core/src/main/java/org/elasticsearch/common/inject/internal/Nullable.java


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/*
 * Copyright (C) 2007 Google Inc.
 *
 * 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 org.elasticsearch.common.inject.internal;

import java.lang.annotation.*;

/**
 * The presence of this annotation on a method parameter indicates that
 * {@code null} is an acceptable value for that parameter.  It should not be
 * used for parameters of primitive types.
 * <p>
 * This annotation may be used with the Google Web Toolkit (GWT).
 *
 * @author Kevin Bourrillion
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.PARAMETER, ElementType.FIELD})
public @interface Nullable {
}