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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.runtime.intercept;

import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.core.convert.ConversionService;
import io.micronaut.core.type.ReturnType;
import io.micronaut.data.exceptions.EmptyResultException;
import io.micronaut.data.intercept.FindOneInterceptor;
import io.micronaut.data.intercept.RepositoryMethodKey;
import io.micronaut.data.operations.RepositoryOperations;

import edu.umd.cs.findbugs.annotations.NonNull;
import io.micronaut.data.model.runtime.PreparedQuery;

/**
 * Default implementation of the {@link FindOneInterceptor} interface.
 *
 * @param  The declaring type.
 */
public class DefaultFindOneInterceptor extends AbstractQueryInterceptor implements FindOneInterceptor {

    /**
     * The default constructor.
     * @param datastore The operations
     */
    protected DefaultFindOneInterceptor(@NonNull RepositoryOperations datastore) {
        super(datastore);
    }

    @Override
    public Object intercept(RepositoryMethodKey methodKey, MethodInvocationContext context) {
        PreparedQuery preparedQuery = prepareQuery(methodKey, context, null);
        Object result = operations.findOne(preparedQuery);

        if (result != null) {
            ReturnType