Attempts to list all the classes in the specified package as determined by the context class loader...
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLDecoder;
import java.security.CodeSource;
import java.security.ProtectionDomain;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
public class FileUtils {
static int BUFFER_SIZE = 10*1024;
/**
* Attempts to list all the classes in the specified package as determined
* by the context class loader...
*
* @param pckgname
* the package name to search
* @return a list of classes that exist within that package
* @throws ClassNotFoundException
* if something went wrong
*/
public static List<Class<?>> getClassesInSamePackage(Class<?>... classes) throws ClassNotFoundException {
ArrayList<Class<?>> result = new ArrayList<Class<?>>();
if(classes == null || classes.length == 0)
return result;
// This will hold a list of directories matching the pckgname. There may be more than one if
// a package is split over multiple jars/paths
ArrayList<File> directories = new ArrayList<File>();
HashMap<File,String> packageNames = null;
String pckgname = null;
try {
ClassLoader cld = Thread.currentThread().getContextClassLoader();
if (cld == null) {
throw new ClassNotFoundException("Can't get class loader.");
}
for(Class<?> clazz: classes) {
// TODO: this would not work in a non OSGi environment
String syspath = getBundlePath(clazz);
if(syspath.endsWith("/")) {
syspath = syspath.substring(0, syspath.length()-1);
} else if(syspath.endsWith(".jar")) {
getClassesInSamePackageFromJar(result, classes, syspath);
continue;
}
pckgname = clazz.getPackage().getName();
String path = pckgname.replace('.', '/');
// Ask for all resources for the path
Enumeration<URL> resources = cld.getResources(path);
File directory = null;
while (resources.hasMoreElements()) {
String path2 = resources.nextElement().getPath();
if (!path2.contains(syspath)) {
// needed to get it working on Eclipse 3.5
if(syspath.indexOf("/bin")<1) {
syspath = syspath + "/bin";
}
directory = new File(URLDecoder.decode(syspath+path2, "UTF-8"));
} else
directory = new File(URLDecoder.decode(path2, "UTF-8"));
directories.add(directory);
}
if (packageNames == null)
packageNames = new HashMap<File, String>();
packageNames.put(directory,pckgname);
}
} catch (NullPointerException x) {
throw new ClassNotFoundException(pckgname + " does not appear to be a valid package (Null pointer exception)");
} catch (UnsupportedEncodingException encex) {
throw new ClassNotFoundException(pckgname + " does not appear to be a valid package (Unsupported encoding)");
} catch (IOException ioex) {
throw new ClassNotFoundException("IOException was thrown when trying to get all resources for " + pckgname);
}
// For every directory identified capture all the .class files
for (File directory : directories) {
if (directory.exists()) {
// Get the list of the files contained in the package
String[] files = directory.list();
for (String file : files) {
System.out.println(file);
// we are only interested in .class files
if (file.endsWith(".class")) {
try {
// removes the .class extension
result.add(Class.forName(packageNames.get(directory) + '.' + file.substring(0, file.length() - 6)));
} catch (Throwable e) {
// ignore exception and continue
}
}
}
} else {
throw new ClassNotFoundException(pckgname + " (" + directory.getPath() + ") does not appear to be a valid package");
}
}
return result;
}
/**
* Returns the list of classes in the same directories as Classes in <code>classes</code>.
*
* @param result
* @param classes
* @param jarPath
*/
private static void getClassesInSamePackageFromJar(List<Class<?>> result, Class<?>[] classes, String jarPath) {
JarFile jarFile = null;
try {
jarFile = new JarFile(jarPath);
//ClassLoader cld = Thread.currentThread().getContextClassLoader();
Enumeration<JarEntry> en = jarFile.entries();
while(en.hasMoreElements()) {
JarEntry entry = en.nextElement();
String entryName = entry.getName();
for(Class<?> clazz: classes) {
String packageName = clazz.getPackage().getName().replace('.', '/');
if(entryName != null && entryName.endsWith(".class") && entryName.startsWith(packageName)) {
try {
Class<?> entryClass = Class.forName(entryName.substring(0,entryName.length()-6).replace('/', '.'));
if(entryClass != null)
result.add(entryClass);
} catch (Throwable e) {
// do nothing, just continue processing classes
}
}
}
}
} catch (Exception e) {
result.addAll(Arrays.asList(classes));
} finally {
try {
if(jarFile != null)
jarFile.close();
} catch (Exception e) {
}
}
}
/**
* Returns the location of the
*
* @param clazz
* @return
*/
public static String getBundlePath(Class<?> clazz) {
ProtectionDomain pd = clazz.getProtectionDomain();
if (pd == null)
return null;
CodeSource cs = pd.getCodeSource();
if (cs == null)
return null;
URL url = cs.getLocation();
if (url == null)
return null;
String result = url.getFile();
return result;
}
}