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package java.net;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.SecureClassLoader;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Vector;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;
import org.aspectj.weaver.loadtime.Aj;
public class URLClassLoader extends SecureClassLoader {
public final static boolean debug = false;
private List path = new LinkedList();
private Aj agent;
public URLClassLoader() {
super();
}
public URLClassLoader(ClassLoader parent) {
super(parent);
}
public URLClassLoader(URL[] urls) throws IOException {
this(urls,null,null);
}
public URLClassLoader(URL[] urls, ClassLoader parent, URLStreamHandlerFactory factory) throws IOException {
super(parent);
if (debug) System.err.println("> URLClassLoader.URLClassLoader() parent=" + parent);
for (int i = 0; i < urls.length; i++) {
Object pathElement;
URL url = urls[i];
if (debug) System.err.println("- URLClassLoader.URLClassLoader() url=" + url.getPath());
File file = new File(encode(url.getFile()));
if (debug) System.err.println("- URLClassLoader.URLClassLoader() file" + file);
if (file.isDirectory()) pathElement = file;
else if (file.exists() && file.getName().endsWith(".jar")) pathElement = new JarFile(file);
else throw new RuntimeException(file.getAbsolutePath().toString());
path.add(pathElement);
}
agent = new Aj();
if (debug) System.err.println("< URLClassLoader.URLClassLoader() path=" + path);
}
// public final static boolean debug = false;
//
// private List path = new LinkedList();
//// private com.bea.jvm.ClassPreProcessor agent;
// private Object agent;
// private Method preProcess;
// public JRockitClassLoader (URLClassLoader clone) throws Exception {
// /* Use extensions loader */
// super(clone.getParent());
//
// URL[] urls = clone.getURLs();
// for (int i = 0; i < urls.length; i++) {
// Object pathElement;
// URL url = urls[i];
// if (debug) System.err.println("JRockitClassLoader.JRockitClassLoader() url=" + url.getPath());
// File file = new File(encode(url.getFile()));
// if (debug) System.err.println("JRockitClassLoader.JRockitClassLoader() file" + file);
// if (file.isDirectory()) pathElement = file;
// else if (file.exists() && file.getName().endsWith(".jar")) pathElement = new JarFile(file);
// else throw new RuntimeException(file.getAbsolutePath().toString());
// path.add(pathElement);
// }
//
// Class agentClazz = Class.forName("org.aspectj.weaver.loadtime.JRockitAgent",false,this);
// Object obj = agentClazz.newInstance();
// if (debug) System.err.println("JRockitClassLoader.JRockitClassLoader() obj=" + obj);
// this.agent = obj;
// byte[] bytes = new byte[] {};
// Class[] parameterTypes = new Class[] { java.lang.ClassLoader.class, java.lang.String.class, bytes.getClass() };
// preProcess = agentClazz.getMethod("preProcess",parameterTypes);
// }
/* Get rid of escaped characters */
private String encode (String s) {
StringBuffer result = new StringBuffer();
int i = s.indexOf("%");
while (i != -1) {
result.append(s.substring(0,i));
String escaped = s.substring(i+1,i+3);
s = s.substring(i+3);
Integer value = Integer.valueOf(escaped,16);
result.append(new Character((char)value.intValue()));
i = s.indexOf("%");
}
result.append(s);
return result.toString();
}
protected Class findClass(String name) throws ClassNotFoundException {
if (debug) System.err.println("> URLClassLoader.findClass() name=" + name);
Class clazz = null;
try {
clazz = super.findClass(name);
}
catch (ClassNotFoundException ex) {
for (Iterator i = path.iterator(); clazz == null && i.hasNext();) {
byte[] classBytes = null;
try {
Object pathElement = i.next();
if (pathElement instanceof File) {
File dir = (File)pathElement;
String className = name.replace('.','/') + ".class";
File classFile = new File(dir,className);
if (debug) System.err.println("- URLClassLoader.findClass() classFile=" + classFile);
if (classFile.exists()) classBytes = loadClassFromFile(name,classFile);
}
else {
JarFile jar = (JarFile)pathElement;
