Package com.google.common.collect
Interface ClassToInstanceMap<B extends @Nullable java.lang.Object>
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- Type Parameters:
B
- the common supertype that all values will share. When in doubt, just useObject
, or use@Nullable Object
to allow null values.
- All Superinterfaces:
java.util.Map<java.lang.Class<? extends @NonNull B>,B>
- All Known Implementing Classes:
ImmutableClassToInstanceMap
,MutableClassToInstanceMap
@DoNotMock("Use ImmutableClassToInstanceMap or MutableClassToInstanceMap") @GwtCompatible public interface ClassToInstanceMap<B extends @Nullable java.lang.Object> extends java.util.Map<java.lang.Class<? extends @NonNull B>,B>
A map, each entry of which maps a Java raw type to an instance of that type. In addition to implementingMap
, the additional type-safe operationsputInstance(java.lang.Class<T>, T)
andgetInstance(java.lang.Class<T>)
are available.Like any other
Map<Class, Object>
, this map may contain entries for primitive types, and a primitive type and its corresponding wrapper type may map to different values.See the Guava User Guide article on
ClassToInstanceMap
.To map a generic type to an instance of that type, use
TypeToInstanceMap
instead.- Since:
- 2.0
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description <T extends @NonNull B>
TgetInstance(java.lang.Class<T> type)
Returns the value the specified class is mapped to, ornull
if no entry for this class is present.<T extends B>
TputInstance(java.lang.Class<@NonNull T> type, T value)
Maps the specified class to the specified value.
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Method Detail
-
getInstance
@CheckForNull <T extends @NonNull B> T getInstance(java.lang.Class<T> type)
Returns the value the specified class is mapped to, ornull
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.
-
putInstance
@CanIgnoreReturnValue @CheckForNull <T extends B> T putInstance(java.lang.Class<@NonNull T> type, T value)
Maps the specified class to the specified value. Does not associate this value with any of the class's supertypes.- Returns:
- the value previously associated with this class (possibly
null
), ornull
if there was no previous entry.
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