de.bstreit.java.oscr.initialdata.LoadInitialDataApp.java Source code

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Here is the source code for de.bstreit.java.oscr.initialdata.LoadInitialDataApp.java

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/*
 * Open Source Cash Register
 * 
 * Copyright (C) 2013, 2014 Bernhard Streit
 * 
 * This file is part of the Open Source Cash Register program.
 * 
 * Open Source Cash Register is free software: you can redistribute it 
 * and/or modify it under the terms of the GNU General Public License 
 * as published by the Free Software Foundation, either version 3 of 
 * the License, or (at your option) any later version.
 * 
 * Open Source Cash Register is distributed in the hope that it will 
 * be useful, but WITHOUT ANY WARRANTY; without even the implied 
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
 * See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *  
 * --------------------------------------------------------------------------
 *  
 * See oscr/licenses/gpl-3.txt for a copy of the GNU GPL.
 * See oscr/README.txt for more information about the software and the author(s).
 * 
 */
package de.bstreit.java.oscr.initialdata;

import java.sql.SQLException;
import java.util.InputMismatchException;
import java.util.Scanner;

import javax.inject.Inject;
import javax.inject.Named;
import javax.sql.DataSource;

import org.springframework.beans.BeansException;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.orm.jpa.vendor.Database;

import de.bstreit.java.oscr.SpringConfigurationDoesComponentScan;

/**
 * Load initial data. Throw exception and exit if database already exists and is
 * not empty.
 * 
 * @author streit
 */
@Named
public class LoadInitialDataApp {

    static {
    }

    @Inject
    private Database database;
    @Inject
    private DataSource dataSource;

    @Inject
    private DataLoader dataLoader;

    public static void main(String[] args) throws BeansException, SQLException {
        System.out.println("Loading...");

        try (final AbstractApplicationContext context = new AnnotationConfigApplicationContext(
                SpringConfigurationDoesComponentScan.class)) {

            context.getBean(LoadInitialDataApp.class).start();

        } catch (RuntimeException e) {
            if (!"Aborted".equals(e.getMessage())) {
                throw e;
            }
        }
    }

    private void start() throws SQLException {
        allowUserToAbort();

        dataLoader.populateDatabase();

        System.out.println("Done.");

    }

    private void allowUserToAbort() throws SQLException {
        printQuestion();
        askUserForAbort();
    }

    private void printQuestion() throws SQLException {
        System.out.println("");
        System.out.println(
                "Going to fill database " + database + " - " + dataSource.getConnection().getMetaData().toString());
        System.out.println("");
        System.out.println("Continue? [Y/N]");
        System.out.println("");
        System.out.print("> ");
    }

    private void askUserForAbort() {
        String choice;

        try (final Scanner scanner = new Scanner(System.in)) {

            while (true) {
                choice = readFromPrompt(scanner);

                if (choice == null) {
                    continue;
                }

                if (choice.toUpperCase().equals("Y")) {
                    return;
                }

                throw new RuntimeException("Aborted");

            }

        }

    }

    private String readFromPrompt(final Scanner scanner) {

        try {
            return String.valueOf(scanner.next("\\w"));

        } catch (InputMismatchException e) {

            return "";
        }

    }

}