abbot.util

Class NonDelegatingClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

abbot.util.PathClassLoader

abbot.util.NonDelegatingClassLoader

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

Direct Known Subclasses:

AppClassLoader

public class NonDelegatingClassLoader
extends PathClassLoader

Provides support for loading a class before checking the parent class loader for it. If the shouldDelegate method returns false for a given class name, it will defer to its parent class loader only if the class is not found in this loader's path. This provides a means for reloading classes that would otherwise be permanently cached by the app or boot class loaders.

The name for this class is not quite correct; it will delegate to its parent if it doesn't find a given class.

Constructor Summary

Constructors

Constructor and Description
NonDelegatingClassLoader(java.lang.String path, java.lang.ClassLoader parent)

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.Class	findClass(java.lang.String name) Find the given class in the search path.
protected java.lang.Class	loadClass(java.lang.String name, boolean resolve) Load the given class, but attempt to load before the parent if shouldDelegate returns false for the given class.
protected boolean	shouldDelegate(java.lang.String name) Returns whether the given class should be given to the parent class loader to try before this one does.

Methods inherited from class abbot.util.PathClassLoader

convertPathToFilenames, convertPathToFilenames, convertPathToFiles, getClassPath, getURLs, toString

Methods inherited from class java.net.URLClassLoader

addURL, close, definePackage, 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, wait, wait, wait

Constructor Detail

NonDelegatingClassLoader

public NonDelegatingClassLoader(java.lang.String path,
                        java.lang.ClassLoader parent)

Method Detail

shouldDelegate

protected boolean shouldDelegate(java.lang.String name)

Returns whether the given class should be given to the parent class loader to try before this one does. The default implementation always returns false. Making this method return true will revert to the standard class loader behavior.

findClass

public java.lang.Class findClass(java.lang.String name)
                          throws java.lang.ClassNotFoundException

Find the given class in the search path.

Overrides:

findClass in class java.net.URLClassLoader

Throws:

java.lang.ClassNotFoundException

loadClass

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

Load the given class, but attempt to load before the parent if shouldDelegate returns false for the given class.

Overrides:

loadClass in class PathClassLoader

Throws:

java.lang.ClassNotFoundException