ch.qos.logback.classic.util.EnvUtil Maven / Gradle / Ivy
/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2015, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package ch.qos.logback.classic.util;
import java.util.Iterator;
import java.util.ServiceLoader;
import ch.qos.logback.core.util.Loader;
/**
* @author Ceki Gülcü
*/
public class EnvUtil {
/*
* Used to replace the ClassLoader that the ServiceLoader uses for unit testing. We need this to mock the resources
* the ServiceLoader attempts to load from /META-INF/services thus keeping the projects src/test/resources clean
* (see src/test/resources/README.txt).
*/
static ClassLoader testServiceLoaderClassLoader = null;
static public boolean isGroovyAvailable() {
ClassLoader classLoader = Loader.getClassLoaderOfClass(EnvUtil.class);
try {
Class bindingClass = classLoader.loadClass("groovy.lang.Binding");
return (bindingClass != null);
} catch (ClassNotFoundException e) {
return false;
}
}
private static ClassLoader getServiceLoaderClassLoader() {
return testServiceLoaderClassLoader == null ? Loader.getClassLoaderOfClass(EnvUtil.class) : testServiceLoaderClassLoader;
}
public static T loadFromServiceLoader(Class c) {
ServiceLoader loader = ServiceLoader.load(c, getServiceLoaderClassLoader());
Iterator it = loader.iterator();
if (it.hasNext())
return it.next();
return null;
}
}