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- /*
- * Copyright (C) 2012-present the original author or authors.
- *
- * 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 org.pf4j;
-
- import org.slf4j.Logger;
- import org.slf4j.LoggerFactory;
-
- import java.nio.file.Path;
- import java.util.ArrayList;
- import java.util.List;
- import java.util.function.BooleanSupplier;
-
- /**
- * @author Decebal Suiu
- */
- public class CompoundPluginLoader implements PluginLoader {
-
- private static final Logger log = LoggerFactory.getLogger(CompoundPluginLoader.class);
-
- private List<PluginLoader> loaders = new ArrayList<>();
-
- public CompoundPluginLoader add(PluginLoader loader) {
- if (loader == null) {
- throw new IllegalArgumentException("null not allowed");
- }
-
- loaders.add(loader);
-
- return this;
- }
-
- /**
- * Add a {@link PluginLoader} only if the {@code condition} is satisfied.
- *
- * @param loader
- * @param condition
- * @return
- */
- public CompoundPluginLoader add(PluginLoader loader, BooleanSupplier condition) {
- if (condition.getAsBoolean()) {
- return add(loader);
- }
-
- return this;
- }
-
- public int size() {
- return loaders.size();
- }
-
- @Override
- public boolean isApplicable(Path pluginPath) {
- for (PluginLoader loader : loaders) {
- if (loader.isApplicable(pluginPath)) {
- return true;
- }
- }
-
- return false;
- }
-
- @Override
- public ClassLoader loadPlugin(Path pluginPath, PluginDescriptor pluginDescriptor) {
- for (PluginLoader loader : loaders) {
- if (loader.isApplicable(pluginPath)) {
- log.debug("'{}' is applicable for plugin '{}'", loader, pluginPath);
- try {
- ClassLoader classLoader = loader.loadPlugin(pluginPath, pluginDescriptor);
- if (classLoader != null) {
- return classLoader;
- }
- } catch (Exception e) {
- // log the exception and continue with the next loader
- log.error(e.getMessage()); // ?!
- }
- } else {
- log.debug("'{}' is not applicable for plugin '{}'", loader, pluginPath);
- }
- }
-
- throw new RuntimeException("No PluginLoader for plugin '" + pluginPath + "' and descriptor '" + pluginDescriptor + "'");
- }
-
- }
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