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package cbt;
import java.io.*;
import java.net.*;
import java.util.*;
import static cbt.Stage0Lib.*;
import java.util.concurrent.ConcurrentHashMap;
public class CbtURLClassLoader extends java.net.URLClassLoader{
public String toString(){
return (
super.toString()
+ "(\n "
+ Arrays.toString(getURLs())
+ ",\n "
+ mkString("\n ",(getParent() == null?"":getParent().toString()).split("\n"))
+ "\n)"
);
}
ConcurrentHashMap<Object,Object> cache = new ConcurrentHashMap<Object,Object>();
public Class loadClass(String name) throws ClassNotFoundException{
Class _class = super.loadClass(name);
if(_class == null) throw new ClassNotFoundException(name);
else return _class;
}
public Class loadClass(String name, boolean resolve) throws ClassNotFoundException{
//System.out.println("loadClass("+name+") on \n"+this);
synchronized( cache ){
if(!cache.containsKey(name))
cache.put(name, new Object());
}
Object key = cache.get(name);
synchronized( key ){
if(!cache.containsKey(key)){
try{
cache.put(key, super.loadClass(name, resolve));
} catch (ClassNotFoundException e){
cache.put(key, Object.class);
}
}
Class _class = (Class) cache.get(key);
if(_class == Object.class){
if( name.equals("java.lang.Object") )
return Object.class;
else return null;
} else {
return _class;
}
}
}
void assertExist(URL[] urls){
for(URL url: urls){
if(!new File(url.getPath()).exists()){
throw new AssertionError("File does not exist when trying to create CbtURLClassLoader: "+url);
}
}
}
public CbtURLClassLoader(URL[] urls, ClassLoader parent){
super(urls, parent);
assertExist(urls);
}
public CbtURLClassLoader(URL[] urls){
super(urls, null);
assertExist(urls);
}
}
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