it.unimi.dsi.fastutil.objects
Interface Object2IntMap

All Superinterfaces:
Map
All Known Subinterfaces:
Object2IntSortedMap
All Known Implementing Classes:
AbstractObject2IntMap, AbstractObject2IntSortedMap, Object2IntAVLTreeMap, Object2IntLinkedOpenCustomHashMap, Object2IntLinkedOpenHashMap, Object2IntMaps.SynchronizedMap, Object2IntMaps.UnmodifiableMap, Object2IntOpenCustomHashMap, Object2IntOpenHashMap, Object2IntRBTreeMap, Object2IntSortedMaps.EmptySortedMap, Object2IntSortedMaps.Singleton, Object2IntSortedMaps.SynchronizedSortedMap, Object2IntSortedMaps.UnmodifiableSortedMap

public interface Object2IntMap
extends Map

A type-specific Map; provides some additional methods that use polymorphism to reduce type juggling, and handling of a default return value.

Type-specific versions of get(), put() and remove() cannot rely on null to denote absence of a key. Rather, they return a default return value, which is set to 0 cast to the return type (false for booleans) at creation, but can be changed using the defaultReturnValue() method.

For uniformity reasons, even maps returning objects implement the default return value (of course, in this case the default return value is initialized to null). This very useful for maps containing null keys.

A submap or subset may or may not have an independent default return value (which however must be initialized to the default return value of the originator).

Warning: to fall in line as much as possible with the standard map interface, it is strongly suggested that standard versions of get(), put() and remove() for maps with primitive-type values return null to denote missing keys rather than wrap the default return value in an object (of course, for maps with object keys and values this is not possible, as there is no type-specific version).

See Also:
Map

Nested Class Summary
static interface Object2IntMap.Entry
          A type-specific Map.Entry; provides some additional methods to access its content reducing type juggling.
 
Method Summary
 boolean containsValue(int value)
           
 int defaultReturnValue()
          Gets the default return value.
 void defaultReturnValue(int rv)
          Sets the default return value.
 int getDefRetValue()
          Deprecated. As of fastutil 2.0, replaced by defaultReturnValue().
 int getInt(Object key)
          Returns the value to which the given key is mapped.
 int put(Object key, int value)
          Adds a pair to the map.
 int removeInt(Object key)
          Removes the mapping with the given key.
 void setDefRetValue(int rv)
          Deprecated. As of fastutil 2.0, replaced by defaultReturnValue().
 
Methods inherited from interface java.util.Map
clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, size, values
 

Method Detail

put

public int put(Object key,
               int value)
Adds a pair to the map.

Parameters:
key - the key.
value - the value.
Returns:
the old value, or the default return value if no value was present for the given key.
See Also:
Map.put(Object,Object)

getInt

public int getInt(Object key)
Returns the value to which the given key is mapped.

Parameters:
key - the key.
Returns:
the corresponding value, or the default return value if no value was present for the given key.
See Also:
Map.get(Object)

removeInt

public int removeInt(Object key)
Removes the mapping with the given key.

Parameters:
key -
Returns:
the old value, or the default return value if no value was present for the given key.
See Also:
Map.remove(Object)

containsValue

public boolean containsValue(int value)
See Also:
Map.containsValue(Object)

setDefRetValue

public void setDefRetValue(int rv)
Deprecated. As of fastutil 2.0, replaced by defaultReturnValue().

Parameters:
rv - the new default return value.
See Also:
getDefRetValue(), defaultReturnValue()

getDefRetValue

public int getDefRetValue()
Deprecated. As of fastutil 2.0, replaced by defaultReturnValue().

Returns:
the current default return value.
See Also:
defaultReturnValue()

defaultReturnValue

public void defaultReturnValue(int rv)
Sets the default return value. This value must be returned by type-specific versions of get(), put() and remove() to denote that the map does not contain the specified key. It must be 0/false/null by default.

Parameters:
rv - the new default return value.
See Also:
defaultReturnValue()

defaultReturnValue

public int defaultReturnValue()
Gets the default return value.

Returns:
the current default return value.