package models;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Properties;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class Version {

	private static String version = null;

	public static String getVersion() {
		// Maven writes a version number derived from the current timestamp
		// to MANIFEST.MF - read it
		if (version == null) {
			JarFile jf = null;
			try {
		        String classPath = Version.class.getName().replace('.', '/') + ".class";
		        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
		        URL classPathUrl = classLoader.getResource(classPath);
		        String jarPath = classPathUrl.getPath().replaceAll("![^!]*$", "").replaceAll("^(file:|jar:)*", "");
		        jf = new JarFile(jarPath);
		        JarEntry je = jf.getJarEntry("META-INF/MANIFEST.MF");
		        InputStream is = jf.getInputStream(je);
				Properties p = new Properties();
				p.load(is);
				version = p.getProperty("Version-Timestamp");
			} catch (Exception e) {
				e.printStackTrace();
				version = "unknown";
			} finally {
				if (jf != null)
					try {
						jf.close();
					} catch (IOException e) {

					}
			}
		}
		return version;
	}

}