org.openorb.util.launcher
Class LibraryClassLoader

java.lang.Object
  |
  +--java.lang.ClassLoader
        |
        +--java.security.SecureClassLoader
              |
              +--java.net.URLClassLoader
                    |
                    +--org.openorb.util.launcher.LibraryClassLoader

Direct Known Subclasses:

ProjectClassLoader

public class LibraryClassLoader

extends URLClassLoader

A generic class loader using directory scans to add libraries to th class path.

Version:

$Revision: 1.5 $ $Date: 2004/02/03 23:25:32 $

Author:

Richard G Clark

Inner Class Summary

static class

LibraryClassLoader.PostfixFileFilter A FileFilter that accepts files with a specified postfix.

Field Summary

static FileFilter	ACCEPT_ALL_FILE_FILTER A FileFilter that accepts any file.
static FileFilter	JAR_FILE_FILTER A FileFilter that accepts any file with.
static FileFilter	REJECT_ALL_FILE_FILTER A FileFilter that accepts no file.

Constructor Summary

LibraryClassLoader(File[] roots, ClassLoader parent, FileFilter libraryFilter, FileFilter recursiveFilter, boolean dynamicRescan)
Constructs this to search the specified roots for libraries matching the filter.

LibraryClassLoader(File[] roots, FileFilter libraryFilter, FileFilter recursiveFilter, boolean dynamicRescan)
Constructs this to search the specified roots for libraries matching the filter.

Method Summary

protected Class

findClass(String className) Finds the specified class.

Methods inherited from class java.net.URLClassLoader

addURL, definePackage, findResource, findResources, getPermissions, getURLs, newInstance, newInstance

Methods inherited from class java.security.SecureClassLoader

defineClass

Methods inherited from class java.lang.ClassLoader

defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, loadClass, resolveClass, setSigners

Methods inherited from class java.lang.Object

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

Field Detail

ACCEPT_ALL_FILE_FILTER

public static final FileFilter ACCEPT_ALL_FILE_FILTER

A FileFilter that accepts any file.

REJECT_ALL_FILE_FILTER

public static final FileFilter REJECT_ALL_FILE_FILTER

A FileFilter that accepts no file.

JAR_FILE_FILTER

public static final FileFilter JAR_FILE_FILTER

A FileFilter that accepts any file with.

Constructor Detail

LibraryClassLoader

public LibraryClassLoader(File[] roots,
                          FileFilter libraryFilter,
                          FileFilter recursiveFilter,
                          boolean dynamicRescan)

Constructs this to search the specified roots for libraries matching the filter.

Parameters:

roots - the root files to search

libraryFilter - used to identify library files

recursiveFilter - used to determine which directories to recursively traverse

dynamicRescan - indicates if the roots should be rescanned if a class could not be found

LibraryClassLoader

public LibraryClassLoader(File[] roots,
                          ClassLoader parent,
                          FileFilter libraryFilter,
                          FileFilter recursiveFilter,
                          boolean dynamicRescan)

Constructs this to search the specified roots for libraries matching the filter.

Parameters:

roots - the root files to search

parent - the parent class loader to use

libraryFilter - used to identify library files

recursiveFilter - used to determine which directories to recursively traverse

dynamicRescan - indicates if the roots should be rescanned if a class could not be found

Method Detail

findClass

protected Class findClass(String className)
                   throws ClassNotFoundException

Finds the specified class. If dynamic scanning is enabled then the roots will be rescanned before throwing an exception.

Overrides:

findClass in class URLClassLoader

Parameters:

className - the name of the class

Returns:

the resulting Class object

Throws:

ClassNotFoundException - if the class could not be found