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

Author:

Kevin Bourrillion

Nested Class Summary

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

Map.Entry<K,V>

Method Summary

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, 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

@CanIgnoreReturnValue
<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

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