--- old/src/java.base/share/classes/jdk/internal/util/jar/VersionedStream.java 2017-11-27 17:23:44.000000000 -0800 +++ /dev/null 2017-11-27 17:23:45.000000000 -0800 @@ -1,85 +0,0 @@ -/* - * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. Oracle designates this - * particular file as subject to the "Classpath" exception as provided - * by Oracle in the LICENSE file that accompanied this code. - * - * This code 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 - * version 2 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - */ - -package jdk.internal.util.jar; - -import java.util.Objects; -import java.util.jar.JarEntry; -import java.util.jar.JarFile; -import java.util.stream.Stream; - -public class VersionedStream { - private static final String META_INF_VERSIONS = "META-INF/versions/"; - - /** - * Returns a stream of versioned entries, derived from the base names of - * all entries in a multi-release {@code JarFile} that are present either in - * the base directory or in any versioned directory with a version number - * less than or equal to the {@code Runtime.Version::major} that the - * {@code JarFile} was opened with. These versioned entries are aliases - * for the real entries -- i.e. the names are base names and the content - * may come from a versioned directory entry. If the {@code jarFile} is not - * a multi-release jar, a stream of all entries is returned. - * - * @param jf the input JarFile - * @return stream of entries - * @since 9 - */ - public static Stream stream(JarFile jf) { - if (jf.isMultiRelease()) { - int version = jf.getVersion().major(); - return jf.stream() - .map(je -> getBaseSuffix(je, version)) - .filter(Objects::nonNull) - .distinct() - .map(jf::getJarEntry); - } - return jf.stream(); - } - - private static String getBaseSuffix(JarEntry je, int version) { - String name = je.getName(); - if (name.startsWith(META_INF_VERSIONS)) { - int len = META_INF_VERSIONS.length(); - int index = name.indexOf('/', len); - if (index == -1 || index == (name.length() - 1)) { - // filter out META-INF/versions/* and META-INF/versions/*/ - return null; - } - try { - if (Integer.parseInt(name, len, index, 10) > version) { - // not an integer - return null; - } - } catch (NumberFormatException x) { - // silently remove malformed entries - return null; - } - // We know name looks like META-INF/versions/*/* - return name.substring(index + 1); - } - return name; - } -}