stanford.cs106.reflect

Class ClassUtils.BetterClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

stanford.cs106.reflect.ClassUtils.BetterClassLoader

All Implemented Interfaces:

Closeable, AutoCloseable

Enclosing class:

ClassUtils

public static class ClassUtils.BetterClassLoader
extends URLClassLoader

Loads classes from files on the server's hard disk. I shouldn't need to write this class, but Java's built-in class loaders (particularly URLClassLoader) are actually quite shitty. You have to pass them arrays of java.net.URL objects, and they throw a million exceptions, and they don't really work very well. So I have to make my own wrapper. Sigh.

Method Summary

Modifier and Type	Method and Description
Class<?>	loadClass(String name) Tries to load the class from the default system class loader, but if it isn't found, loads from the internal list of URLs.
static ClassLoader	newInstance(ClassLoader parent, String... filenames) Creates a new loader that loads classes from the given array of file names.
static ClassLoader	newInstance(String... filenames) Creates a new loader that loads classes from the given array of file names.

Methods inherited from class java.net.URLClassLoader

addURL, close, definePackage, findClass, findResource, findResources, getPermissions, getResourceAsStream, getURLs, newInstance, newInstance

Methods inherited from class java.security.SecureClassLoader

defineClass, defineClass

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, getResource, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, registerAsParallelCapable, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

newInstance

public static ClassLoader newInstance(String... filenames)

Creates a new loader that loads classes from the given array of file names. If a class can't be found in any of those files, falls back to the system class loader.

newInstance

public static ClassLoader newInstance(ClassLoader parent,
                                      String... filenames)

Creates a new loader that loads classes from the given array of file names. If a class can't be found in any of those files, falls back to the given "parent" class loader.

loadClass

public Class<?> loadClass(String name)
                   throws ClassNotFoundException

Tries to load the class from the default system class loader, but if it isn't found, loads from the internal list of URLs. The main exception is that classes from the 'Sandbox' package are forcibly loaded from Practice-It's own notions of the sandbox.* classes. JUnit classes are also treated as a special case. This is to make it so that dynamically loaded DumpingGround classes can see sandbox.* classes that they interact with.

Overrides:

loadClass in class ClassLoader

Throws:

ClassNotFoundException