corda/classpath/avian/SystemClassLoader.java
Joel Dice 87b02eb949 update copyright years
Previously, I used a shell script to extract modification date ranges
from the Git history, but that was complicated and unreliable, so now
every file just gets the same year range in its copyright header.  If
someone needs to know when a specific file was modified and by whom,
they can look at the Git history themselves; no need to include it
redundantly in the header.
2013-07-02 20:52:38 -06:00

126 lines
3.2 KiB
Java

/* Copyright (c) 2008-2013, Avian Contributors
Permission to use, copy, modify, and/or distribute this software
for any purpose with or without fee is hereby granted, provided
that the above copyright notice and this permission notice appear
in all copies.
There is NO WARRANTY for this software. See license.txt for
details. */
package avian;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.ArrayList;
import java.util.Enumeration;
public class SystemClassLoader extends ClassLoader {
private native VMClass findVMClass(String name)
throws ClassNotFoundException;
protected Class findClass(String name) throws ClassNotFoundException {
return getClass(findVMClass(name));
}
public static native Class getClass(VMClass vmClass);
public static native VMClass vmClass(Class jClass);
private native VMClass findLoadedVMClass(String name);
protected Class reallyFindLoadedClass(String name){
VMClass c = findLoadedVMClass(name);
return c == null ? null : getClass(c);
}
protected Class loadClass(String name, boolean resolve)
throws ClassNotFoundException
{
Class c = findLoadedClass(name);
if (c == null) {
ClassLoader parent = getParent();
if (parent != null) {
try {
c = parent.loadClass(name);
} catch (ClassNotFoundException ok) { }
}
if (c == null) {
c = findClass(name);
}
}
if (resolve) {
resolveClass(c);
}
return c;
}
private native String resourceURLPrefix(String name);
protected URL findResource(String name) {
String prefix = resourceURLPrefix(name);
if (prefix != null) {
try {
return new URL(prefix + name);
} catch (MalformedURLException ignored) { }
}
return null;
}
// OpenJDK's java.lang.ClassLoader.getResource makes use of
// sun.misc.Launcher to load bootstrap resources, which is not
// appropriate for the Avian build, so we override it to ensure we
// get the behavior we want. This implementation is the same as
// that of Avian's java.lang.ClassLoader.getResource.
public URL getResource(String path) {
URL url = null;
ClassLoader parent = getParent();
if (parent != null) {
url = parent.getResource(path);
}
if (url == null) {
url = findResource(path);
}
return url;
}
// As above, we override this method to avoid inappropriate behavior
// in OpenJDK's java.lang.ClassLoader.getResources.
public Enumeration<URL> getResources(String name) throws IOException {
Collection<URL> urls = new ArrayList<URL>(5);
ClassLoader parent = getParent();
if (parent != null) {
for (Enumeration<URL> e = parent.getResources(name);
e.hasMoreElements();)
{
urls.add(e.nextElement());
}
}
URL url = findResource(name);
if (url != null) {
urls.add(url);
}
return Collections.enumeration(urls);
}
protected Enumeration<URL> findResources(String name) {
Collection<URL> urls = new ArrayList(1);
URL url = findResource(name);
if (url != null) {
urls.add(url);
}
return Collections.enumeration(urls);
}
}