src/main/java/io/mifos/core/data/jpa/core/MigrationHelper.java

/*
 * Copyright 2017 The Mifos Initiative.
 *
 * 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 io.mifos.core.data.jpa.core;

import liquibase.Contexts;
import liquibase.LabelExpression;
import liquibase.Liquibase;
import liquibase.changelog.ChangeSet;
import liquibase.database.Database;
import liquibase.database.DatabaseFactory;
import liquibase.database.jvm.JdbcConnection;
import liquibase.resource.ClassLoaderResourceAccessor;
import org.springframework.stereotype.Component;

import javax.sql.DataSource;
import java.util.Optional;

@Component
public class MigrationHelper {

  private MigrationHelper() {
    super();
  }

  public static String execute(final DataSource dataSource, final String changeLogFile) throws Exception {
    final JdbcConnection jdbcConnection = new JdbcConnection(dataSource.getConnection());
    final Database database = DatabaseFactory.getInstance().findCorrectDatabaseImplementation(jdbcConnection);
    final Liquibase liquibase =
        new Liquibase(changeLogFile, new ClassLoaderResourceAccessor(), database);
    liquibase.update(new Contexts(), new LabelExpression());

    final Optional<ChangeSet> optionalMaxChangeSet =
        liquibase.getDatabaseChangeLog().getChangeSets()
            .stream()
            .max(VersionComparator::compare);

    return optionalMaxChangeSet.orElseThrow(() -> new IllegalStateException("No valid version found!")).getId();
  }
}