1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.tools.jdeps;
  27 
  28 import com.sun.tools.classfile.ClassFile;
  29 import com.sun.tools.classfile.ConstantPoolException;
  30 import jdk.internal.misc.SharedSecrets;
  31 
  32 import java.util.Map;
  33 import java.util.concurrent.ConcurrentHashMap;
  34 import java.util.jar.JarEntry;
  35 import java.util.jar.JarFile;
  36 
  37 public class VersionHelper {
  38     private static final String META_INF_VERSIONS = "META-INF/versions/";
  39     private static final Map<String,String> nameToVersion = new ConcurrentHashMap<>();
  40 
  41     public static String get(String classname) {
  42         if (nameToVersion.containsKey(classname)) {
  43             return nameToVersion.get(classname) + "/" + classname;
  44         }
  45         return classname;
  46     }
  47 
  48     public static void add(JarFile jarfile, JarEntry e, ClassFile cf)
  49             throws ConstantPoolException
  50     {
  51         String realName = SharedSecrets.javaUtilJarAccess().getRealName(jarfile, e);
  52         if (realName.startsWith(META_INF_VERSIONS)) {
  53             int len = META_INF_VERSIONS.length();
  54             int n = realName.indexOf('/', len);
  55             if (n > 0) {
  56                 String version = realName.substring(len, n);
  57                 assert (Integer.parseInt(version) > 8);
  58                 String name = cf.getName().replace('/', '.');
  59                 if (nameToVersion.containsKey(name)) {
  60                     if (!version.equals(nameToVersion.get(name))) {
  61                         throw new MultiReleaseException(
  62                                 "err.multirelease.version.associated",
  63                                 name, nameToVersion.get(name), version
  64                         );
  65                     }
  66                 } else {
  67                     nameToVersion.put(name, version);
  68                 }
  69             } else {
  70                 throw new MultiReleaseException("err.multirelease.jar.malformed",
  71                         jarfile.getName(), realName);
  72             }
  73         }
  74     }
  75 }
--- EOF ---