/*
 * Copyright 2005 the original author or 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
 * 
 *      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.wamblee.support.persistence;


/**
 * This class is used for starting the database from ant.
 */
public class DatabaseStarter {

    /**
     * Database class which encapsulates management of the database.
     */
    private Class _databaseClass;

    /**
     * Execution as a main program. Commandline
     * 
     * <pre>
     * 
     *    DatabaseStarter &lt;databaseClassName&gt;
     *  
     * </pre>
     * 
     * where the database class name must be the name of a concrete subclass of
     * {@link Database}.
     * 
     * @param args
     */
    public static void main( String[] args ) throws Exception {
        String clazz = args[0];
        try {
            new DatabaseStarter( Class.forName( clazz ) ).start( );
        } catch ( Exception e ) {
            e.printStackTrace( );
            System.out
                    .println( "\nUsage: ant dbClass ");
        }
    }

    /**
     * Constructs the database starter.
     * 
     * @param aClassName
     *            Classname of the database class to use.
     * @throws Exception
     */
    public DatabaseStarter( Class aClass ) throws Exception {
        if ( !Database.class.isAssignableFrom( aClass ) ) {
            throw new IllegalArgumentException( "Class '"
                    + aClass.getName( )
                    + "' is not a subclass of Database" );
        }
        _databaseClass = aClass;
    }

    /**
     * Constructs a database starter with the derby database.
     * 
     * @throws Exception
     */
    public DatabaseStarter( ) throws Exception {
        this( DerbyDatabase.class );
    }

    /**
     * Starts the database.
     * 
     * @throws Exception
     */
    public void start( ) throws Exception {
        Database lDatabase = (Database) _databaseClass.newInstance( );
        lDatabase.start( );
        System.out.println( "Database has been started. " );
        System.out.println( );
        System.out.println("=======================================================");
        System.out.println( "Connection details:" );
       // System.out.println( "  Driver class: "
       //         + lDatabase.getDriverClassName( ) );
        System.out.println( "  JDBC URL:     "
                + lDatabase.getExternalJdbcUrl( ) );
        System.out.println( "  username:     '" + lDatabase.getUsername( )
                + "'" );
        System.out.println( "  password:     '" + lDatabase.getPassword( )
                + "'" );
        System.out.println( "Interrupt the program to stop the database." );
        System.out.println("=======================================================");
        System.out.println("You must now populate the database with a schema. Use 'ant help' for information.");
        for ( ;; ) {
            Thread.sleep( 1000 );
        }
    }
}