JpaPersistableEntityInformation.java

/*
 * Copyright 2011-2017 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
 *
 *      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.springframework.data.jpa.repository.support;

import java.util.Optional;

import javax.persistence.metamodel.Metamodel;

import org.springframework.data.domain.Persistable;

/**
 * Extension of {@link JpaMetamodelEntityInformation} that consideres methods of {@link Persistable} to lookup the id.
 * 
 * @author Oliver Gierke
 * @author Christoph Strobl
 */
public class JpaPersistableEntityInformation<T extends Persistable<ID>, ID>
		extends JpaMetamodelEntityInformation<T, ID> {

	/**
	 * Creates a new {@link JpaPersistableEntityInformation} for the given domain class and {@link Metamodel}.
	 * 
	 * @param domainClass must not be {@literal null}.
	 * @param metamodel must not be {@literal null}.
	 */
	public JpaPersistableEntityInformation(Class<T> domainClass, Metamodel metamodel) {
		super(domainClass, metamodel);
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation#isNew(java.lang.Object)
	 */
	@Override
	public boolean isNew(T entity) {
		return entity.isNew();
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation#getId(java.lang.Object)
	 */
	@Override
	public Optional<ID> getId(T entity) {
		return Optional.ofNullable(entity.getId());
	}
}