69 lines
2.4 KiB
Java
69 lines
2.4 KiB
Java
/*
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* Copyright (C) 2007 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.collect;
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import java.util.Map;
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import javax.annotation.Nullable;
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import com.google.common.annotations.GwtCompatible;
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/**
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* A map, each entry of which maps a Java
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* <a href="http://tinyurl.com/2cmwkz">raw type</a> to an instance of that type.
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* In addition to implementing {@code Map}, the additional type-safe operations
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* {@link #putInstance} and {@link #getInstance} are available.
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*
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* <p>
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* Like any other {@code Map<Class, Object>}, this map may contain entries for
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* primitive types, and a primitive type and its corresponding wrapper type may
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* map to different values.
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*
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* <p>
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* See the Guava User Guide article on <a href=
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* "http://code.google.com/p/guava-libraries/wiki/NewCollectionTypesExplained#ClassToInstanceMap">
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* {@code ClassToInstanceMap}</a>.
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*
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* <p>
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* To map a generic type to an instance of that type, use
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* {@link com.google.common.reflect.TypeToInstanceMap} instead.
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*
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* @param <B> the common supertype that all entries must share; often this is
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* simply {@link Object}
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*
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* @author Kevin Bourrillion
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* @since 2.0 (imported from Google Collections Library)
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*/
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@GwtCompatible
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public interface ClassToInstanceMap<B> extends Map<Class<? extends B>, B> {
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/**
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* Returns the value the specified class is mapped to, or {@code null} if no
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* entry for this class is present. This will only return a value that was bound
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* to this specific class, not a value that may have been bound to a subtype.
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*/
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<T extends B> T getInstance(Class<T> type);
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/**
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* Maps the specified class to the specified value. Does <i>not</i> associate
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* this value with any of the class's supertypes.
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*
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* @return the value previously associated with this class (possibly {@code
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* null}), or {@code null} if there was no previous entry.
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*/
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<T extends B> T putInstance(Class<T> type, @Nullable T value);
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}
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