org.syphr.mythtv.api.Database Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of libmythtv-api Show documentation

This library provides a high-level abstract Java API to the MythTV ecosystem.

The newest version!

/*
 * Copyright 2011-2012 Gregory P. Moyer
 *
 * 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.syphr.mythtv.api;

import java.io.IOException;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;

import org.syphr.mythtv.db.DatabaseException;
import org.syphr.mythtv.db.DbUtils;
import org.syphr.mythtv.db.SchemaVersion;

public class Database
{
    private final SchemaVersion version;

    private EntityManagerFactory factory;

    public Database(SchemaVersion version)
    {
        this.version = version;
    }

    public void load() throws DatabaseException, IOException
    {
        factory = DbUtils.getEntityManagerFactory(version);
    }

    public void load(String host,
                     int port,
                     String database,
                     String user,
                     String password) throws DatabaseException
    {
        factory = DbUtils.getEntityManagerFactory(version,
                                                  host,
                                                  port,
                                                  database,
                                                  user,
                                                  password);
    }

    public boolean isLoaded()
    {
        return factory != null && factory.isOpen();
    }

    public EntityManager getEntityManager() throws IllegalStateException
    {
        if (!isLoaded())
        {
            throw new IllegalStateException("database not loaded");
        }

        return factory.createEntityManager();
    }
}