com.google.common.collect

Interface ClassToInstanceMap<B>

Type Parameters:

B - the common supertype that all entries must share; often this is simply Object

All Superinterfaces:

Map<Class<? extends B>,B>

All Known Implementing Classes:

ImmutableClassToInstanceMap, MutableClassToInstanceMap

@GwtCompatible
public interface ClassToInstanceMap<B>
extends Map<Class<? extends 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.

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 (imported from Google Collections Library)

Author:

Kevin Bourrillion

Nested Class Summary

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

Map.Entry<K,V>

Method Summary

Methods

Modifier and Type	Method and Description
<T extends B> 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> T	putInstance(Class<T> type, T value) Maps the specified class to the specified value.

Methods inherited from interface java.util.Map

clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, size, values

Method Detail

getInstance

<T extends B> 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

<T extends B> T putInstance(Class<T> type,
                          @Nullable
                          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.