Package org.apache.lucene.util.compress

Class LZ4.FastCompressionHashTable

  • Enclosing class:
    LZ4
    public static final class LZ4.FastCompressionHashTable
extends LZ4.HashTable
    Simple lossy LZ4.HashTable that only stores the last ocurrence for each hash on 2^14 bytes of memory.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      (package private) boolean assertReset()  
      (package private) int get​(int off)
      Advance the cursor to and return an index that stored the same 4 bytes as b[o:o+4).
      (package private) void initDictionary​(int dictLen)
      Init dictLen bytes to be used as a dictionary.
      int previous​(int off)
      Return an index that less than off and stores the same 4 bytes.
      (package private) void reset​(byte[] bytes, int off, int len)
      Reset this hash table in order to compress the given content.

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • bytes

        private byte[] bytes

      • base

        private int base

      • lastOff

        private int lastOff

      • end

        private int end

      • hashLog

        private int hashLog

    • Constructor Detail

      • FastCompressionHashTable

        public FastCompressionHashTable()
        Sole constructor

    • Method Detail

      • reset

        void reset​(byte[] bytes,
           int off,
           int len)
        Description copied from class: LZ4.HashTable
        Reset this hash table in order to compress the given content.
        Specified by:
        reset in class LZ4.HashTable

      • initDictionary

        void initDictionary​(int dictLen)
        Description copied from class: LZ4.HashTable
        Init dictLen bytes to be used as a dictionary.
        Specified by:
        initDictionary in class LZ4.HashTable

      • get

        int get​(int off)
        Description copied from class: LZ4.HashTable
        Advance the cursor to and return an index that stored the same 4 bytes as b[o:o+4). This may only be called on strictly increasing sequences of offsets. A return value of -1 indicates that no other index could be found.
        Specified by:
        get in class LZ4.HashTable

      • previous

        public int previous​(int off)
        Description copied from class: LZ4.HashTable
        Return an index that less than off and stores the same 4 bytes. Unlike LZ4.HashTable.get(int), it doesn't need to be called on increasing offsets. A return value of -1 indicates that no other index could be found.
        Specified by:
        previous in class LZ4.HashTable