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/*
* Copyright (C) 2008 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.testing.features;
import com.google.common.collect.testing.Helpers;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.Map;
import java.util.Set;
/**
* Optional features of classes derived from {@code Map}.
*
* <p>This class is GWT compatible.
*
* @author George van den Driessche
*/
// Enum values use constructors with generic varargs.
@SuppressWarnings("unchecked")
public enum MapFeature implements Feature<Map> {
/**
* The map does not throw {@code NullPointerException} on calls such as
* {@code containsKey(null)}, {@code get(null)}, or {@code remove(null)}.
*/
ALLOWS_NULL_QUERIES,
ALLOWS_NULL_KEYS (ALLOWS_NULL_QUERIES),
ALLOWS_NULL_VALUES,
RESTRICTS_KEYS,
RESTRICTS_VALUES,
SUPPORTS_PUT,
SUPPORTS_PUT_ALL,
SUPPORTS_REMOVE,
SUPPORTS_CLEAR,
/**
* Indicates that the constructor or factory method of a map, usually an
* immutable map, throws an {@link IllegalArgumentException} when presented
* with duplicate keys instead of discarding all but one.
*/
REJECTS_DUPLICATES_AT_CREATION,
GENERAL_PURPOSE(
SUPPORTS_PUT,
SUPPORTS_PUT_ALL,
SUPPORTS_REMOVE,
SUPPORTS_CLEAR
),
/** Features supported by maps where only removal is allowed. */
REMOVE_OPERATIONS(
SUPPORTS_REMOVE,
SUPPORTS_CLEAR
);
private final Set<Feature<? super Map>> implied;
MapFeature(Feature<? super Map> ... implied) {
this.implied = Helpers.copyToSet(implied);
}
@Override
public Set<Feature<? super Map>> getImpliedFeatures() {
return implied;
}
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@TesterAnnotation
public @interface Require {
public abstract MapFeature[] value() default {};
public abstract MapFeature[] absent() default {};
}
}
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