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Cobertura is a free Java tool that calculates the percentage of code accessed by tests. It can be used to identify which parts of your Java program are lacking test coverage. It is based on jcoverage.

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/*
 * Cobertura - http://cobertura.sourceforge.net/
 *
 * Copyright (C) 2005 Grzegorz Lukasik
 * Copyright (C) 2006 John Lewis
 * Copyright (C) 2006 Mark Doliner
 *
 * Note: This file is dual licensed under the GPL and the Apache
 * Source License (so that it can be used from both the main
 * Cobertura classes and the ant tasks).
 *
 * Cobertura is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * Cobertura 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Cobertura; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

package net.sourceforge.cobertura.util;

/**
 * Utility methods for working with archives.
 *
 * @author John Lewis
 */
public abstract class ArchiveUtil {

	/**
	 * Return true if the given name ends with .jar, .zip,
	 * .war, .ear, or .sar (case insensitive).
	 *
	 * @param name The file name.
	 *
	 * @return true if the name is an archive.
	 */
	public static boolean isArchive(String name) {
		name = name.toLowerCase();
		return name.endsWith(".jar") || name.endsWith(".zip")
				|| name.endsWith(".war") || name.endsWith(".ear")
				|| name.endsWith(".sar");
	}

	/**
	 * Check to see if the given file name is a signature file
	 * (meta-inf/*.rsa or meta-inf/*.sf).
	 *
	 * @param name The file name.  Commonly a ZipEntry name.
	 *
	 * @return true if the name is a signature file.
	 */
	public static boolean isSignatureFile(String name) {
		name = name.toLowerCase();
		return (name.startsWith("meta-inf/") && (name.endsWith(".rsa") || name
				.endsWith(".sf")));
	}

}