Class NGramPhraseQuery

All Implemented Interfaces:
Cloneable

public class NGramPhraseQuery extends PhraseQuery
This is a PhraseQuery which is optimized for n-gram phrase query. For example, when you query "ABCD" on a 2-gram field, you may want to use NGramPhraseQuery rather than PhraseQuery, because NGramPhraseQuery will rewrite(IndexReader) the query to "AB/0 CD/2", while PhraseQuery will query "AB/0 BC/1 CD/2" (where term/position).
  • Constructor Details

    • NGramPhraseQuery

      public NGramPhraseQuery(int n)
      Constructor that takes gram size.
      Parameters:
      n - n-gram size
  • Method Details

    • rewrite

      public Query rewrite(IndexReader reader) 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.
      Overrides:
      rewrite in class PhraseQuery
      Throws:
      IOException
    • equals

      public boolean equals(Object o)
      Returns true iff o is equal to this.
      Overrides:
      equals in class PhraseQuery
    • hashCode

      public int hashCode()
      Returns a hash code value for this object.
      Overrides:
      hashCode in class PhraseQuery