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Common Lisp implementation running on the JVM
/*
* JavaClassLoader.java
*
* Copyright (C) 2003-2005 Peter Graves
* $Id: JavaClassLoader.java 13369 2011-07-01 14:00:27Z mevenson $
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
package org.armedbear.lisp;
import static org.armedbear.lisp.Lisp.*;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.net.URL;
import java.net.URLClassLoader;
public class JavaClassLoader extends URLClassLoader {
private static JavaClassLoader persistentInstance;
private static Set packages = Collections.synchronizedSet(new HashSet());
public JavaClassLoader()
{
this(JavaClassLoader.class.getClassLoader());
}
public JavaClassLoader(ClassLoader parent) {
super(new URL[] {}, parent);
}
public JavaClassLoader(URL[] classpath, ClassLoader parent) {
super(classpath, parent);
}
public static JavaClassLoader getPersistentInstance()
{
return getPersistentInstance(null);
}
public static JavaClassLoader getPersistentInstance(String packageName)
{
if (persistentInstance == null)
persistentInstance = new JavaClassLoader();
definePackage(packageName);
return persistentInstance;
}
private static void definePackage(String packageName)
{
if (packageName != null && !packages.contains(packageName)) {
persistentInstance.definePackage(packageName,"","1.0","","","1.0","",null);
packages.add(packageName);
}
}
public Class loadClassFromByteArray(byte[] classbytes) {
return loadClassFromByteArray(null, classbytes);
}
public Class loadClassFromByteArray(String className,
byte[] classbytes)
{
try {
long length = classbytes.length;
if (length < Integer.MAX_VALUE) {
Class c =
defineClass(className, classbytes, 0, (int) length);
if (c != null) {
resolveClass(c);
return c;
}
}
}
catch (LinkageError e) {
throw e;
}
catch (Throwable t) {
Debug.trace(t);
}
return null;
}
public Class loadClassFromByteArray(String className, byte[] bytes,
int offset, int length)
{
try {
Class c = defineClass(className, bytes, offset, length);
if (c != null) {
resolveClass(c);
return c;
}
}
catch (VerifyError e)
{
error(new LispError("Class verification failed: " + e.getMessage()));
}
catch (Throwable t) {
Debug.trace(t);
}
return null;
}
@Override
public void addURL(URL url) {
super.addURL(url);
}
public static final Symbol CLASSLOADER = PACKAGE_JAVA.intern("*CLASSLOADER*");
private static final Primitive GET_DEFAULT_CLASSLOADER = new pf_get_default_classloader();
private static final class pf_get_default_classloader extends Primitive {
private final LispObject defaultClassLoader = new JavaObject(new JavaClassLoader());
pf_get_default_classloader() {
super("get-default-classloader", PACKAGE_JAVA, true, "");
}
@Override
public LispObject execute() {
return defaultClassLoader;
}
};
// ### make-classloader &optional parent => java-class-loader
private static final Primitive MAKE_CLASSLOADER = new pf_make_classloader();
private static final class pf_make_classloader extends Primitive
{
pf_make_classloader()
{
super("make-classloader", PACKAGE_JAVA, true, "&optional parent");
}
@Override
public LispObject execute() {
return new JavaObject(new JavaClassLoader(getCurrentClassLoader()));
}
@Override
public LispObject execute(LispObject parent) {
return new JavaObject(new JavaClassLoader((ClassLoader) parent.javaInstance(ClassLoader.class)));
}
};
// ### dump-classpath &optional classloader => list-of-pathname-lists
private static final Primitive DUMP_CLASSPATH = new pf_dump_classpath();
private static final class pf_dump_classpath extends Primitive
{
pf_dump_classpath()
{
super("dump-classpath", PACKAGE_JAVA, true, "&optional classloader");
}
@Override
public LispObject execute() {
return execute(new JavaObject(getCurrentClassLoader()));
}
@Override
public LispObject execute(LispObject classloader) {
LispObject list = NIL;
Object o = classloader.javaInstance();
while(o instanceof ClassLoader) {
ClassLoader cl = (ClassLoader) o;
list = list.push(dumpClassPath(cl));
o = cl.getParent();
}
return list.nreverse();
}
};
private static final Primitive GET_CURRENT_CLASSLOADER = new pf_get_current_classloader();
@DocString(name="get-current-classloader")
private static final class pf_get_current_classloader extends Primitive {
pf_get_current_classloader() {
super("get-current-classloader", PACKAGE_JAVA, true);
}
@Override
public LispObject execute() {
return new JavaObject(getCurrentClassLoader());
}
};
// ### %add-to-classpath jar-or-jars &optional (classloader (get-current-classloader))
private static final Primitive ADD_TO_CLASSPATH = new pf_add_to_classpath();
private static final class pf_add_to_classpath extends Primitive
{
pf_add_to_classpath()
{
super("%add-to-classpath", PACKAGE_JAVA, false,
"jar-or-jars &optional (classloader (get-current-classloader))");
}
@Override
public LispObject execute(LispObject jarOrJars) {
return execute(jarOrJars, new JavaObject(getCurrentClassLoader()));
}
@Override
public LispObject execute(LispObject jarOrJars, LispObject classloader) {
Object o = classloader.javaInstance();
if(o instanceof JavaClassLoader) {
JavaClassLoader jcl = (JavaClassLoader) o;
if(jarOrJars instanceof Cons) {
while(jarOrJars != NIL) {
addURL(jcl, jarOrJars.car());
jarOrJars = jarOrJars.cdr();
}
} else {
addURL(jcl, jarOrJars);
}
return T;
} else {
return error(new TypeError(o + " must be an instance of " + JavaClassLoader.class.getName()));
}
}
};
protected static void addURL(JavaClassLoader jcl, LispObject jar) {
if (jar instanceof Pathname) {
jcl.addURL(((Pathname) jar).toURL());
} else if (jar instanceof AbstractString) {
jcl.addURL(new Pathname(jar.toString()).toURL());
} else {
error(new TypeError(jar + " must be a pathname designator"));
}
}
public static LispObject dumpClassPath(ClassLoader o) {
if(o instanceof URLClassLoader) {
LispObject list = NIL;
for(URL u : ((URLClassLoader) o).getURLs()) {
list = list.push(new Pathname(u));
}
return new Cons(new JavaObject(o), list.nreverse());
} else {
return new JavaObject(o);
}
}
public static ClassLoader getCurrentClassLoader() {
LispObject classLoader = CLASSLOADER.symbolValueNoThrow();
if(classLoader != null) {
return (ClassLoader) classLoader.javaInstance(ClassLoader.class);
} else {
return Lisp.class.getClassLoader();
}
}
}