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Cassandra support for Spring Data

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/*
 * Copyright 2013-2019 the original author or 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
 *
 *   https://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.springframework.data.cassandra.core.mapping;

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;

import org.springframework.data.annotation.Persistent;

/**
 * Annotates a type that represents the identity type of another class whose instances are stored in a table.
 * 
 * If your Cassandra table has multiple primary key columns, then you must define a primary key class, annotate it with
 * this annotation, and use that class as the {@link PrimaryKey} of your entity class!
 *
 * @author Alex Shvid
 * @author Matthew T. Adams
 * @author Mark Paluch
 * @see PrimaryKeyColumn
 */
@Inherited
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.TYPE })
@Persistent
public @interface PrimaryKeyClass {
}