package ru.gravit.launcher.relauncher;

public final class JavaVersionInfo {
	/**
	 * The major version number of class files for JDK 1.1.
	 */
	public static final int JAVA_1 = 45;

	/**
	 * The major version number of class files for JDK 10.
	 */
	public static final int JAVA_10 = 54;

	/**
	 * The major version number of class files for JDK 11.
	 */
	public static final int JAVA_11 = 55;

	/**
	 * The major version number of class files for JDK 1.2.
	 */
	public static final int JAVA_2 = 46;

	/**
	 * The major version number of class files for JDK 1.3.
	 */
	public static final int JAVA_3 = 47;

	/**
	 * The major version number of class files for JDK 1.4.
	 */
	public static final int JAVA_4 = 48;

	/**
	 * The major version number of class files for JDK 1.5.
	 */
	public static final int JAVA_5 = 49;

	/**
	 * The major version number of class files for JDK 1.6.
	 */
	public static final int JAVA_6 = 50;

	/**
	 * The major version number of class files for JDK 1.7.
	 */
	public static final int JAVA_7 = 51;

	/**
	 * The major version number of class files for JDK 1.8.
	 */
	public static final int JAVA_8 = 52;

	/**
	 * The major version number of class files for JDK 1.9.
	 */
	public static final int JAVA_9 = 53;

	/**
	 * The major version number of class files created from scratch. The default
	 * value is 47 (JDK 1.3). It is 49 (JDK 1.5) if the JVM supports
	 * <code>java.lang.StringBuilder</code>. It is 50 (JDK 1.6) if the JVM supports
	 * <code>java.util.zip.DeflaterInputStream</code>. It is 51 (JDK 1.7) if the JVM
	 * supports <code>java.lang.invoke.CallSite</code>. It is 52 (JDK 1.8) if the
	 * JVM supports <code>java.util.function.Function</code>. It is 53 (JDK 1.9) if
	 * the JVM supports <code>java.lang.reflect.Module</code>. It is 54 (JDK 10) if
	 * the JVM supports <code>java.util.List.copyOf(Collection)</code>. It is 55
	 * (JDK 11) if the JVM supports <code>java.util.Optional.isEmpty()</code>.
	 */
	public static final int MAJOR_VERSION;
	static {
		int ver = JAVA_3;
		try {
			Class.forName("java.lang.StringBuilder");
			ver = JAVA_5;
			Class.forName("java.util.zip.DeflaterInputStream");
			ver = JAVA_6;
			Class.forName("java.lang.invoke.CallSite", false, ClassLoader.getSystemClassLoader());
			ver = JAVA_7;
			Class.forName("java.util.function.Function");
			ver = JAVA_8;
			Class.forName("java.lang.Module");
			ver = JAVA_9;
			Class.forName("java.util.List").getMethod("copyOf", Class.forName("java.util.Collection"));
			ver = JAVA_10;
			Class.forName("java.util.Optional").getMethod("isEmpty");
			ver = JAVA_11;
		} catch (final Throwable t) {
		}
		MAJOR_VERSION = ver;
	}

	public static final int getVersion() {
		return MAJOR_VERSION;
	}
}