Package com.google.common.collect

Interface ClassToInstanceMap<B extends @Nullable Object>

Type Parameters:

B - the common supertype that all values will share. When in doubt, just use Object, or use @Nullable Object to allow null values.

All Superinterfaces:

Map<Class<? extends @NonNull B>,B>

All Known Implementing Classes:

ImmutableClassToInstanceMap, MutableClassToInstanceMap

@DoNotMock("Use ImmutableClassToInstanceMap or MutableClassToInstanceMap")
@GwtCompatible
public interface ClassToInstanceMap<B extends @Nullable Object>
extends Map<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 implementing Map, the additional type-safe operations putInstance(java.lang.Class<T>, T) and getInstance(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.

Implementations

• ImmutableClassToInstanceMap
• MutableClassToInstanceMap

To map a generic type to an instance of that type, use TypeToInstanceMap instead.

See the Guava User Guide article on ClassToInstanceMap.

Since:

2.0

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Method Summary

Modifier and Type	Method	Description
<T extends @NonNull B> @Nullable T	getInstance(Class<T> type)	Returns the value the specified class is mapped to, or null if no entry for this class is present.
<T extends B> @Nullable T	putInstance(Class<@NonNull T> type, T value)	Maps the specified class to the specified value.

Methods inherited from interface java.util.Map

clear, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, equals, forEach, get, getOrDefault, hashCode, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

Method Detail

getInstance

<T extends @NonNull B> @Nullable T getInstance(Class<T> type)

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.

putInstance

@CanIgnoreReturnValue
<T extends B> @Nullable T putInstance(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), or null if there was no previous entry.