1 /*
   2  * Copyright (c) 2014, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package jdk.vm.ci.options;
  24 
  25 import java.util.ServiceLoader;
  26 import java.util.SortedMap;
  27 import java.util.TreeMap;
  28 
  29 /**
  30  * Helper class used to load option descriptors. Only to be used in the slow-path.
  31  */
  32 public class OptionsLoader {
  33     public static final SortedMap<String, OptionDescriptor> options = new TreeMap<>();
  34 
  35     /**
  36      * Initializes {@link #options} from {@link Options} services.
  37      */
  38     static {
  39         for (OptionDescriptors opts : ServiceLoader.load(OptionDescriptors.class, OptionsLoader.class.getClassLoader())) {
  40             for (OptionDescriptor desc : opts) {
  41                 String name = desc.getName();
  42                 OptionDescriptor existing = options.put(name, desc);
  43                 assert existing == null : "Option named \"" + name + "\" has multiple definitions: " + existing.getLocation() + " and " + desc.getLocation();
  44             }
  45         }
  46     }
  47 }