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Small core library with minimal dependencies. This code is part of the imagingbook software suite accompanying the image processing textbooks by W. Burger and M.J. Burge (Springer 2006-2022).

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/*******************************************************************************
 * This software is provided as a supplement to the authors' textbooks on digital
 * image processing published by Springer-Verlag in various languages and editions.
 * Permission to use and distribute this software is granted under the BSD 2-Clause
 * "Simplified" License (see http://opensource.org/licenses/BSD-2-Clause).
 * Copyright (c) 2006-2023 Wilhelm Burger, Mark J. Burge. All rights reserved.
 * Visit https://imagingbook.com for additional details.
 ******************************************************************************/

package imagingbook.core;

import java.util.jar.Attributes;
import java.util.jar.Manifest;

/**
 * This class provides version information for this library.
 *
 * @author WB
 */
public abstract class Info {
	// see https://stackoverflow.com/questions/3697449/retrieve-version-from-maven-pom-xml-in-code for alternatives
	private Info() {}

	/**
	 * Reads version information from the MANIFEST.MF file of the JAR file from which this class was loaded.
	 *
	 * @return A string with the version information. "UNKNOWN" is returned if the library was not loaded from a JAR
	 * file or if the version information could not be determined.
	 */
	public static String getVersionInfo() {
		Manifest mf = FileUtils.getJarManifest(Info.class);
		if (mf == null) {
			return "UNKNOWN";
		}
		//IJ.log("listing attributes");
		Attributes attr = mf.getMainAttributes();
		String version = null;
		String buildTime = null;
		try {
			version = attr.getValue("Implementation-Version");
			buildTime = attr.getValue("Build-Time");
		} catch (IllegalArgumentException e) { }
		return version + " (" + buildTime + ")";
	}

}