1 /*
   2  * Copyright (c) 2017, 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.tools.jaotc.collect;
  24 
  25 import jdk.tools.jaotc.LoadedClass;
  26 
  27 import java.util.ArrayList;
  28 import java.util.List;
  29 
  30 public class ClassSearch {
  31     private List<SourceProvider> providers = new ArrayList<>();
  32 
  33     public void addProvider(SourceProvider provider) {
  34         providers.add(provider);
  35     }
  36 
  37     public List<LoadedClass> search(List<SearchFor> search, SearchPath searchPath) {
  38         List<LoadedClass> loaded = new ArrayList<>();
  39 
  40         List<ClassSource> sources = new ArrayList<>();
  41 
  42         for (SearchFor entry : search) {
  43             sources.add(findSource(entry, searchPath));
  44         }
  45 
  46         for (ClassSource source : sources) {
  47             source.eachClass((name, loader) -> loaded.add(loadClass(name, loader)));
  48         }
  49 
  50         return loaded;
  51     }
  52 
  53     private LoadedClass loadClass(String name, ClassLoader loader) {
  54         try {
  55             Class<?> clzz = loader.loadClass(name);
  56             return new LoadedClass(name, clzz);
  57         } catch (ClassNotFoundException e) {
  58             throw new InternalError("Failed to load with: " + loader, e);
  59         }
  60     }
  61 
  62     private ClassSource findSource(SearchFor searchFor, SearchPath searchPath) {
  63         ClassSource found = null;
  64 
  65         for (SourceProvider provider : providers) {
  66             if (!searchFor.isUnknown() && !provider.supports(searchFor.getType())) {
  67                 continue;
  68             }
  69 
  70             ClassSource source = provider.findSource(searchFor.getName(), searchPath);
  71             if (source != null) {
  72                 if (found != null) {
  73                     throw new InternalError("Multiple possible sources: " + source + " and: " + found);
  74                 }
  75                 found = source;
  76             }
  77         }
  78 
  79         if (found == null) {
  80             throw new InternalError("Failed to find: " + searchFor.toString());
  81         }
  82         return found;
  83     }
  84 
  85     public static List<SearchFor> makeList(String type, String argument) {
  86         List<SearchFor> list = new ArrayList<>();
  87         String[] elements = argument.split(":");
  88         for (String element : elements) {
  89             list.add(new SearchFor(element, type));
  90         }
  91         return list;
  92     }
  93 }