Package gnu.trove.impl.hash

Class TDoubleHash

java.lang.Object
gnu.trove.impl.hash.THash
gnu.trove.impl.hash.TPrimitiveHash
gnu.trove.impl.hash.TDoubleHash
All Implemented Interfaces:
Externalizable, Serializable
Direct Known Subclasses:
TDoubleHashSet, TDoubleObjectHashMap
public abstract class TDoubleHash extends TPrimitiveHash
An open addressed hashing implementation for double primitives. Created: Sun Nov 4 08:56:06 2001
See Also:

  • Field Details

    • _set

      public transient double[] _set
      the set of doubles

    • no_entry_value

      protected double no_entry_value
      value that represents null NOTE: should not be modified after the Hash is created, but is not final because of Externalization

    • consumeFreeSlot

      protected boolean consumeFreeSlot

  • Constructor Details

    • TDoubleHash

      public TDoubleHash()
      Creates a new TDoubleHash instance with the default capacity and load factor.

    • TDoubleHash

      public TDoubleHash(int initialCapacity)
      Creates a new TDoubleHash instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.
      Parameters:
      initialCapacity - an int value

    • TDoubleHash

      public TDoubleHash(int initialCapacity, float loadFactor)
      Creates a new TDoubleHash instance with a prime value at or near the specified capacity and load factor.
      Parameters:
      initialCapacity - used to find a prime capacity for the table.
      loadFactor - used to calculate the threshold over which rehashing takes place.

    • TDoubleHash

      public TDoubleHash(int initialCapacity, float loadFactor, double no_entry_value)
      Creates a new TDoubleHash instance with a prime value at or near the specified capacity and load factor.
      Parameters:
      initialCapacity - used to find a prime capacity for the table.
      loadFactor - used to calculate the threshold over which rehashing takes place.
      no_entry_value - value that represents null

  • Method Details

    • getNoEntryValue

      public double getNoEntryValue()
      Returns the value that is used to represent null. The default value is generally zero, but can be changed during construction of the collection.
      Returns:
      the value that represents null

    • setUp

      protected int setUp(int initialCapacity)
      initializes the hashtable to a prime capacity which is at least initialCapacity + 1.
      Overrides:
      setUp in class TPrimitiveHash
      Parameters:
      initialCapacity - an int value
      Returns:
      the actual capacity chosen

    • contains

      public boolean contains(double val)
      Searches the set for val
      Parameters:
      val - an double value
      Returns:
      a boolean value

    • forEach

      public boolean forEach(TDoubleProcedure procedure)
      Executes procedure for each element in the set.
      Parameters:
      procedure - a TObjectProcedure value
      Returns:
      false if the loop over the set terminated because the procedure returned false for some value.

    • removeAt

      protected void removeAt(int index)
      Releases the element currently stored at index.
      Overrides:
      removeAt in class TPrimitiveHash
      Parameters:
      index - an int value

    • index

      protected int index(double val)
      Locates the index of val.
      Parameters:
      val - an double value
      Returns:
      the index of val or -1 if it isn't in the set.

    • insertKey

      protected int insertKey(double val)
      Locates the index at which val can be inserted. if there is already a value equal()ing val in the set, returns that value as a negative integer.
      Parameters:
      val - an double value
      Returns:
      an int value