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import java.net.URLClassLoader;
import java.net.URL;
import java.util.HashMap;
import java.util.Vector;
import java.util.Enumeration;
import java.io.File;
public class JRIClassLoader extends URLClassLoader {
HashMap libMap;
Vector children;
static JRIClassLoader mainLoader;
public static JRIClassLoader getMainLoader() {
if (mainLoader == null) mainLoader = new JRIClassLoader();
return mainLoader;
}
public JRIClassLoader() {
super(new URL[]{});
children = new Vector();
libMap = new HashMap();
System.out.println("JRIClassLoader: new loader "+this);
}
public void registerLoader(DelegatedClassLoader cl) {
if (!children.contains(cl))
children.add(cl);
}
public void unregisterLoader(DelegatedClassLoader cl) {
children.removeElement(cl);
}
public void registerLibrary(String name, File f) {
libMap.put(name, f);
}
/** add path to the class path list
@param path string denoting the path to the file or directory */
public void addClassPath(String path) {
try {
File f = new File(path);
if (f.exists()) addURL(f.toURL());
} catch (Exception x) {}
}
/** add path to the class path list
@param f file/directory to add to the list */
public void addClassPath(File f) {
try {
if (f.exists()) addURL(f.toURL());
} catch (Exception x) {}
}
protected String findLibrary(String name) {
String s = null;
System.out.println("boot findLibrary(\""+name+"\")");
try {
for (Enumeration e = children.elements() ; e.hasMoreElements() ;) {
DelegatedClassLoader cl = (DelegatedClassLoader)e.nextElement();
if (cl != null) {
s = cl.delegatedFindLibrary(name);
if (s != null) {
System.out.println(" - found delegated answer "+s+" from "+cl);
return s;
}
}
}
} catch (Exception ex) {}
File u = (File) libMap.get(name);
if (u!=null && u.exists()) s=u.getAbsolutePath();
System.out.println(" - mapping to "+((s==null)?"<none>":s));
return s;
}
public Class findAndLinkClass(String name) throws ClassNotFoundException {
Class c = findClass(name);
resolveClass(c);
return c;
}
protected Class findClass(String name) throws ClassNotFoundException {
Class cl = null;
System.out.println("boot findClass(\""+name+"\")");
for (Enumeration e = children.elements() ; e.hasMoreElements() ;) {
DelegatedClassLoader ldr = (DelegatedClassLoader)e.nextElement();
if (ldr != null) {
try {
cl = ldr.delegatedFindClass(name);
if (cl != null) {
System.out.println(" - found delegated answer "+cl+" from "+ldr);
return cl;
}
} catch (Exception ex) {}
}
}
return super.findClass(name);
}
public URL findResource(String name) {
URL u = null;
System.out.println("boot findResource(\""+name+"\")");
for (Enumeration e = children.elements() ; e.hasMoreElements() ;) {
DelegatedClassLoader ldr = (DelegatedClassLoader)e.nextElement();
if (ldr != null) {
try {
u = ldr.delegatedFindResource(name);
if (u != null) {
System.out.println(" - found delegated answer "+u+" from "+ldr);
return u;
}
} catch (Exception ex) {}
}
}
return super.findResource(name);
}
}
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