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package com.e1.pdj;
import java.net.URLClassLoader;
import java.net.*;
import java.util.*;
import java.io.*;
import com.cycling74.max.MaxSystem;
public class PDJClassLoader extends URLClassLoader {
/** The folder where the class (and java files) are */
static File fclasses;
/** if this is set to true, all classloader operation will be logged */
static boolean verboseCL = false;
static private PDJClassLoader instance;
static {
String prop = System.getProperty("pdj.classes-dir");
if ( prop == null ) {
fclasses = new File(System.getProperty("pdj.home") + "/classes");
} else {
fclasses = new File(prop);
}
instance = new PDJClassLoader();
verboseCL = PDJSystem.isSystemPropertyTrue("pdj.verbose-classloader");
}
static public PDJClassLoader getInstance() {
return instance;
}
public PDJClassLoader() {
super(resolvClasspath());
}
private static void findJars(File f, Collection v) throws MalformedURLException {
File files[] = f.listFiles();
for(int i = 0;i<files.length;i++) {
String filename = files[i].toString();
if ( filename.endsWith(".jar") || filename.endsWith(".zip") ) {
v.add(new URL("jar:" + files[i].toURL().toString() + "!/"));
}
}
}
private static URL[] resolvClasspath() {
String cp = System.getProperty("pdj.classpath");
ArrayList list = new ArrayList();
String pathSeparator = "" + File.pathSeparator;
try {
if ( fclasses.isDirectory() )
list.add(fclasses.toURL());
File lib = new File(System.getProperty("pdj.home") + "/lib");
if ( lib.isDirectory() )
findJars(lib, list);
StringTokenizer st = new StringTokenizer(cp, pathSeparator);
while( st.hasMoreTokens() ) {
String token = st.nextToken(pathSeparator);
File f = new File(token);
if ( f.isFile() && (f.toString().endsWith(".jar") || f.toString().endsWith(".zip")) )
list.add(new URL("jar:" + f.toURL().toString() + "!/"));
if ( f.isDirectory() ) {
findJars(f, list);
list.add(f.toURL());
}
}
} catch ( MalformedURLException mue ) {
throw new Error("pdj: unable to add to classpath: " + mue);
}
URL ret[] = (URL[]) list.toArray(new URL[list.size()]);
if ( verboseCL ) {
MaxSystem.post("pdj: verbose classloader: system classpath: " + System.getProperty("java.class.path"));
MaxSystem.post("pdj: verbose classloader: dynamic classpath:");
for(int i=0;i<ret.length;i++) {
MaxSystem.post("\t" + ret[i].toString());
}
}
return ret;
}
public static String[] getCurrentClassPath() {
URL url[] = instance.getURLs();
String ret[] = new String[url.length];
for(int i=0;i<url.length;i++) {
ret[i] = url[i].toString();
}
return ret;
}
public static String getReadableClassPath() {
PDJClassLoader cloader = getInstance();
StringBuffer sb = new StringBuffer();
URL url[] = cloader.getURLs();
for(int i=0;i<url.length;i++) {
sb.append("\t" + url[i].toString() + "\n");
}
return sb.toString();
}
/**
* Returns a readable classpath for javac
* @return the classpath for javac / jikes
*/
public static String getConfigurationClassPath() {
StringBuffer sb = new StringBuffer();
sb.append(System.getProperty("java.class.path") + File.pathSeparatorChar);
URL url[] = getInstance().getURLs();
for(int i=0;i<url.length;i++) {
String path = url[i].toString();
if ( path.startsWith("file:") ) {
sb.append(path.substring(6) + File.pathSeparatorChar);
continue;
}
if ( path.startsWith("jar:") ) {
sb.append(path.substring(10, path.lastIndexOf("!")) + File.pathSeparatorChar);
continue;
}
sb.append(path + File.pathSeparatorChar);
}
return sb.toString();
}
public static void resetClassloader() {
instance = new PDJClassLoader();
System.gc();
}
/**
* Dynamic resolv will try to load .java file from date with .class
* @param name classname
* @return class definition
* @throws ClassNotFoundException
*/
public static Class dynamicResolv(String name) throws PDJClassLoaderException {
if ( System.getProperty("pdj.compiler").equals("null") ) {
resetClassloader();
try {
return instance.loadClass(name);
} catch (ClassNotFoundException e) {
throw new PDJClassLoaderException(e);
}
}
String pathName = name.replace('.', File.pathSeparatorChar);
File classFile = new File(fclasses, pathName + ".class");
File javaFile = new File(fclasses, pathName + ".java");
if ( javaFile.exists() ) {
if ( classFile.exists() ) {
if ( javaFile.lastModified() > classFile.lastModified() ) {
compileClass(javaFile);
} else {
if ( verboseCL )
MaxSystem.post("class: " + name + " is already compiled and younger than the source .java file");
}
} else {
compileClass(javaFile);
}
}
resetClassloader();
try {
return instance.loadClass(name);
} catch (ClassNotFoundException e) {
throw new PDJClassLoaderException(e);
}
}
protected static void compileClass(File javaFile) throws PDJClassLoaderException {
String str_compiler = System.getProperty("pdj.compiler");
GenericCompiler compiler = null;
if ( str_compiler.equals("jikes") ) {
compiler = new JikesCompiler();
} else {
if ( !str_compiler.equals("javac") ) {
System.err.println("pdj: unknown compiler:" + str_compiler + ", using javac.");
}
compiler = new JavacCompiler();
}
compiler.javaFile = javaFile;
compiler.compileClass();
}
}
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