FilteredCRUDService2Impl.java

/*
 * Copyright 2023 Global Crop Diversity Trust
 *
 * 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.gringlobal.service.impl;

import java.util.LinkedList;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

import org.genesys.blocks.model.EmptyModel;
import org.genesys.blocks.model.filters.EmptyModelFilter;
import org.gringlobal.api.MultiOp;
import org.gringlobal.api.exception.InvalidApiUsageException;
import org.gringlobal.custom.elasticsearch.SearchException;
import org.gringlobal.service.CRUDService2;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.querydsl.QuerydslPredicateExecutor;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.validation.annotation.Validated;

/**
 * The basic FilteredCRUDServiceImpl.
 *
 * @param <E> the model type
 * @param <F> the model filter type
 * @param <R> the repository type
 */
@Transactional(readOnly = true)
@Validated
public abstract class FilteredCRUDService2Impl<E extends EmptyModel, F extends EmptyModelFilter<F, E, ?>, R extends JpaRepository<E, Long> & QuerydslPredicateExecutor<E>> extends
	FilteredCRUDServiceImpl<E, F, R> implements CRUDService2<E> {

	@Override
	public Page<E> list(F filter, Pageable page) throws SearchException {
		return super.list(adjustFilter(filter), page);
	}

	/**
	 * Adjust filter lets us add additional constraints
	 * @param filter the original filter
	 * @return adjusted filter
	 */
	protected F adjustFilter(F filter) {
		return filter;
	}

	@Override
	public final List<E> get(List<E> list) {
		// result must maintain order of items in list
		var sourceIds = list.stream().map(EmptyModel::getId).filter(Objects::nonNull).collect(Collectors.toList());
		var res = repository.findAllById(sourceIds);
		res.sort((a, b) -> {
			return Integer.compare(sourceIds.indexOf(a.getId()), sourceIds.indexOf(b.getId()));
		});
		return res;
	}

	@Override
	@Transactional
	public E createFast(E source) {
		if (! source.isNew()) throw new InvalidApiUsageException("id must be null for a new record");
		return repository.save(source);
	}

	@Override
	@Transactional
	public E updateFast(E updated) {
		entityManager.detach(updated); // Ensure that EM does not reuse incoming entity
		E target = get(updated);
		return updateFast(updated, target);
	}

}