com.google.common.collect
Class MutableClassToInstanceMap<B>

java.lang.Object
  com.google.common.collect.ForwardingObject
      com.google.common.collect.ForwardingMap<K,V>
          com.google.common.collect.MutableClassToInstanceMap<B>

All Implemented Interfaces:

ClassToInstanceMap<B>, Map<Class<? extends B>,B>

public final class MutableClassToInstanceMap<B>
extends ForwardingMap<K,V>
implements ClassToInstanceMap<B>

A mutable class-to-instance map backed by an arbitrary user-provided map. See also ImmutableClassToInstanceMap.

Since:

2 (imported from Google Collections Library)

Author:

Kevin Bourrillion

create

public static <B> MutableClassToInstanceMap<B> create()

Returns a new MutableClassToInstanceMap instance backed by a HashMap using the default initial capacity and load factor.

create

public static <B> MutableClassToInstanceMap<B> create(Map<Class<? extends B>,B> backingMap)

Returns a new MutableClassToInstanceMap instance backed by a given empty backingMap. The caller surrenders control of the backing map, and thus should not allow any direct references to it to remain accessible.

putInstance

public <T extends B> T putInstance(Class<T> type,
                                   T value)

Description copied from interface: ClassToInstanceMap

Maps the specified class to the specified value. Does not associate this value with any of the class's supertypes.

Specified by:

putInstance in interface ClassToInstanceMap<B>

Returns:

the value previously associated with this class (possibly null), or null if there was no previous entry.

getInstance

public <T extends B> T getInstance(Class<T> type)

Description copied from interface: ClassToInstanceMap

Returns the value the specified class is mapped to, or null if no entry for this class is present. This will only return a value that was bound to this specific class, not a value that may have been bound to a subtype.

Specified by:

getInstance in interface ClassToInstanceMap<B>

delegate

protected Map<K,V> delegate()

Description copied from class: ForwardingObject

Returns the backing delegate instance that methods are forwarded to. Abstract subclasses generally override this method with an abstract method that has a more specific return type, such as ForwardingSet.delegate(). Concrete subclasses override this method to supply the instance being decorated.

Specified by:

delegate in class ForwardingMap<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Description copied from interface: java.util.Map

Returns a Set view of the mappings contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation, or through the setValue operation on a map entry returned by the iterator) the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.

Specified by:

entrySet in interface Map<K,V>

Overrides:

entrySet in class ForwardingMap<K,V>

Returns:

a set view of the mappings contained in this map

put

public V put(K key,
             V value)

Description copied from interface: java.util.Map

Associates the specified value with the specified key in this map (optional operation). If the map previously contained a mapping for the key, the old value is replaced by the specified value. (A map m is said to contain a mapping for a key k if and only if m.containsKey(k) would return true.)

Specified by:

put in interface Map<K,V>

Overrides:

put in class ForwardingMap<K,V>

Parameters:

key - key with which the specified value is to be associated

value - value to be associated with the specified key

Returns:

the previous value associated with key, or null if there was no mapping for key. (A null return can also indicate that the map previously associated null with key, if the implementation supports null values.)

putAll

public void putAll(Map<? extends K,? extends V> map)

Description copied from interface: java.util.Map

Copies all of the mappings from the specified map to this map (optional operation). The effect of this call is equivalent to that of calling put(k, v) on this map once for each mapping from key k to value v in the specified map. The behavior of this operation is undefined if the specified map is modified while the operation is in progress.

Specified by:

putAll in interface Map<K,V>

Overrides:

putAll in class ForwardingMap<K,V>

Parameters:

map - mappings to be stored in this map