java.lang.Object
org.apache.lucene.search.Query
org.apache.lucene.classification.utils.NearestFuzzyQuery

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

  • Constructor Details

    • NearestFuzzyQuery

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

    • addTerms

      public void addTerms(String queryString, 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
    • addTerms

      Throws:
      IOException
    • idf

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

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

      public Query rewrite(IndexSearcher indexSearcher) throws 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.

      Overrides:
      rewrite in class Query
      Throws:
      IOException
      See Also:
    • toString

      public String toString(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:
    • equals

      public boolean equals(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:
    • equalsTo

      private boolean equalsTo(NearestFuzzyQuery other)
    • 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