| // Copyright (C) 2012 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.gerrit.server.rules.prolog; |
| |
| import com.google.common.collect.LinkedHashMultimap; |
| import com.google.common.collect.SetMultimap; |
| import com.google.gerrit.server.plugincontext.PluginSetContext; |
| import java.util.Set; |
| |
| /** Loads the classes for Prolog predicates. */ |
| class PredicateClassLoader extends ClassLoader { |
| |
| private final SetMultimap<String, ClassLoader> packageClassLoaderMap = |
| LinkedHashMultimap.create(); |
| |
| PredicateClassLoader(PluginSetContext<PredicateProvider> predicateProviders, ClassLoader parent) { |
| super(parent); |
| |
| predicateProviders.runEach( |
| predicateProvider -> { |
| for (String pkg : predicateProvider.getPackages()) { |
| packageClassLoaderMap.put(pkg, predicateProvider.getClass().getClassLoader()); |
| } |
| }); |
| } |
| |
| @Override |
| protected Class<?> findClass(String className) throws ClassNotFoundException { |
| final Set<ClassLoader> classLoaders = packageClassLoaderMap.get(getPackageName(className)); |
| for (ClassLoader cl : classLoaders) { |
| try { |
| return Class.forName(className, true, cl); |
| } catch (ClassNotFoundException e) { |
| // ignore |
| } |
| } |
| throw new ClassNotFoundException(className); |
| } |
| |
| private static String getPackageName(String className) { |
| final int pos = className.lastIndexOf('.'); |
| if (pos < 0) { |
| return ""; |
| } |
| return className.substring(0, pos); |
| } |
| } |