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/*
 * Copyright (C) 2007 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.collect;

import com.google.common.annotations.GwtCompatible;

import java.util.Map;

import javax.annotation.Nullable;

/**
 * A map, each entry of which maps a Java
 * raw type to an instance of that type.
 * In addition to implementing {@code Map}, the additional type-safe operations
 * {@link #putInstance} and {@link #getInstance} are available.
 *
 * 

Like any other {@code Map}, 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 * {@code ClassToInstanceMap}. * *

To map a generic type to an instance of that type, use {@link * com.google.common.reflect.TypeToInstanceMap} instead. * * @param the common supertype that all entries must share; often this is * simply {@link Object} * * @author Kevin Bourrillion * @since 2.0 (imported from Google Collections Library) */ @GwtCompatible public interface ClassToInstanceMap extends Map, B> { /** * Returns the value the specified class is mapped to, or {@code 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. */ T getInstance(Class type); /** * Maps the specified class to the specified value. Does not associate * this value with any of the class's supertypes. * * @return the value previously associated with this class (possibly {@code * null}), or {@code null} if there was no previous entry. */ T putInstance(Class type, @Nullable T value); }