String className = name.replace('.','/') + ".class";
ZipEntry entry = jar.getEntry(className);
if (entry != null) classBytes = loadBytesFromZipEntry(jar,entry);
}
if (classBytes != null) {
clazz = defineClass(name,classBytes);
}
}
catch (IOException ioException) {
ex.printStackTrace();
}
}
}
if (debug) System.err.println("< URLClassLoader.findClass() clazz=" + clazz);
if (clazz == null) throw new ClassNotFoundException(name);
return clazz;
}
protected URL findResource (String name) {
if (debug) System.err.println("> URLClassLoader.findResource() name=" + name);
URL url = null;
try {
Enumeration enu = findResources(name);
if (enu.hasMoreElements()) url = (URL)enu.nextElement();
}
catch (IOException ex) {
ex.printStackTrace();
}
if (debug) System.err.println("< URLClassLoader.findResource() url=" + url);
return url;
}
protected Enumeration findResources (String name) throws IOException {
if (debug) System.err.println("> URLClassLoader.findResources() name=" + name);
Vector urls = new Vector();
for (Iterator i = path.iterator(); i.hasNext();) {
Object pathElement = i.next();
if (pathElement instanceof File) {
File dir = (File)pathElement;
File resourceFile = new File(dir,name);
// if (debug) System.err.println("- URLClassLoader.findResources() file=" + resourceFile);
}
else {
JarFile jar = (JarFile)pathElement;
ZipEntry entry = jar.getEntry(name);
// if (debug) System.err.println("- URLClassLoader.findResources() entry=" + entry);
if (entry != null) {
if (debug) System.err.println("- URLClassLoader.findResources() jar=" + jar.getName());
final byte[] bytes = loadBytesFromZipEntry(jar,entry);
URLStreamHandler streamHandler = new URLStreamHandler() {
protected URLConnection openConnection(URL u) throws IOException {
URLConnection connection = new URLConnection(u) {
public void connect() throws IOException {
}
public InputStream getInputStream() throws IOException {
return new ByteArrayInputStream(bytes);
}
};
return connection;
}
};
URL url = new URL("file",null,0,jar.getName(),streamHandler);
urls.add(url);
}
}
}
Enumeration enu = urls.elements();
if (debug) System.err.println("< URLClassLoader.findResources() enu=" + enu);
return enu;
}
private Class defineClass (String name, byte[] bytes) {
if (debug) System.err.println("> URLClassLoader.defineClass() name=" + name);
// try {
if (agent != null) bytes = agent.preProcess(name,bytes,this);
// }
// catch (IllegalAccessException iae) {
// iae.printStackTrace();
// throw new ClassFormatError(iae.getMessage());
// }
// catch (InvocationTargetException ite) {
// ite.printStackTrace();
// throw new ClassFormatError(ite.getTargetException().getMessage());
// }
if (debug) System.err.println("< URLClassLoader.defineClass() name=" + name);
return super.defineClass(name,bytes,0,bytes.length);
}
private byte[] loadClassFromFile (String name, File file) throws IOException {
if (debug) System.err.println("> URLClassLoader.loadClassFromFile() file=" + file);
byte[] bytes;
bytes = new byte[(int)file.length()];
FileInputStream fis = null;
try {
fis = new FileInputStream(file);
bytes = readBytes(fis,bytes);
}
finally {
if (fis != null) fis.close();
}
if (debug) System.err.println("< URLClassLoader.loadClassFromFile() bytes=b[" + bytes.length + "]");
return bytes;
}
private byte[] loadBytesFromZipEntry (JarFile jar, ZipEntry entry) throws IOException {
if (debug) System.err.println("> URLClassLoader.loadBytesFromZipEntry() entry=" + entry);
byte[] bytes;
bytes = new byte[(int)entry.getSize()];
InputStream is = null;
try {
is = jar.getInputStream(entry);
bytes = readBytes(is,bytes);
}
finally {
if (is != null) is.close();
}
if (debug) System.err.println("< URLClassLoader.loadBytesFromZipEntry() bytes=b[" + bytes.length + "]");
return bytes;
}
private byte[] readBytes (InputStream is, byte[] bytes) throws IOException {
for (int offset = 0; offset < bytes.length;) {
int read = is.read(bytes,offset,bytes.length - offset);
offset += read;
}
return bytes;
}
}
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