Package org.elasticsearch.common.util

Class LongHash

  • All Implemented Interfaces:
    java.io.Closeable, java.lang.AutoCloseable, Releasable
    public final class LongHash
extends java.lang.Object
    Specialized hash table implementation similar to BytesRefHash that maps long values to ids. Collisions are resolved with open addressing and linear probing, growth is smooth thanks to BigArrays and capacity is always a multiple of 2 for faster identification of buckets. This class is not thread-safe.

    • Constructor Summary

      Constructors 
      Constructor Description
      LongHash​(long capacity, float maxLoadFactor, BigArrays bigArrays)  
      LongHash​(long capacity, BigArrays bigArrays)  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      long add​(long key)
      Try to add key.
      long capacity()
      Return the number of allocated slots to store this hash table.
      void close()  
      long find​(long key)
      Get the id associated with key or -1 if the key is not contained in the hash.
      long get​(long id)
      Return the key at 0 <= index <= capacity().
      protected void grow()  
      long id​(long index)
      Get the id associated with key at 0 <= index <= capacity() or -1 if this slot is unused.
      protected long id​(long index, long id)  
      protected void removeAndAdd​(long index)
      Remove the entry at the given index and add it back
      protected void resize​(long capacity)
      Resize to the given capacity.
      long size()
      Return the number of longs in this hash table.
      protected boolean used​(long bucket)  

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • LongHash

        public LongHash​(long capacity,
                BigArrays bigArrays)

      • LongHash

        public LongHash​(long capacity,
                float maxLoadFactor,
                BigArrays bigArrays)

    • Method Detail

      • get

        public long get​(long id)
        Return the key at 0 <= index <= capacity(). The result is undefined if the slot is unused.

      • find

        public long find​(long key)
        Get the id associated with key or -1 if the key is not contained in the hash.

      • add

        public long add​(long key)
        Try to add key. Return its newly allocated id if it wasn't in the hash table yet, or -1-id if it was already present in the hash table.

      • removeAndAdd

        protected void removeAndAdd​(long index)
        Remove the entry at the given index and add it back

      • close

        public void close()
        Specified by:
        close in interface java.lang.AutoCloseable
        Specified by:
        close in interface java.io.Closeable
        Specified by:
        close in interface Releasable

      • id

        public long id​(long index)
        Get the id associated with key at 0 <= index <= capacity() or -1 if this slot is unused.

      • id

        protected final long id​(long index,
                        long id)

      • resize

        protected void resize​(long capacity)
        Resize to the given capacity.

      • used

        protected boolean used​(long bucket)

      • capacity

        public long capacity()
        Return the number of allocated slots to store this hash table.

      • size

        public long size()
        Return the number of longs in this hash table.

      • grow

        protected final void grow()