Class NearestFuzzyQuery


  • public class NearestFuzzyQuery
    extends Query
    Simplification of FuzzyLikeThisQuery, to be used in the context of KNN classification.
    • Constructor Detail

      • NearestFuzzyQuery

        public NearestFuzzyQuery​(Analyzer analyzer)
        Default constructor
        Parameters:
        analyzer - the analyzer used to process the query text
    • Method Detail

      • addTerms

        public void addTerms​(java.lang.String queryString,
                             java.lang.String fieldName)
        Adds user input for "fuzzification"
        Parameters:
        queryString - The string which will be parsed by the analyzer and for which fuzzy variants will be parsed
      • idf

        private float idf​(int docFreq,
                          int docCount)
      • newTermQuery

        private Query newTermQuery​(IndexReader reader,
                                   Term term)
                            throws java.io.IOException
        Throws:
        java.io.IOException
      • rewrite

        public Query rewrite​(IndexSearcher indexSearcher)
                      throws java.io.IOException
        Description copied from class: Query
        Expert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.

        Callers are expected to call rewrite multiple times if necessary, until the rewritten query is the same as the original query.

        The rewrite process may be able to make use of IndexSearcher's executor and be executed in parallel if the executor is provided.

        However, if any of the intermediary queries do not satisfy the new API, parallel rewrite is not possible for any subsequent sub-queries. To take advantage of this API, the entire query tree must override this method.

        Overrides:
        rewrite in class Query
        Throws:
        java.io.IOException
        See Also:
        IndexSearcher.rewrite(Query)
      • toString

        public java.lang.String toString​(java.lang.String field)
        Description copied from class: Query
        Prints a query to a string, with field assumed to be the default field and omitted.
        Specified by:
        toString in class Query
      • hashCode

        public int hashCode()
        Description copied from class: Query
        Override and implement query hash code properly in a subclass. This is required so that QueryCache works properly.
        Specified by:
        hashCode in class Query
        See Also:
        Query.equals(Object)
      • equals

        public boolean equals​(java.lang.Object other)
        Description copied from class: Query
        Override and implement query instance equivalence properly in a subclass. This is required so that QueryCache works properly.

        Typically a query will be equal to another only if it's an instance of the same class and its document-filtering properties are identical to those of the other instance. Utility methods are provided for certain repetitive code.

        Specified by:
        equals in class Query
        See Also:
        Query.sameClassAs(Object), Query.classHash()
      • visit

        public void visit​(QueryVisitor visitor)
        Description copied from class: Query
        Recurse through the query tree, visiting any child queries.
        Specified by:
        visit in class Query
        Parameters:
        visitor - a QueryVisitor to be called by each query in the tree