| /* |
| * 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 static com.google.common.base.Preconditions.checkNotNull; |
| |
| import com.google.common.annotations.GwtIncompatible; |
| import com.google.common.primitives.Primitives; |
| import com.google.errorprone.annotations.CanIgnoreReturnValue; |
| import java.io.Serializable; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.Spliterator; |
| |
| /** |
| * A mutable class-to-instance map backed by an arbitrary user-provided map. See also {@link |
| * ImmutableClassToInstanceMap}. |
| * |
| * <p>See the Guava User Guide article on <a href= |
| * "https://github.com/google/guava/wiki/NewCollectionTypesExplained#classtoinstancemap"> {@code |
| * ClassToInstanceMap}</a>. |
| * |
| * @author Kevin Bourrillion |
| * @since 2.0 |
| */ |
| @GwtIncompatible |
| @SuppressWarnings("serial") // using writeReplace instead of standard serialization |
| public final class MutableClassToInstanceMap<B> extends ForwardingMap<Class<? extends B>, B> |
| implements ClassToInstanceMap<B>, Serializable { |
| |
| /** |
| * Returns a new {@code MutableClassToInstanceMap} instance backed by a {@link HashMap} using the |
| * default initial capacity and load factor. |
| */ |
| public static <B> MutableClassToInstanceMap<B> create() { |
| return new MutableClassToInstanceMap<B>(new HashMap<Class<? extends B>, B>()); |
| } |
| |
| /** |
| * Returns a new {@code MutableClassToInstanceMap} instance backed by a given empty {@code |
| * backingMap}. The caller surrenders control of the backing map, and thus should not allow any |
| * direct references to it to remain accessible. |
| */ |
| public static <B> MutableClassToInstanceMap<B> create(Map<Class<? extends B>, B> backingMap) { |
| return new MutableClassToInstanceMap<B>(backingMap); |
| } |
| |
| private final Map<Class<? extends B>, B> delegate; |
| |
| private MutableClassToInstanceMap(Map<Class<? extends B>, B> delegate) { |
| this.delegate = checkNotNull(delegate); |
| } |
| |
| @Override |
| protected Map<Class<? extends B>, B> delegate() { |
| return delegate; |
| } |
| |
| /** |
| * Wraps the {@code setValue} implementation of an {@code Entry} to enforce the class constraint. |
| */ |
| private static <B> Entry<Class<? extends B>, B> checkedEntry( |
| final Entry<Class<? extends B>, B> entry) { |
| return new ForwardingMapEntry<Class<? extends B>, B>() { |
| @Override |
| protected Entry<Class<? extends B>, B> delegate() { |
| return entry; |
| } |
| |
| @Override |
| public B setValue(B value) { |
| return super.setValue(cast(getKey(), value)); |
| } |
| }; |
| } |
| |
| @Override |
| public Set<Entry<Class<? extends B>, B>> entrySet() { |
| return new ForwardingSet<Entry<Class<? extends B>, B>>() { |
| |
| @Override |
| protected Set<Entry<Class<? extends B>, B>> delegate() { |
| return MutableClassToInstanceMap.this.delegate().entrySet(); |
| } |
| |
| @Override |
| public Spliterator<Entry<Class<? extends B>, B>> spliterator() { |
| return CollectSpliterators.map( |
| delegate().spliterator(), MutableClassToInstanceMap::checkedEntry); |
| } |
| |
| @Override |
| public Iterator<Entry<Class<? extends B>, B>> iterator() { |
| return new TransformedIterator<Entry<Class<? extends B>, B>, Entry<Class<? extends B>, B>>( |
| delegate().iterator()) { |
| @Override |
| Entry<Class<? extends B>, B> transform(Entry<Class<? extends B>, B> from) { |
| return checkedEntry(from); |
| } |
| }; |
| } |
| |
| @Override |
| public Object[] toArray() { |
| return standardToArray(); |
| } |
| |
| @Override |
| public <T> T[] toArray(T[] array) { |
| return standardToArray(array); |
| } |
| }; |
| } |
| |
| @Override |
| @CanIgnoreReturnValue |
| public B put(Class<? extends B> key, B value) { |
| return super.put(key, cast(key, value)); |
| } |
| |
| @Override |
| public void putAll(Map<? extends Class<? extends B>, ? extends B> map) { |
| Map<Class<? extends B>, B> copy = new LinkedHashMap<>(map); |
| for (Entry<? extends Class<? extends B>, B> entry : copy.entrySet()) { |
| cast(entry.getKey(), entry.getValue()); |
| } |
| super.putAll(copy); |
| } |
| |
| @CanIgnoreReturnValue |
| @Override |
| public <T extends B> T putInstance(Class<T> type, T value) { |
| return cast(type, put(type, value)); |
| } |
| |
| @Override |
| public <T extends B> T getInstance(Class<T> type) { |
| return cast(type, get(type)); |
| } |
| |
| @CanIgnoreReturnValue |
| private static <B, T extends B> T cast(Class<T> type, B value) { |
| return Primitives.wrap(type).cast(value); |
| } |
| |
| private Object writeReplace() { |
| return new SerializedForm(delegate()); |
| } |
| |
| /** Serialized form of the map, to avoid serializing the constraint. */ |
| private static final class SerializedForm<B> implements Serializable { |
| private final Map<Class<? extends B>, B> backingMap; |
| |
| SerializedForm(Map<Class<? extends B>, B> backingMap) { |
| this.backingMap = backingMap; |
| } |
| |
| Object readResolve() { |
| return create(backingMap); |
| } |
| |
| private static final long serialVersionUID = 0; |
| } |
| } |