org.jboss.modules.ClassLoaderLocalLoader Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.modules;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.UndeclaredThrowableException;
import java.net.URL;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
/**
* @author David M. Lloyd
*/
final class ClassLoaderLocalLoader implements LocalLoader {
static final ClassLoaderLocalLoader SYSTEM = new ClassLoaderLocalLoader(ClassLoaderLocalLoader.class.getClassLoader());
private static final Method getPackage;
private final ClassLoader classLoader;
static {
getPackage = AccessController.doPrivileged(new PrivilegedAction() {
public Method run() {
for (Method method : ClassLoader.class.getDeclaredMethods()) {
if (method.getName().equals("getPackage")) {
Class[] parameterTypes = method.getParameterTypes();
if (parameterTypes.length == 1 && parameterTypes[0] == String.class) {
method.setAccessible(true);
return method;
}
}
}
throw new IllegalStateException("No getPackage method found on ClassLoader");
}
});
}
/**
* Construct a new instance.
*
* @param classLoader the classloader to which we delegate
*/
ClassLoaderLocalLoader(final ClassLoader classLoader) {
this.classLoader = classLoader;
}
// Public members
public Class loadClassLocal(final String name, final boolean resolve) {
try {
return Class.forName(name, resolve, classLoader);
} catch (ClassNotFoundException e) {
return null;
}
}
public Package loadPackageLocal(final String name) {
try {
return (Package) getPackage.invoke(classLoader, name);
} catch (IllegalAccessException e) {
throw new IllegalAccessError(e.getMessage());
} catch (InvocationTargetException e) {
try {
throw e.getCause();
} catch (RuntimeException re) {
throw re;
} catch (Error er) {
throw er;
} catch (Throwable throwable) {
throw new UndeclaredThrowableException(throwable);
}
}
}
public List loadResourceLocal(final String name) {
final Enumeration urls;
ClassLoader classLoader = this.classLoader;
try {
if (classLoader == null) {
urls = ClassLoader.getSystemResources(name);
} else {
urls = classLoader.getResources(name);
}
} catch (IOException e) {
return Collections.emptyList();
}
final List list = new ArrayList();
while (urls.hasMoreElements()) {
list.add(new URLResource(urls.nextElement()));
}
return list;
}
}