org.microemu.app.util.RuntimeDetect Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of microemulator Show documentation
MicroEmulator one jar assembly for distribution.
The newest version!
/**
 *  MicroEmulator
 *  Copyright (C) 2006-2008 Bartek Teodorczyk 
 *  Copyright (C) 2006-2008 Vlad Skarzhevskyy
 *
 *  It is licensed under the following two licenses as alternatives:
 *    1. GNU Lesser General Public License (the "LGPL") version 2.1 or any newer version
 *    2. Apache License (the "AL") Version 2.0
 *
 *  You may not use this file except in compliance with at least one of
 *  the above two licenses.
 *
 *  You may obtain a copy of the LGPL at
 *      http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
 *
 *  You may obtain a copy of the AL 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 LGPL or the AL for the specific language governing permissions and
 *  limitations.
 *
 *  @version $Id: RuntimeDetect.java 1877 2008-12-17 22:01:58Z vlads $
 */
package org.microemu.app.util;

/**
 * Detect Java runtime environment.
 * 
 * @author vlads
 */
public class RuntimeDetect {

	private static boolean java13 = false;

	private static boolean java14 = false;

	private static boolean java15 = false;

	private static boolean inEclipseUnitTests = false;

	private static boolean runtimeDetected = false;

	private static synchronized void detect() {
		if (runtimeDetected) {
			return;
		}
		if (detectJava14()) {
			detectJava15();
			detectEclipse();
		}
		runtimeDetected = true;
	}

	private static synchronized boolean detectJava14() {
		try {
			Class.forName("java.lang.StackTraceElement");
			java14 = true;
		} catch (Throwable ignore) {
		}
		return java14;
	}

	private static boolean detectJava15() {
		try {
			java5Function();
			java15 = true;
		} catch (Throwable ignore) {
		}
		return java15;
	}

	private static boolean java5Function() {
		return (Thread.currentThread().getStackTrace() != null);
	}

	private static void detectEclipse() {
		StackTraceElement[] ste = new Throwable().getStackTrace();
		for (int i = 0; i < ste.length; i++) {
			StackTraceElement s = ste[i];
			if (s.getClassName().startsWith("org.eclipse.jdt")) {
				inEclipseUnitTests = true;
				break;
			}
		}
	}

	public static boolean isJava13() {
		detect();
		return java13;
	}

	public static boolean isJava14() {
		detect();
		return java14;
	}

	public static boolean isJava15() {
		detect();
		return java15;
	}

	public static boolean isInEclipseUnitTests() {
		detect();
		return inEclipseUnitTests;
	}
}