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Spring Data support for YugabyteDB YSQL.
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/*
 * Copyright (c) Yugabyte, Inc.
 * 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 com.yugabyte.data.jdbc.repository.support;

import java.lang.reflect.Method;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.data.jdbc.core.convert.EntityRowMapper;
import org.springframework.data.jdbc.core.convert.JdbcConverter;
import org.springframework.data.jdbc.repository.QueryMappingConfiguration;
import org.springframework.data.jdbc.repository.query.JdbcQueryMethod;
import org.springframework.data.jdbc.repository.query.PartTreeJdbcQuery;
import org.springframework.data.jdbc.repository.query.StringBasedJdbcQuery;
import org.springframework.data.mapping.callback.EntityCallbacks;
import org.springframework.data.projection.ProjectionFactory;
import org.springframework.data.relational.core.dialect.Dialect;
import org.springframework.data.relational.core.mapping.RelationalMappingContext;
import org.springframework.data.relational.core.mapping.RelationalPersistentEntity;
import org.springframework.data.relational.core.mapping.event.AfterLoadCallback;
import org.springframework.data.relational.core.mapping.event.AfterLoadEvent;
import org.springframework.data.repository.core.NamedQueries;
import org.springframework.data.repository.core.RepositoryMetadata;
import org.springframework.data.repository.query.QueryCreationException;
import org.springframework.data.repository.query.QueryLookupStrategy;
import org.springframework.data.repository.query.RepositoryQuery;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.SingleColumnRowMapper;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcOperations;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;

/**
 * {@link QueryLookupStrategy} for YugabyteDB repositories.
 *
 * @author Nikhil Chandrappa
 */
public class YsqlQueryLookupStrategy implements QueryLookupStrategy {

	private final ApplicationEventPublisher publisher;
	private final @Nullable EntityCallbacks callbacks;
	private final RelationalMappingContext context;
	private final JdbcConverter converter;
	private final Dialect dialect;
	private final QueryMappingConfiguration queryMappingConfiguration;
	private final NamedParameterJdbcOperations operations;
	private final BeanFactory beanfactory;

	YsqlQueryLookupStrategy(ApplicationEventPublisher publisher, @Nullable EntityCallbacks callbacks,
			RelationalMappingContext context, JdbcConverter converter, Dialect dialect,
			QueryMappingConfiguration queryMappingConfiguration, NamedParameterJdbcOperations operations,
			BeanFactory beanfactory) {

		Assert.notNull(publisher, "ApplicationEventPublisher must not be null");
		Assert.notNull(context, "RelationalMappingContextPublisher must not be null");
		Assert.notNull(converter, "JdbcConverter must not be null");
		Assert.notNull(dialect, "Dialect must not be null");
		Assert.notNull(queryMappingConfiguration, "QueryMappingConfiguration must not be null");
		Assert.notNull(operations, "NamedParameterJdbcOperations must not be null");

		this.publisher = publisher;
		this.callbacks = callbacks;
		this.context = context;
		this.converter = converter;
		this.dialect = dialect;
		this.queryMappingConfiguration = queryMappingConfiguration;
		this.operations = operations;
		this.beanfactory = beanfactory;
	}

	@Override
	public RepositoryQuery resolveQuery(Method method, RepositoryMetadata repositoryMetadata,
			ProjectionFactory projectionFactory, NamedQueries namedQueries) {

		JdbcQueryMethod queryMethod = new JdbcQueryMethod(method, repositoryMetadata, projectionFactory, namedQueries,
				context);

		try {
			if (namedQueries.hasQuery(queryMethod.getNamedQueryName()) || queryMethod.hasAnnotatedQuery()) {

				RowMapper mapper = queryMethod.isModifyingQuery() ? null : createMapper(queryMethod);
				StringBasedJdbcQuery query = new StringBasedJdbcQuery(queryMethod, operations, mapper, converter);
				query.setBeanFactory(beanfactory);
				return query;
			} else {
				return new PartTreeJdbcQuery(context, queryMethod, dialect, converter, operations,
						createMapper(queryMethod));
			}
		} catch (Exception e) {
			throw QueryCreationException.create(queryMethod, e);
		}
	}

	@SuppressWarnings("unchecked")
	private RowMapper