/*
 * Copyright (c) 2005-2016 Vincent Vandenschrick. All rights reserved.
 *
 *  This file is part of the Jspresso framework.
 *
 *  Jspresso is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Jspresso 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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with Jspresso.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.jspresso.framework.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.Properties;

/**
 * Jspresso version.
 *
 * @author Vincent Vandenschrick
 */
public final class Build {

  private static final Logger LOG = LoggerFactory.getLogger(Build.class);

  /**
   * {@code UNKNOWN}.
   */
  public static final String UNKNOWN = "UNKNOWN";
  private static final Properties JSPRESSO_PROPERTIES;

  static {
    JSPRESSO_PROPERTIES = new Properties();
    try {
      JSPRESSO_PROPERTIES.load(Build.class
          .getResourceAsStream("/META-INF/jspresso.properties"));
    } catch (IOException ioe) {
      LOG.error("jspresso.properties could not be loaded from the current classloader", ioe);
    }
  }

  private Build() {
    // Private helper constructor.
  }

  /**
   * Retrieves the Jspresso version.
   *
   * @return the Jspresso version.
   */
  public static String getJspressoVersion() {
    return JSPRESSO_PROPERTIES.getProperty("jspresso.version", UNKNOWN);
  }

  /**
   * Displays various information about the framework version.
   *
   * @param args
   *          none supported.
   */
  public static void main(String... args) {
    //noinspection UseOfSystemOutOrSystemErr
    System.out.println("Jspresso version : " + getJspressoVersion());
  }
}