/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.nutsnbolts.spring;
import java.io.File;
import org.smallmind.nutsnbolts.lang.ClasspathClassGate;
import org.smallmind.nutsnbolts.lang.GatingClassLoader;
import org.springframework.context.support.FileSystemXmlApplicationContext;
public class ExtensionLoader<E extends ExtensionInstance> {
private E extensionInstance;
private GatingClassLoader classLoader;
public ExtensionLoader (Class<E> extensionInstanceClass, String springFileName)
throws ExtensionLoaderException {
File extensionFile = new File(System.getProperty("user.dir") + "/" + springFileName);
if (extensionFile.exists()) {
FileSystemXmlApplicationContext applicationContext = new FileSystemXmlApplicationContext(extensionFile.getAbsolutePath());
try {
extensionInstance = applicationContext.getBean(extensionInstanceClass);
}
catch (Throwable throwable) {
throw new ExtensionLoaderException(throwable, "Unable to execute extension configuration(%s)", extensionFile.getAbsolutePath());
}
if ((extensionInstance.getClasspathComponents() != null) && (extensionInstance.getClasspathComponents().length > 0)) {
File classpathComponentFile;
String[] normalizedPathComponents = new String[extensionInstance.getClasspathComponents().length];
int componentIndex = 0;
for (String classpathComponent : extensionInstance.getClasspathComponents()) {
classpathComponentFile = new File(classpathComponent);
normalizedPathComponents[componentIndex++] = classpathComponentFile.isAbsolute() ? classpathComponent : System.getProperty("user.dir") + '/' + classpathComponent;
}
Thread.currentThread().setContextClassLoader(classLoader = new GatingClassLoader(Thread.currentThread().getContextClassLoader(), -1, new ClasspathClassGate(normalizedPathComponents)));
}
}
}
protected E getExtensionInstance () {
return extensionInstance;
}
public GatingClassLoader getClassLoader () {
return classLoader;
}
}