Package org.apache.wicket.util.collections

Class IntHashMap<V>

  • Type Parameters:
    V - The value in the map
    All Implemented Interfaces:
    Serializable, Cloneable
    public class IntHashMap<V>
extends Object
implements Cloneable, Serializable
    This is an integer hashmap that has the exact same features and interface as a normal Map except that the key is directly an integer. So no hash is calculated or key object is stored.
    Author:
    jcompagner
    See Also:
    Serialized Form

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description
      static class  IntHashMap.Entry<V>  

    • Constructor Summary

      Constructors 
      Constructor Description
      IntHashMap()
      Constructs an empty HashMap with the default initial capacity (16) and the default load factor (0.75).
      IntHashMap​(int initialCapacity)
      Constructs an empty HashMap with the specified initial capacity and the default load factor (0.75).
      IntHashMap​(int initialCapacity, float loadFactor)
      Constructs an empty HashMap with the specified initial capacity and load factor.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void clear()
      Removes all mappings from this map.
      Object clone()
      Returns a shallow copy of this HashMap instance: the keys and values themselves are not cloned.
      boolean containsKey​(int key)
      Returns true if this map contains a mapping for the specified key.
      boolean containsValue​(Object value)
      Returns true if this map maps one or more keys to the specified value.
      Set<IntHashMap.Entry<V>> entrySet()
      Returns a collection view of the mappings contained in this map.
      V get​(int key)
      Returns the value to which the specified key is mapped in this identity hash map, or null if the map contains no mapping for this key.
      boolean isEmpty()
      Returns true if this map contains no key-value mappings.
      Set<Integer> keySet()
      Returns a set view of the keys contained in this map.
      V put​(int key, V value)
      Associates the specified value with the specified key in this map.
      void putAll​(IntHashMap<V> m)
      Copies all of the mappings from the specified map to this map These mappings will replace any mappings that this map had for any of the keys currently in the specified map.
      V remove​(int key)
      Removes the mapping for this key from this map if present.
      int size()
      Returns the number of key-value mappings in this map.
      Collection<V> values()
      Returns a collection view of the values contained in this map.

    • Constructor Detail

      • IntHashMap

        public IntHashMap​(int initialCapacity,
                  float loadFactor)
        Constructs an empty HashMap with the specified initial capacity and load factor.
        Parameters:
        initialCapacity - The initial capacity.
        loadFactor - The load factor.
        Throws:
        IllegalArgumentException - if the initial capacity is negative or the load factor is nonpositive.

      • IntHashMap

        public IntHashMap​(int initialCapacity)
        Constructs an empty HashMap with the specified initial capacity and the default load factor (0.75).
        Parameters:
        initialCapacity - the initial capacity.
        Throws:
        IllegalArgumentException - if the initial capacity is negative.

      • IntHashMap

        public IntHashMap()
        Constructs an empty HashMap with the default initial capacity (16) and the default load factor (0.75).

    • Method Detail

      • size

        public int size()
        Returns the number of key-value mappings in this map.
        Returns:
        the number of key-value mappings in this map.

      • isEmpty

        public boolean isEmpty()
        Returns true if this map contains no key-value mappings.
        Returns:
        true if this map contains no key-value mappings.

      • get

        public V get​(int key)
        Returns the value to which the specified key is mapped in this identity hash map, or null if the map contains no mapping for this key. A return value of null does not necessarily indicate that the map contains no mapping for the key; it is also possible that the map explicitly maps the key to null. The containsKey method may be used to distinguish these two cases.
        Parameters:
        key - the key whose associated value is to be returned.
        Returns:
        the value to which this map maps the specified key, or null if the map contains no mapping for this key.
        See Also:
        put(int, Object)

      • containsKey

        public boolean containsKey​(int key)
        Returns true if this map contains a mapping for the specified key.
        Parameters:
        key - The key whose presence in this map is to be tested
        Returns:
        true if this map contains a mapping for the specified key.

      • put

        public V put​(int key,
             V value)
        Associates the specified value with the specified key in this map. If the map previously contained a mapping for this key, the old value is replaced.
        Parameters:
        key - key with which the specified value is to be associated.
        value - value to be associated with the specified key.
        Returns:
        previous value associated with specified key, or null if there was no mapping for key. A null return can also indicate that the HashMap previously associated null with the specified key.

      • putAll

        public void putAll​(IntHashMap<V> m)
        Copies all of the mappings from the specified map to this map These mappings will replace any mappings that this map had for any of the keys currently in the specified map.
        Parameters:
        m - mappings to be stored in this map.
        Throws:
        NullPointerException - if the specified map is null.

      • remove

        public V remove​(int key)
        Removes the mapping for this key from this map if present.
        Parameters:
        key - key whose mapping is to be removed from the map.
        Returns:
        previous value associated with specified key, or null if there was no mapping for key. A null return can also indicate that the map previously associated null with the specified key.

      • clear

        public void clear()
        Removes all mappings from this map.

      • containsValue

        public boolean containsValue​(Object value)
        Returns true if this map maps one or more keys to the specified value.
        Parameters:
        value - value whose presence in this map is to be tested.
        Returns:
        true if this map maps one or more keys to the specified value.

      • keySet

        public Set<Integer> keySet()
        Returns a set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. The set supports element removal, which removes the corresponding mapping from this map, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.
        Returns:
        a set view of the keys contained in this map.

      • values

        public Collection<V> values()
        Returns a collection view of the values contained in this map. The collection is backed by the map, so changes to the map are reflected in the collection, and vice-versa. The collection supports element removal, which removes the corresponding mapping from this map, via the Iterator.remove, Collection.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.
        Returns:
        a collection view of the values contained in this map.

      • entrySet

        public Set<IntHashMap.Entry<V>> entrySet()
        Returns a collection view of the mappings contained in this map. Each element in the returned collection is a Map.Entry. The collection is backed by the map, so changes to the map are reflected in the collection, and vice-versa. The collection supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Collection.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.
        Returns:
        a collection view of the mappings contained in this map.
        See Also:
        Map.Entry