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/*
 * 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 jersey.repackaged.com.google.common.collect;

import jersey.repackaged.com.google.common.annotations.Beta;
import jersey.repackaged.com.google.common.annotations.GwtCompatible;

import javax.annotation.Nullable;

/**
 * A constraint on the keys and values that may be added to a {@code Map} or
 * {@code Multimap}. For example, {@link MapConstraints#notNull()}, which
 * prevents a map from including any null keys or values, could be implemented
 * like this: 
   {@code
 *
 *   public void checkKeyValue(Object key, Object value) {
 *     if (key == null || value == null) {
 *       throw new NullPointerException();
 *     }
 *   }}
* *

In order to be effective, constraints should be deterministic; that is, they * should not depend on state that can change (such as external state, random * variables, and time) and should only depend on the value of the passed-in key * and value. A non-deterministic constraint cannot reliably enforce that all * the collection's elements meet the constraint, since the constraint is only * enforced when elements are added. * * @author Mike Bostock * @see MapConstraints * @see Constraint * @since 3.0 */ @GwtCompatible @Beta public interface MapConstraint { /** * Throws a suitable {@code RuntimeException} if the specified key or value is * illegal. Typically this is either a {@link NullPointerException}, an * {@link IllegalArgumentException}, or a {@link ClassCastException}, though * an application-specific exception class may be used if appropriate. */ void checkKeyValue(@Nullable K key, @Nullable V value); /** * Returns a brief human readable description of this constraint, such as * "Not null". */ @Override String toString(); }





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