com.google.guava4pingcap.reflect.TypeToInstanceMap Maven / Gradle / Ivy
/*
* 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.guava4pingcap.reflect;
import com.google.guava4pingcap.annotations.Beta;
import java.util.Map;
import javax.annotation.Nullable;
/**
* A map, each entry of which maps a {@link TypeToken} to an instance of that type.
* In addition to implementing {@code Map}, the additional type-safe operations
* {@link #putInstance} and {@link #getInstance} are available.
*
* Generally, implementations don't support {@link #put} and {@link #putAll}
* because there is no way to check an object at runtime to be an instance of a
* {@link TypeToken}. Instead, caller should use the type safe {@link #putInstance}.
*
*
Also, if caller suppresses unchecked warnings and passes in an {@code Iterable}
* for type {@code Iterable}, the map won't be able to detect and throw type error.
*
* 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.
*
* @param the common supertype that all entries must share; often this is
* simply {@link Object}
*
* @author Ben Yu
* @since 13.0
*/
@Beta
public interface TypeToInstanceMap 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.
*
* {@code getInstance(Foo.class)} is equivalent to
* {@code getInstance(TypeToken.of(Foo.class))}.
*/
@Nullable
T getInstance(Class type);
/**
* Maps the specified class to the specified value. Does not associate
* this value with any of the class's supertypes.
*
* {@code putInstance(Foo.class, foo)} is equivalent to
* {@code putInstance(TypeToken.of(Foo.class), foo)}.
*
* @return the value previously associated with this class (possibly {@code null}),
* or {@code null} if there was no previous entry.
*/
@Nullable
T putInstance(Class type, @Nullable T value);
/**
* Returns the value the specified type is mapped to, or {@code null} if no
* entry for this type is present. This will only return a value that was
* bound to this specific type, not a value that may have been bound to a subtype.
*/
@Nullable
T getInstance(TypeToken type);
/**
* Maps the specified type to the specified value. Does not associate
* this value with any of the type's supertypes.
*
* @return the value previously associated with this type (possibly {@code null}),
* or {@code null} if there was no previous entry.
*/
@Nullable
T putInstance(TypeToken type, @Nullable T value);
}