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