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)?"":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); } }