--- /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<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);
+ }
+}