org.ualerts.testing.jpa.HibernatePersistentDataResource.java Source code

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Here is the source code for org.ualerts.testing.jpa.HibernatePersistentDataResource.java

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/*
 * File created on May 13, 2013
 *
 * Copyright 2008-2013 Virginia Polytechnic Institute and State University
 *
 * 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.ualerts.testing.jpa;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

import javax.persistence.EntityManager;

import org.hibernate.Session;
import org.hibernate.jdbc.Work;
import org.hibernate.tool.hbm2ddl.MultipleLinesSqlCommandExtractor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A {@link PersistentDataResource} that utilizes a Hibernate Session
 * obtained from an {@link EntityManager} to gain access to the database.
 *
 * @author ceharris
 */
public class HibernatePersistentDataResource extends PersistentDataResource {

    private static final Logger logger = // CHECKSTYLE:idiomatic
            LoggerFactory.getLogger(HibernatePersistentDataResource.class);

    /**
     * Constructs a new instance.
     * @param entityManagerFactory entity manager factory delegate
     */
    public HibernatePersistentDataResource(EntityManagerFactoryResource entityManagerFactory) {
        super(entityManagerFactory);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void doExecuteSQL(EntityManager entityManager, URL resource) throws Throwable {
        logger.info("processing resource: {}", resource);
        Session session = (Session) entityManager.getDelegate();
        final String[] sqlStatements = loadSQLStatements(resource);
        logger.debug("loaded {} statements", sqlStatements.length);
        session.doWork(new Work() {
            @Override
            public void execute(Connection connection) throws SQLException {
                Statement statement = connection.createStatement();
                int count = 0;
                try {
                    for (int i = 0; i < sqlStatements.length; i++) {
                        logger.debug("executing: {}", sqlStatements[i].replaceAll("\n", ""));
                        statement.execute(sqlStatements[i]);
                        count++;
                    }
                } finally {
                    statement.close();
                    logger.info("executed {} statements", count);
                }
            }
        });
    }

    private String[] loadSQLStatements(URL resource) throws IOException {
        InputStream inputStream = resource.openStream();
        try {
            Reader reader = new InputStreamReader(inputStream);
            MultipleLinesSqlCommandExtractor extractor = new MultipleLinesSqlCommandExtractor();
            return extractor.extractCommands(reader);
        } finally {
            inputStream.close();
        }
    }

}