/* * 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 com.google.common.annotations.Beta; import java.util.Map; import javax.annotation.Nullable; /** * A map, each entry of which maps a {@link TypeToken} to an instance of that type. * In addition to implementing {@code Map}, the additional type-safe operations * {@link #putInstance} and {@link #getInstance} are available. * *
Generally, implementations don't support {@link #put} and {@link #putAll} * because there is no way to check an object at runtime to be an instance of a * {@link TypeToken}. Instead, caller should use the type safe {@link #putInstance}. * *
Also, if caller suppresses unchecked warnings and passes in an {@code Iterable Like any other {@code Map {@code getInstance(Foo.class)} is equivalent to
* {@code getInstance(TypeToken.of(Foo.class))}.
*/
@Nullable
{@code putInstance(Foo.class, foo)} is equivalent to
* {@code putInstance(TypeToken.of(Foo.class), foo)}.
*
* @return the value previously associated with this class (possibly {@code null}),
* or {@code null} if there was no previous entry.
*/
@Nullable