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/*
 * Copyright 2021 ObjectBox Ltd. All rights reserved.
 *
 * 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 io.objectbox.annotation;

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

/**
 * Marks a property as a companion to an @Id property. There can only be one companion property.
 * 
 * By defining an @Id companion property, the entity type uses a special ID encoding scheme involving this property
 * in addition to the ID.
 * 
 * For Time Series IDs, a companion property of type Date or DateNano represents the exact timestamp.
 */
@Retention(RetentionPolicy.CLASS)
@Target(ElementType.FIELD)
public @interface IdCompanion {
}