diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/jdk.zipfs/share/classes/jdk/nio/zipfs/JarFileSystem.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/jdk.zipfs/share/classes/jdk/nio/zipfs/JarFileSystem.java Tue Sep 12 19:03:39 2017 +0200 @@ -0,0 +1,184 @@ +/* + * Copyright (c) 2015, 2017, 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.nio.zipfs; + +import java.io.IOException; +import java.io.InputStream; +import java.lang.Runtime.Version; +import java.nio.file.NoSuchFileException; +import java.nio.file.Path; +import java.util.Arrays; +import java.util.HashMap; +import java.util.Map; +import java.util.TreeMap; +import java.util.function.Consumer; +import java.util.function.Function; +import java.util.jar.Attributes; +import java.util.jar.Manifest; + +/** + * Adds aliasing to ZipFileSystem to support multi-release jar files. An alias map + * is created by {@link JarFileSystem#createVersionedLinks(int)}. The map is then + * consulted when an entry is looked up in {@link JarFileSystem#getEntry(byte[])} + * to determine if the entry has a corresponding versioned entry. If so, the + * versioned entry is returned. + * + * @author Steve Drach + */ + +class JarFileSystem extends ZipFileSystem { + private Function lookup; + + @Override + IndexNode getInode(byte[] path) { + // check for an alias to a versioned entry + byte[] versionedPath = lookup.apply(path); + return versionedPath == null ? super.getInode(path) : super.getInode(versionedPath); + } + + JarFileSystem(ZipFileSystemProvider provider, Path zfpath, Map env) + throws IOException { + super(provider, zfpath, env); + lookup = path -> path; // lookup needs to be set before isMultiReleaseJar is called + // because it eventually calls getEntry + if (isMultiReleaseJar()) { + int version; + Object o = env.get("multi-release"); + if (o instanceof String) { + String s = (String)o; + if (s.equals("runtime")) { + version = Runtime.version().major(); + } else { + version = Integer.parseInt(s); + } + } else if (o instanceof Integer) { + version = (Integer)o; + } else if (o instanceof Version) { + version = ((Version)o).major(); + } else { + throw new IllegalArgumentException("env parameter must be String, Integer, " + + "or Version"); + } + lookup = createVersionedLinks(version < 0 ? 0 : version); + setReadOnly(); + } + } + + private boolean isMultiReleaseJar() throws IOException { + try (InputStream is = newInputStream(getBytes("/META-INF/MANIFEST.MF"))) { + String multiRelease = new Manifest(is).getMainAttributes() + .getValue(Attributes.Name.MULTI_RELEASE); + return "true".equalsIgnoreCase(multiRelease); + } catch (NoSuchFileException x) { + return false; + } + } + + /** + * create a map of aliases for versioned entries, for example: + * version/PackagePrivate.class -> META-INF/versions/9/version/PackagePrivate.class + * version/PackagePrivate.java -> META-INF/versions/9/version/PackagePrivate.java + * version/Version.class -> META-INF/versions/10/version/Version.class + * version/Version.java -> META-INF/versions/10/version/Version.java + * + * then wrap the map in a function that getEntry can use to override root + * entry lookup for entries that have corresponding versioned entries + */ + private Function createVersionedLinks(int version) { + HashMap aliasMap = new HashMap<>(); + getVersionMap(version, getInode(getBytes("/META-INF/versions"))).values() + .forEach(versionNode -> { // for each META-INF/versions/{n} directory + // put all the leaf inodes, i.e. entries, into the alias map + // possibly shadowing lower versioned entries + walk(versionNode, entryNode -> { + byte[] rootName = getRootName(versionNode, entryNode); + if (rootName != null) { + IndexNode rootNode = getInode(rootName); + if (rootNode == null) { // no matching root node, make a virtual one + rootNode = IndexNode.keyOf(rootName); + } + aliasMap.put(rootNode, entryNode.name); + } + }); + }); + return path -> aliasMap.get(IndexNode.keyOf(path)); + } + + /** + * create a sorted version map of version -> inode, for inodes <= max version + * 9 -> META-INF/versions/9 + * 10 -> META-INF/versions/10 + */ + private TreeMap getVersionMap(int version, IndexNode metaInfVersions) { + TreeMap map = new TreeMap<>(); + IndexNode child = metaInfVersions.child; + while (child != null) { + Integer key = getVersion(child.name, metaInfVersions.name.length + 1); + if (key != null && key <= version) { + map.put(key, child); + } + child = child.sibling; + } + return map; + } + + /** + * extract the integer version number -- META-INF/versions/9 returns 9 + */ + private Integer getVersion(byte[] name, int offset) { + try { + return Integer.parseInt(getString(Arrays.copyOfRange(name, offset, name.length))); + } catch (NumberFormatException x) { + // ignore this even though it might indicate issues with the JAR structure + return null; + } + } + + /** + * walk the IndexNode tree processing all leaf nodes + */ + private void walk(IndexNode inode, Consumer process) { + if (inode == null) return; + if (inode.isDir()) { + walk(inode.child, process); + } else { + process.accept(inode); + } + walk(inode.sibling, process); + } + + /** + * extract the root name from a versioned entry name + * given inode for META-INF/versions/9/foo/bar.class + * and prefix META-INF/versions/9/ + * returns foo/bar.class + */ + private byte[] getRootName(IndexNode prefix, IndexNode inode) { + int offset = prefix.name.length; + byte[] fullName = inode.name; + return Arrays.copyOfRange(fullName, offset, fullName.length); + } +}