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/*
* 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 com.google.common.collect.ForwardingMap;
import com.google.common.collect.Maps;
import java.util.Map;
import javax.annotation.Nullable;
/**
* A mutable type-to-instance map.
* See also {@link ImmutableTypeToInstanceMap}.
*
* @author Ben Yu
* @since 13.0
*/
@Beta
public final class MutableTypeToInstanceMap<B> extends ForwardingMap<TypeToken<? extends B>, B>
implements TypeToInstanceMap<B> {
private final Map<TypeToken<? extends B>, B> backingMap = Maps.newHashMap();
@Nullable
@Override
public <T extends B> T getInstance(Class<T> type) {
return trustedGet(TypeToken.of(type));
}
@Nullable
@Override
public <T extends B> T putInstance(Class<T> type, @Nullable T value) {
return trustedPut(TypeToken.of(type), value);
}
@Nullable
@Override
public <T extends B> T getInstance(TypeToken<T> type) {
return trustedGet(type.rejectTypeVariables());
}
@Nullable
@Override
public <T extends B> T putInstance(TypeToken<T> type, @Nullable T value) {
return trustedPut(type.rejectTypeVariables(), value);
}
/** Not supported. Use {@link #putInstance} instead. */
@Override public B put(TypeToken<? extends B> key, B value) {
throw new UnsupportedOperationException("Please use putInstance() instead.");
}
/** Not supported. Use {@link #putInstance} instead. */
@Override public void putAll(Map<? extends TypeToken<? extends B>, ? extends B> map) {
throw new UnsupportedOperationException("Please use putInstance() instead.");
}
@Override protected Map<TypeToken<? extends B>, B> delegate() {
return backingMap;
}
@SuppressWarnings("unchecked") // value could not get in if not a T
@Nullable
private <T extends B> T trustedPut(TypeToken<T> type, @Nullable T value) {
return (T) backingMap.put(type, value);
}
@SuppressWarnings("unchecked") // value could not get in if not a T
@Nullable
private <T extends B> T trustedGet(TypeToken<T> type) {
return (T) backingMap.get(type);
}
}
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