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Spring Data module for JPA repositories.
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/*
 * Copyright 2008-2021 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.jpa.domain;

import java.io.Serializable;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Date;
import java.util.Optional;

import javax.persistence.ManyToOne;
import javax.persistence.MappedSuperclass;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

import org.springframework.data.domain.Auditable;
import org.springframework.lang.Nullable;

/**
 * Abstract base class for auditable entities. Stores the audition values in persistent fields.
 *
 * @author Oliver Gierke
 * @author Christoph Strobl
 * @author Mark Paluch
 * @param  the auditing type. Typically some kind of user.
 * @param  the type of the auditing type's identifier.
 */
@MappedSuperclass
public abstract class AbstractAuditable extends AbstractPersistable
		implements Auditable {

	private static final long serialVersionUID = 141481953116476081L;

	@ManyToOne //
	private @Nullable U createdBy;

	@Temporal(TemporalType.TIMESTAMP) //
	private @Nullable Date createdDate;

	@ManyToOne //
	private @Nullable U lastModifiedBy;

	@Temporal(TemporalType.TIMESTAMP) //
	private @Nullable Date lastModifiedDate;

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.domain.Auditable#getCreatedBy()
	 */
	@Override
	public Optional getCreatedBy() {
		return Optional.ofNullable(createdBy);
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.domain.Auditable#setCreatedBy(java.lang.Object)
	 */
	@Override
	public void setCreatedBy(U createdBy) {
		this.createdBy = createdBy;
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.domain.Auditable#getCreatedDate()
	 */
	@Override
	public Optional getCreatedDate() {
		return null == createdDate ? Optional.empty()
				: Optional.of(LocalDateTime.ofInstant(createdDate.toInstant(), ZoneId.systemDefault()));
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.domain.Auditable#setCreatedDate(java.time.temporal.TemporalAccessor)
	 */
	@Override
	public void setCreatedDate(LocalDateTime createdDate) {
		this.createdDate = Date.from(createdDate.atZone(ZoneId.systemDefault()).toInstant());
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.domain.Auditable#getLastModifiedBy()
	 */
	@Override
	public Optional getLastModifiedBy() {
		return Optional.ofNullable(lastModifiedBy);
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.domain.Auditable#setLastModifiedBy(java.lang.Object)
	 */
	@Override
	public void setLastModifiedBy(U lastModifiedBy) {
		this.lastModifiedBy = lastModifiedBy;
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.domain.Auditable#getLastModifiedDate()
	 */
	@Override
	public Optional getLastModifiedDate() {
		return null == lastModifiedDate ? Optional.empty()
				: Optional.of(LocalDateTime.ofInstant(lastModifiedDate.toInstant(), ZoneId.systemDefault()));
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.domain.Auditable#setLastModifiedDate(java.time.temporal.TemporalAccessor)
	 */
	@Override
	public void setLastModifiedDate(LocalDateTime lastModifiedDate) {
		this.lastModifiedDate = Date.from(lastModifiedDate.atZone(ZoneId.systemDefault()).toInstant());
	}
}