Class Int2ObjectArrayMap<V>

  • All Implemented Interfaces:
    Function<java.lang.Integer,​V>, Int2ObjectFunction<V>, Int2ObjectMap<V>, java.io.Serializable, java.lang.Cloneable, java.util.function.Function<java.lang.Integer,​V>, java.util.function.IntFunction<V>, java.util.Map<java.lang.Integer,​V>

    public class Int2ObjectArrayMap<V>
    extends AbstractInt2ObjectMap<V>
    implements java.io.Serializable, java.lang.Cloneable
    A simple, brute-force implementation of a map based on two parallel backing arrays.

    The main purpose of this implementation is that of wrapping cleanly the brute-force approach to the storage of a very small number of pairs: just put them into two parallel arrays and scan linearly to find an item.

    See Also:
    Serialized Form
    • Constructor Detail

      • Int2ObjectArrayMap

        public Int2ObjectArrayMap​(int[] key,
                                  java.lang.Object[] value)
        Creates a new empty array map with given key and value backing arrays. The resulting map will have as many entries as the given arrays.

        It is responsibility of the caller that the elements of key are distinct.

        Parameters:
        key - the key array.
        value - the value array (it must have the same length as key).
      • Int2ObjectArrayMap

        public Int2ObjectArrayMap()
        Creates a new empty array map.
      • Int2ObjectArrayMap

        public Int2ObjectArrayMap​(int capacity)
        Creates a new empty array map of given capacity.
        Parameters:
        capacity - the initial capacity.
      • Int2ObjectArrayMap

        public Int2ObjectArrayMap​(Int2ObjectMap<V> m)
        Creates a new empty array map copying the entries of a given map.
        Parameters:
        m - a map.
      • Int2ObjectArrayMap

        public Int2ObjectArrayMap​(java.util.Map<? extends java.lang.Integer,​? extends V> m)
        Creates a new empty array map copying the entries of a given map.
        Parameters:
        m - a map.
      • Int2ObjectArrayMap

        public Int2ObjectArrayMap​(int[] key,
                                  java.lang.Object[] value,
                                  int size)
        Creates a new array map with given key and value backing arrays, using the given number of elements.

        It is responsibility of the caller that the first size elements of key are distinct.

        Parameters:
        key - the key array.
        value - the value array (it must have the same length as key).
        size - the number of valid elements in key and value.
    • Method Detail

      • int2ObjectEntrySet

        public Int2ObjectMap.FastEntrySet<V> int2ObjectEntrySet()
        Description copied from interface: Int2ObjectMap
        Returns a type-specific set view of the mappings contained in this map.

        This method is necessary because there is no inheritance along type parameters: it is thus impossible to strengthen Map.entrySet() so that it returns an ObjectSet of type-specific entries (the latter makes it possible to access keys and values with type-specific methods).

        Specified by:
        int2ObjectEntrySet in interface Int2ObjectMap<V>
        Returns:
        a type-specific set view of the mappings contained in this map.
        See Also:
        Map.entrySet()
      • size

        public int size()
        Description copied from interface: Int2ObjectMap
        Returns the number of key/value mappings in this map. If the map contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.
        Specified by:
        size in interface Function<java.lang.Integer,​V>
        Specified by:
        size in interface Int2ObjectMap<V>
        Specified by:
        size in interface java.util.Map<java.lang.Integer,​V>
        Returns:
        the number of key-value mappings in this map.
        See Also:
        Size64
      • clear

        public void clear()
        Description copied from interface: Int2ObjectMap
        Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.
        Specified by:
        clear in interface Function<java.lang.Integer,​V>
        Specified by:
        clear in interface Int2ObjectMap<V>
        Specified by:
        clear in interface java.util.Map<java.lang.Integer,​V>
        See Also:
        Map.clear()
      • isEmpty

        public boolean isEmpty()
        Specified by:
        isEmpty in interface java.util.Map<java.lang.Integer,​V>
        Overrides:
        isEmpty in class AbstractInt2ObjectMap<V>
      • keySet

        public IntSet keySet()
        Description copied from class: AbstractInt2ObjectMap
        Returns a type-specific-set view of the keys of this map.

        The view is backed by the set returned by Map.entrySet(). Note that no attempt is made at caching the result of this method, as this would require adding some attributes that lightweight implementations would not need. Subclasses may easily override this policy by calling this method and caching the result, but implementors are encouraged to write more efficient ad-hoc implementations.

        Specified by:
        keySet in interface Int2ObjectMap<V>
        Specified by:
        keySet in interface java.util.Map<java.lang.Integer,​V>
        Overrides:
        keySet in class AbstractInt2ObjectMap<V>
        Returns:
        a set view of the keys of this map; it may be safely cast to a type-specific interface.
        See Also:
        Map.keySet()
      • values

        public ObjectCollection<V> values()
        Description copied from class: AbstractInt2ObjectMap
        Returns a type-specific-set view of the values of this map.

        The view is backed by the set returned by Map.entrySet(). Note that no attempt is made at caching the result of this method, as this would require adding some attributes that lightweight implementations would not need. Subclasses may easily override this policy by calling this method and caching the result, but implementors are encouraged to write more efficient ad-hoc implementations.

        Specified by:
        values in interface Int2ObjectMap<V>
        Specified by:
        values in interface java.util.Map<java.lang.Integer,​V>
        Overrides:
        values in class AbstractInt2ObjectMap<V>
        Returns:
        a set view of the values of this map; it may be safely cast to a type-specific interface.
        See Also:
        Map.values()
      • clone

        public Int2ObjectArrayMap<V> clone()
        Returns a deep copy of this map.

        This method performs a deep copy of this hash map; the data stored in the map, however, is not cloned. Note that this makes a difference only for object keys.

        Returns:
        a deep copy of this map.