Module org.apache.lucene.core
Package org.apache.lucene.util.bkd

Class BKDUtil

java.lang.Object
org.apache.lucene.util.bkd.BKDUtil
final class BKDUtil extends Object
Utility functions to build BKD trees.

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Class
    Description
    static interface 
    BKDUtil.ByteArrayPredicate
    Predicate for a fixed number of bytes.

  • Constructor Summary

    Constructors
    Modifier
    Constructor
    Description
    private
    BKDUtil()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static int
    commonPrefixLength4(byte[] a, int aOffset, byte[] b, int bOffset)
    Return the length of the common prefix across the next 4 bytes of both provided arrays.
    static int
    commonPrefixLength8(byte[] a, int aOffset, byte[] b, int bOffset)
    Return the length of the common prefix across the next 8 bytes of both provided arrays.
    (package private) static int
    commonPrefixLengthN(byte[] a, int aOffset, byte[] b, int bOffset, int numBytes)
     
    static boolean
    equals4(byte[] a, int aOffset, byte[] b, int bOffset)
    Check whether the next 4 bytes are exactly the same in the provided arrays.
    static boolean
    equals8(byte[] a, int aOffset, byte[] b, int bOffset)
    Check whether the next 8 bytes are exactly the same in the provided arrays.
    static BKDUtil.ByteArrayPredicate
    getEqualsPredicate(int numBytes)
    Return a predicate that tells whether the next numBytes bytes are equal.
    static ArrayUtil.ByteArrayComparator
    getPrefixLengthComparator(int numBytes)
    Return a comparator that computes the common prefix length across the next numBytes of the provided arrays.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • BKDUtil

      private BKDUtil()

  • Method Details

    • getPrefixLengthComparator

      public static ArrayUtil.ByteArrayComparator getPrefixLengthComparator(int numBytes)
      Return a comparator that computes the common prefix length across the next numBytes of the provided arrays.

    • commonPrefixLength8

      public static int commonPrefixLength8(byte[] a, int aOffset, byte[] b, int bOffset)
      Return the length of the common prefix across the next 8 bytes of both provided arrays.

    • commonPrefixLength4

      public static int commonPrefixLength4(byte[] a, int aOffset, byte[] b, int bOffset)
      Return the length of the common prefix across the next 4 bytes of both provided arrays.

    • commonPrefixLengthN

      static int commonPrefixLengthN(byte[] a, int aOffset, byte[] b, int bOffset, int numBytes)

    • getEqualsPredicate

      public static BKDUtil.ByteArrayPredicate getEqualsPredicate(int numBytes)
      Return a predicate that tells whether the next numBytes bytes are equal.

    • equals8

      public static boolean equals8(byte[] a, int aOffset, byte[] b, int bOffset)
      Check whether the next 8 bytes are exactly the same in the provided arrays.

    • equals4

      public static boolean equals4(byte[] a, int aOffset, byte[] b, int bOffset)
      Check whether the next 4 bytes are exactly the same in the provided arrays.