Package gnu.trove

Class TByteObjectHashMap<V>

java.lang.Object
gnu.trove.THash
gnu.trove.TPrimitiveHash
gnu.trove.TByteHash
gnu.trove.TByteObjectHashMap<V>
All Implemented Interfaces:
TByteHashingStrategy, Externalizable, Serializable, Cloneable
public class TByteObjectHashMap<V> extends TByteHash implements Externalizable
An open addressed Map implementation for byte keys and Object values. Created: Sun Nov 4 08:52:45 2001
Author:
Eric D. Friedman
See Also:

  • Field Details

    • _values

      protected transient V[] _values
      the values of the map

  • Constructor Details

    • TByteObjectHashMap

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

    • TByteObjectHashMap

      public TByteObjectHashMap(int initialCapacity)
      Creates a new TByteObjectHashMap instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.
      Parameters:
      initialCapacity - an int value

    • TByteObjectHashMap

      public TByteObjectHashMap(int initialCapacity, float loadFactor)
      Creates a new TByteObjectHashMap instance with a prime capacity equal to or greater than initialCapacity and with the specified load factor.
      Parameters:
      initialCapacity - an int value
      loadFactor - a float value

    • TByteObjectHashMap

      public TByteObjectHashMap(TByteHashingStrategy strategy)
      Creates a new TByteObjectHashMap instance with the default capacity and load factor.
      Parameters:
      strategy - used to compute hash codes and to compare keys.

    • TByteObjectHashMap

      public TByteObjectHashMap(int initialCapacity, TByteHashingStrategy strategy)
      Creates a new TByteObjectHashMap instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.
      Parameters:
      initialCapacity - an int value
      strategy - used to compute hash codes and to compare keys.

    • TByteObjectHashMap

      public TByteObjectHashMap(int initialCapacity, float loadFactor, TByteHashingStrategy strategy)
      Creates a new TByteObjectHashMap 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.
      strategy - used to compute hash codes and to compare keys.

  • Method Details

    • clone

      public TByteObjectHashMap<V> clone()
      Overrides:
      clone in class TByteHash
      Returns:
      a deep clone of this collection

    • iterator

      public TByteObjectIterator<V> iterator()
      Returns:
      a TByteObjectIterator with access to this map's keys and values

    • setUp

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

    • put

      public V put(byte key, V value)
      Inserts a key/value pair into the map.
      Parameters:
      key - an byte value
      value - an Object value
      Returns:
      the previous value associated with key, or null if none was found.

    • putIfAbsent

      public V putIfAbsent(byte key, V value)
      Inserts a key/value pair into the map if the specified key is not already associated with a value.
      Parameters:
      key - an byte value
      value - an Object value
      Returns:
      the previous value associated with key, or null if none was found.

    • putAll

      public void putAll(TByteObjectHashMap<V> map)
      Put all the entries from the given map into this map.
      Parameters:
      map - The map from which entries will be obtained to put into this map.

    • rehash

      protected void rehash(int newCapacity)
      rehashes the map to the new capacity.
      Specified by:
      rehash in class THash
      Parameters:
      newCapacity - an int value

    • get

      public V get(byte key)
      retrieves the value for key
      Parameters:
      key - an byte value
      Returns:
      the value of key or (byte)0 if no such mapping exists.

    • clear

      public void clear()
      Empties the map.
      Overrides:
      clear in class THash

    • remove

      public V remove(byte key)
      Deletes a key/value pair from the map.
      Parameters:
      key - an byte value
      Returns:
      an Object value or (byte)0 if no such mapping exists.

    • equals

      public boolean equals(Object other)
      Compares this map with another map for equality of their stored entries.
      Overrides:
      equals in class Object
      Parameters:
      other - an Object value
      Returns:
      a boolean value

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • removeAt

      protected void removeAt(int index)
      removes the mapping at index from the map.
      Overrides:
      removeAt in class TByteHash
      Parameters:
      index - an int value

    • getValues

      public Object[] getValues()
      Returns the values of the map.
      Returns:
      a Collection value
      See Also:

    • getValues

      public <T> T[] getValues(T[] a)
      Return the values of the map; the runtime type of the returned array is that of the specified array.
      Parameters:
      a - the array into which the elements of this collection are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.
      Returns:
      an array containing the elements of this collection
      Throws:
      ArrayStoreException - the runtime type of the specified array is not a supertype of the runtime type of every element in this collection.
      NullPointerException - if the specified array is null.
      See Also:

    • keys

      public byte[] keys()
      returns the keys of the map.
      Returns:
      a Set value

    • keys

      public byte[] keys(byte[] a)
      returns the keys of the map.
      Parameters:
      a - the array into which the elements of the list are to be stored, if it is big enough; otherwise, a new array of the same type is allocated for this purpose.
      Returns:
      a Set value

    • containsValue

      public boolean containsValue(V val)
      checks for the presence of val in the values of the map.
      Parameters:
      val - an Object value
      Returns:
      a boolean value

    • containsKey

      public boolean containsKey(byte key)
      checks for the present of key in the keys of the map.
      Parameters:
      key - an byte value
      Returns:
      a boolean value

    • forEachKey

      public boolean forEachKey(TByteProcedure procedure)
      Executes procedure for each key in the map.
      Parameters:
      procedure - a TByteProcedure value
      Returns:
      false if the loop over the keys terminated because the procedure returned false for some key.

    • forEachValue

      public boolean forEachValue(TObjectProcedure<V> procedure)
      Executes procedure for each value in the map.
      Parameters:
      procedure - a TObjectProcedure value
      Returns:
      false if the loop over the values terminated because the procedure returned false for some value.

    • forEachEntry

      public boolean forEachEntry(TByteObjectProcedure<V> procedure)
      Executes procedure for each key/value entry in the map.
      Parameters:
      procedure - a TOByteObjectProcedure value
      Returns:
      false if the loop over the entries terminated because the procedure returned false for some entry.

    • retainEntries

      public boolean retainEntries(TByteObjectProcedure<V> procedure)
      Retains only those entries in the map for which the procedure returns a true value.
      Parameters:
      procedure - determines which entries to keep
      Returns:
      true if the map was modified.

    • transformValues

      public void transformValues(TObjectFunction<V,V> function)
      Transform the values in this map using function.
      Parameters:
      function - a TObjectFunction value

    • writeExternal

      public void writeExternal(ObjectOutput out) throws IOException
      Specified by:
      writeExternal in interface Externalizable
      Overrides:
      writeExternal in class THash
      Throws:
      IOException

    • readExternal

      public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
      Specified by:
      readExternal in interface Externalizable
      Overrides:
      readExternal in class THash
      Throws:
      IOException
      ClassNotFoundException

    • toString

      public String toString()
      Overrides:
      toString in class Object