com.firefly.utils.lang.Loader Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package com.firefly.utils.lang;
import java.net.URL;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
/**
* ClassLoader Helper. This helper class allows classes to be loaded either from
* the Thread's ContextClassLoader, the classloader of the derived class or the
* system ClassLoader.
*
* Usage:
*
*
* public class MyClass {
* void myMethod() {
* ...
* Class c=Loader.loadClass(this.getClass(),classname);
* ...
* }
*
*
*/
public class Loader {
public static URL getResource(String name) {
ClassLoader loader = Thread.currentThread().getContextClassLoader();
return loader == null ? ClassLoader.getSystemResource(name) : loader.getResource(name);
}
/**
* Load a class.
*
* Load a class either from the thread context classloader or if none, the
* system loader
*
*
* @param name
* the name of the new class to load
* @return Class
* @throws ClassNotFoundException
* if not able to find the class
*/
@SuppressWarnings("rawtypes")
public static Class loadClass(String name) throws ClassNotFoundException {
ClassLoader loader = Thread.currentThread().getContextClassLoader();
return (loader == null) ? Class.forName(name) : loader.loadClass(name);
}
/**
* Load a class. Load a class from the same classloader as the passed
* loadClass, or if none then use {@link #loadClass(String)}
*
* @param loaderClass
* a similar class, belong in the same classloader of the desired
* class to load
* @param name
* the name of the new class to load
* @return Class
* @throws ClassNotFoundException
* if not able to find the class
*/
@SuppressWarnings("rawtypes")
public static Class loadClass(Class loaderClass, String name) throws ClassNotFoundException {
if (loaderClass != null && loaderClass.getClassLoader() != null)
return loaderClass.getClassLoader().loadClass(name);
return loadClass(name);
}
public static ResourceBundle getResourceBundle(String name, boolean checkParents, Locale locale)
throws MissingResourceException {
ClassLoader loader = Thread.currentThread().getContextClassLoader();
return loader == null ? ResourceBundle.getBundle(name, locale) : ResourceBundle.getBundle(name, locale, loader);
}
}