gate.util
Class ReloadingClassLoader

java.lang.Object
  java.lang.ClassLoader
      gate.util.ReloadingClassLoader

public class ReloadingClassLoader
extends ClassLoader

Nested Class Summary

protected class

ReloadingClassLoader.LocationClassLoader A ClassLoader that loads classes from a location specified by an URL.

Field Summary

protected Map	loaders Map that contains the ReloadingClassLoader.LocationClassLoader for each registered URL.
protected ClassLoader	parent The parent class loader.

Constructor Summary

ReloadingClassLoader()
Constructs a ReloadingClassLoader using the System Class Loader as a parent.

ReloadingClassLoader(ClassLoader parent)
Constructs a ReloadingClassLoader using a custom class loader as parent.

Method Summary

void	load(URL url) Registers an URL as a location where class files can be found.
protected Class	loadClass(String name, boolean resolve) Loads the class with the specified name.
void	unload(URL url) Removes a registered URL.

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findResources, findSystemClass, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

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

Field Detail

loaders

protected Map loaders

Map that contains the ReloadingClassLoader.LocationClassLoader for each registered URL.

parent

protected ClassLoader parent

The parent class loader.

Constructor Detail

ReloadingClassLoader

public ReloadingClassLoader(ClassLoader parent)

Constructs a ReloadingClassLoader using a custom class loader as parent.

Parameters:

parent - the parent class loader. The parent class loader should give access to the system classes at the least (in order to load a new class access to Object is required).

ReloadingClassLoader

public ReloadingClassLoader()

Constructs a ReloadingClassLoader using the System Class Loader as a parent.

Method Detail

load

public void load(URL url)

Registers an URL as a location where class files can be found. If the URL was already registered the the classes found at the location will be reloaded.

Parameters:

url - the URL pointing to a jar file or to a directory containing class files.

unload

public void unload(URL url)

Removes a registered URL.

Parameters:

url - the URl to be unloaded.

loadClass

protected Class loadClass(String name,
                          boolean resolve)
                   throws ClassNotFoundException

Loads the class with the specified name. It searches for classes in the following order:

1. the parent classloader
2. all the locations registered with this class loader

Overrides:

loadClass in class ClassLoader

Parameters:

name - The name of the class

resolve - If true then resolve the class

Returns:

The resulting Class object

Throws:

ClassNotFoundException - If the class could not be found