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The BSON library

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/*
 * Copyright 2008-present MongoDB, 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.bson.codecs.pojo.annotations;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * An annotation that configures the discriminator key and value for a class.
 *
 * For POJOs, requires the {@link org.bson.codecs.pojo.Conventions#ANNOTATION_CONVENTION}
 * For Java records, the annotation is not supported.
 *
 * @since 3.5
 * @see org.bson.codecs.pojo.Conventions#ANNOTATION_CONVENTION
 */
@Inherited
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface BsonDiscriminator {

    /**
     * @return the discriminator value to use for this type.
     */
    String value() default "";

    /**
     * @return the discriminator key to use for this type.
     */
    String key() default "_t";
}