it.unimi.dsi.fastutil.ints
Class Int2ObjectArrayMap<V>

java.lang.Object
  extended by it.unimi.dsi.fastutil.ints.AbstractInt2ObjectFunction<V>
      extended by it.unimi.dsi.fastutil.ints.AbstractInt2ObjectMap<V>
          extended by it.unimi.dsi.fastutil.ints.Int2ObjectArrayMap<V>
All Implemented Interfaces:
Function<Integer,V>, Int2ObjectFunction<V>, Int2ObjectMap<V>, Serializable, Cloneable, Map<Integer,V>

public class Int2ObjectArrayMap<V>
extends AbstractInt2ObjectMap<V>
implements Serializable, 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

Nested Class Summary
 
Nested classes/interfaces inherited from class it.unimi.dsi.fastutil.ints.AbstractInt2ObjectMap
AbstractInt2ObjectMap.BasicEntry<V>
 
Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.ints.Int2ObjectMap
Int2ObjectMap.Entry<V>, Int2ObjectMap.FastEntrySet<V>
 
Field Summary
 
Fields inherited from class it.unimi.dsi.fastutil.ints.AbstractInt2ObjectFunction
defRetValue
 
Constructor Summary
Int2ObjectArrayMap()
          Creates a new empty array map.
Int2ObjectArrayMap(int capacity)
          Creates a new empty array map of given capacity.
Int2ObjectArrayMap(int[] key, Object[] value)
          Creates a new empty array map with given key and value backing arrays.
Int2ObjectArrayMap(int[] key, Object[] value, int size)
          Creates a new array map with given key and value backing arrays, using the given number of elements.
Int2ObjectArrayMap(Int2ObjectMap<V> m)
          Creates a new empty array map copying the entries of a given map.
Int2ObjectArrayMap(Map<? extends Integer,? extends V> m)
          Creates a new empty array map copying the entries of a given map.
 
Method Summary
 void clear()
          Removes all associations from this function (optional operation).
 Int2ObjectArrayMap<V> clone()
          Returns a deep copy of this map.
 boolean containsKey(int k)
          Checks whether the given value is contained in AbstractInt2ObjectMap.keySet().
 boolean containsValue(Object v)
          Checks whether the given value is contained in AbstractInt2ObjectMap.values().
 V get(int k)
          Returns the value to which the given key is mapped.
 Int2ObjectMap.FastEntrySet<V> int2ObjectEntrySet()
          Returns a type-specific set view of the mappings contained in this map.
 boolean isEmpty()
           
 IntSet keySet()
          Returns a type-specific-set view of the keys of this map.
 V put(int k, V v)
          Adds a pair to the map.
 V remove(int k)
          Removes the mapping with the given key.
 int size()
          Returns the intended number of keys in this function, or -1 if no such number exists.
 ObjectCollection<V> values()
          Returns a type-specific-set view of the values of this map.
 
Methods inherited from class it.unimi.dsi.fastutil.ints.AbstractInt2ObjectMap
entrySet, equals, hashCode, putAll, toString
 
Methods inherited from class it.unimi.dsi.fastutil.ints.AbstractInt2ObjectFunction
containsKey, defaultReturnValue, defaultReturnValue, get, put, remove
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface it.unimi.dsi.fastutil.ints.Int2ObjectFunction
defaultReturnValue, defaultReturnValue
 
Methods inherited from interface it.unimi.dsi.fastutil.Function
containsKey, get, put, remove
 
Methods inherited from interface java.util.Map
containsKey, get, put, remove
 

Constructor Detail

Int2ObjectArrayMap

public Int2ObjectArrayMap(int[] key,
                          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(Map<? extends 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,
                          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 Int2ObjectMap.entrySet() so that it returns an ObjectSet of objects of type Int2ObjectMap.Entry (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:
Int2ObjectMap.entrySet()

get

public V get(int k)
Description copied from interface: Int2ObjectFunction
Returns the value to which the given key is mapped.

Specified by:
get in interface Int2ObjectFunction<V>
Parameters:
k - the key.
Returns:
the corresponding value, or the default return value if no value was present for the given key.
See Also:
Function.get(Object)

size

public int size()
Description copied from interface: Function
Returns the intended number of keys in this function, or -1 if no such number exists.

Most function implementations will have some knowledge of the intended number of keys in their domain. In some cases, however, this might not be possible.

Specified by:
size in interface Function<Integer,V>
Specified by:
size in interface Map<Integer,V>
Returns:
the intended number of keys in this function, or -1 if that number is not available.

clear

public void clear()
Description copied from interface: Function
Removes all associations from this function (optional operation).

Specified by:
clear in interface Function<Integer,V>
Specified by:
clear in interface Map<Integer,V>
Overrides:
clear in class AbstractInt2ObjectFunction<V>
See Also:
Map.clear()

containsKey

public boolean containsKey(int k)
Description copied from class: AbstractInt2ObjectMap
Checks whether the given value is contained in AbstractInt2ObjectMap.keySet().

Specified by:
containsKey in interface Int2ObjectFunction<V>
Overrides:
containsKey in class AbstractInt2ObjectMap<V>
See Also:
Function.containsKey(Object)

containsValue

public boolean containsValue(Object v)
Description copied from class: AbstractInt2ObjectMap
Checks whether the given value is contained in AbstractInt2ObjectMap.values().

Specified by:
containsValue in interface Map<Integer,V>
Overrides:
containsValue in class AbstractInt2ObjectMap<V>

isEmpty

public boolean isEmpty()
Specified by:
isEmpty in interface Map<Integer,V>
Overrides:
isEmpty in class AbstractInt2ObjectMap<V>

put

public V put(int k,
             V v)
Description copied from interface: Int2ObjectFunction
Adds a pair to the map.

Specified by:
put in interface Int2ObjectFunction<V>
Overrides:
put in class AbstractInt2ObjectFunction<V>
Parameters:
k - the key.
v - the value.
Returns:
the old value, or the default return value if no value was present for the given key.
See Also:
Function.put(Object,Object)

remove

public V remove(int k)
Description copied from interface: Int2ObjectFunction
Removes the mapping with the given key.

Specified by:
remove in interface Int2ObjectFunction<V>
Overrides:
remove in class AbstractInt2ObjectFunction<V>
Returns:
the old value, or the default return value if no value was present for the given key.
See Also:
Function.remove(Object)

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 AbstractInt2ObjectMap.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 Map<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 AbstractInt2ObjectMap.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 Map<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.

Overrides:
clone in class Object
Returns:
a deep copy of this map.


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