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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.lang.reflect.Constructor;
- import java.lang.reflect.Modifier;
-
- /**
- * The default implementation for {@link PluginFactory}.
- * It uses {@link Constructor#newInstance(Object...)} method.
- *
- * @author Decebal Suiu
- */
- public class DefaultPluginFactory implements PluginFactory {
-
- private static final Logger log = LoggerFactory.getLogger(DefaultPluginFactory.class);
-
- /**
- * Creates a plugin instance. If an error occurs than that error is logged and the method returns {@code null}.
- */
- @Override
- public Plugin create(final PluginWrapper pluginWrapper) {
- String pluginClassName = pluginWrapper.getDescriptor().getPluginClass();
- log.debug("Create instance for plugin '{}'", pluginClassName);
-
- Class<?> pluginClass;
- try {
- pluginClass = pluginWrapper.getPluginClassLoader().loadClass(pluginClassName);
- } catch (ClassNotFoundException e) {
- log.error(e.getMessage(), e);
- return null;
- }
-
- // once we have the class, we can do some checks on it to ensure
- // that it is a valid implementation of a plugin.
- int modifiers = pluginClass.getModifiers();
- if (Modifier.isAbstract(modifiers) || Modifier.isInterface(modifiers)
- || (!Plugin.class.isAssignableFrom(pluginClass))) {
- log.error("The plugin class '{}' is not valid", pluginClassName);
- return null;
- }
-
- return createInstance(pluginClass, pluginWrapper);
- }
-
- protected Plugin createInstance(Class<?> pluginClass, PluginWrapper pluginWrapper) {
- try {
- Constructor<?> constructor = pluginClass.getConstructor(PluginWrapper.class);
- return (Plugin) constructor.newInstance(pluginWrapper);
- } catch (NoSuchMethodException e) {
- return createUsingNoParametersConstructor(pluginClass);
- } catch (Exception e) {
- log.error(e.getMessage(), e);
- }
-
- return null;
- }
-
- protected Plugin createUsingNoParametersConstructor(Class<?> pluginClass) {
- try {
- Constructor<?> constructor = pluginClass.getConstructor();
- return (Plugin) constructor.newInstance();
- } catch (Exception e) {
- log.error(e.getMessage(), e);
- }
-
- return null;
- }
-
- }
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