84 lines
2.7 KiB
Java
84 lines
2.7 KiB
Java
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/*
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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.HashMap;
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import java.util.Map;
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import com.google.common.collect.MapConstraints.ConstrainedMap;
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import com.google.common.primitives.Primitives;
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/**
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* A mutable class-to-instance map backed by an arbitrary user-provided map. See
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* also {@link ImmutableClassToInstanceMap}.
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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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* @author Kevin Bourrillion
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* @since 2.0 (imported from Google Collections Library)
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*/
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public final class MutableClassToInstanceMap<B> extends ConstrainedMap<Class<? extends B>, B>
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implements ClassToInstanceMap<B> {
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/**
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* Returns a new {@code MutableClassToInstanceMap} instance backed by a
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* {@link HashMap} using the default initial capacity and load factor.
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*/
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public static <B> MutableClassToInstanceMap<B> create() {
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return new MutableClassToInstanceMap<B>(new HashMap<Class<? extends B>, B>());
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}
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/**
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* Returns a new {@code MutableClassToInstanceMap} instance backed by a given
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* empty {@code backingMap}. The caller surrenders control of the backing map,
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* and thus should not allow any direct references to it to remain accessible.
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*/
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public static <B> MutableClassToInstanceMap<B> create(Map<Class<? extends B>, B> backingMap) {
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return new MutableClassToInstanceMap<B>(backingMap);
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}
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private MutableClassToInstanceMap(Map<Class<? extends B>, B> delegate) {
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super(delegate, VALUE_CAN_BE_CAST_TO_KEY);
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}
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private static final MapConstraint<Class<?>, Object> VALUE_CAN_BE_CAST_TO_KEY = new MapConstraint<Class<?>, Object>() {
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@Override
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public void checkKeyValue(Class<?> key, Object value) {
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cast(key, value);
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}
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};
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@Override
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public <T extends B> T putInstance(Class<T> type, T value) {
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return cast(type, put(type, value));
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}
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@Override
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public <T extends B> T getInstance(Class<T> type) {
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return cast(type, get(type));
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}
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private static <B, T extends B> T cast(Class<T> type, B value) {
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return Primitives.wrap(type).cast(value);
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}
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private static final long serialVersionUID = 0;
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}
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