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Data Repository Support for Micronaut

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/*
 * Copyright 2017-2020 original 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 io.micronaut.data.jpa.repository.intercept;

import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.type.ReturnType;
import io.micronaut.data.exceptions.EmptyResultException;
import io.micronaut.data.intercept.RepositoryMethodKey;
import io.micronaut.data.jpa.operations.JpaRepositoryOperations;
import io.micronaut.data.jpa.repository.criteria.Specification;
import io.micronaut.data.operations.RepositoryOperations;

import jakarta.persistence.EntityManager;
import jakarta.persistence.NoResultException;
import jakarta.persistence.TypedQuery;
import jakarta.persistence.criteria.CriteriaBuilder;
import jakarta.persistence.criteria.CriteriaQuery;
import jakarta.persistence.criteria.Predicate;
import jakarta.persistence.criteria.Root;
import java.util.Optional;

/**
 * Implementation of {@code findOne(Specification)} for JPA specifications.
 *
 * @author graemerocher
 * @author Denis Stepanov
 * @since 3.1
 */
@Internal
public class FindOneSpecificationInterceptor extends AbstractSpecificationInterceptor {
    private final JpaRepositoryOperations jpaOperations;

    /**
     * Default constructor.
     *
     * @param operations The operations
     */
    protected FindOneSpecificationInterceptor(@NonNull RepositoryOperations operations) {
        super(operations);
        if (operations instanceof JpaRepositoryOperations jpaRepositoryOperations) {
            this.jpaOperations = jpaRepositoryOperations;
        } else {
            throw new IllegalStateException("Repository operations must be na instance of JpaRepositoryOperations");
        }
    }

    @Override
    public Object intercept(RepositoryMethodKey methodKey, MethodInvocationContext context) {
        Specification specification = getSpecification(context, true);
        final EntityManager entityManager = jpaOperations.getCurrentEntityManager();
        final CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
        final CriteriaQuery