content: /*
   * 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.
   *
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  package openjdk.tools.jdeps;
  
  import openjdk.tools.classfile.ClassFile;
  import openjdk.tools.classfile.ConstantPoolException;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.jar.JarEntry;
  import java.util.jar.JarFile;
  
  public class VersionHelper {
      private static final String META_INF_VERSIONS = "META-INF/versions/";
      private static final Map<String,String> nameToVersion = new ConcurrentHashMap<>();
  
      public static String get(String classname) {
          if (nameToVersion.containsKey(classname)) {
              return nameToVersion.get(classname) + "/" + classname;
          }
          return classname;
      }
  
      public static void add(JarFile jarfile, JarEntry e, ClassFile cf)
              throws ConstantPoolException
      {
          String realName = e.getRealName();
          if (realName.startsWith(META_INF_VERSIONS)) {
              int len = META_INF_VERSIONS.length();
              int n = realName.indexOf('/', len);
              if (n > 0) {
                  String version = realName.substring(len, n);
                  assert (Integer.parseInt(version) > 8);
                  String name = cf.getName().replace('/', '.');
                  if (nameToVersion.containsKey(name)) {
                      if (!version.equals(nameToVersion.get(name))) {
                          throw new MultiReleaseException(
                                  "err.multirelease.version.associated",
                                  name, nameToVersion.get(name), version
                          );
                      }
                  } else {
                      nameToVersion.put(name, version);
                  }
              } else {
                  throw new MultiReleaseException("err.multirelease.jar.malformed",
                          jarfile.getName(), realName);
              }
          }
      }
  }
  