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 /*
  * Copyright (C) 2012 The Guava Authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  * http://www.apache.org/licenses/LICENSE-2.0
  *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.common.reflect;
import  javax.annotation.Nullable;

A map, each entry of which maps a TypeToken to an instance of that type. In addition to implementing Map, the additional type-safe operations putInstance and getInstance are available.

Generally, implementations don't support put and putAll because there is no way to check an object at runtime to be an instance of a TypeToken. Instead, caller should use the type safe putInstance.

Also, if caller suppresses unchecked warnings and passes in an Iterable<String> for type Iterable<Integer>, the map won't be able to detect and throw type error.

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.

Parameters:
<B> the common supertype that all entries must share; often this is simply Object
Author(s):
Ben Yu
Since:
13.0
public interface TypeToInstanceMap<B> extends Map<TypeToken<? extends B>, B>  {

  
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.

getInstance(Foo.class) is equivalent to getInstance(TypeToken.of(Foo.class)).

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

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

putInstance(Foo.class, foo) is equivalent to putInstance(TypeToken.of(Foo.class), foo).

Returns:
the value previously associated with this class (possibly null), or null if there was no previous entry.
  @Nullable
  <T extends B> T putInstance(Class<T> type, @Nullable T value);

  
Returns the value the specified type is mapped to, or null if no entry for this type is present. This will only return a value that was bound to this specific type, not a value that may have been bound to a subtype.
  @Nullable
  <T extends B> T getInstance(TypeToken<T> type);

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

Returns:
the value previously associated with this type (possibly null), or null if there was no previous entry.
  @Nullable
  <T extends B> T putInstance(TypeToken<T> type, @Nullable T value);
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