| /* |
| * 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<byte[],byte[]> 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<String,?> 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<byte[],byte[]> createVersionedLinks(int version) { |
| HashMap<IndexNode,byte[]> 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<Integer, IndexNode> getVersionMap(int version, IndexNode metaInfVersions) { |
| TreeMap<Integer,IndexNode> 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<IndexNode> 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); |
| } |
| } |