrides:
        reusableTokenStream in class Analyzer
        Throws:
        IOException