Package gnu.trove.impl.hash

Class TCharHash

  • All Implemented Interfaces:
    java.io.Externalizable, java.io.Serializable
    Direct Known Subclasses:
    TCharHashSet, TCharObjectHashMap
    public abstract class TCharHash
extends TPrimitiveHash
    An open addressed hashing implementation for char primitives. Created: Sun Nov 4 08:56:06 2001
    See Also:
    Serialized Form

    • Field Detail

      • _set

        public transient char[] _set
        the set of chars

      • no_entry_value

        protected char 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 Detail

      • TCharHash

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

      • TCharHash

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

      • TCharHash

        public TCharHash​(int initialCapacity,
                 float loadFactor)
        Creates a new TCharHash 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.

      • TCharHash

        public TCharHash​(int initialCapacity,
                 float loadFactor,
                 char no_entry_value)
        Creates a new TCharHash 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 Detail

      • getNoEntryValue

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

      • forEach

        public boolean forEach​(TCharProcedure 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​(char val)
        Locates the index of val.
        Parameters:
        val - an char value
        Returns:
        the index of val or -1 if it isn't in the set.

      • insertKey

        protected int insertKey​(char 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 char value
        Returns:
        an int value