com.ibm.able.editor
Class AbleClassLoader

java.lang.Object
  java.lang.ClassLoader
      com.ibm.able.editor.AbleClassLoader

public class AbleClassLoader

extends java.lang.ClassLoader

A class loader that is used by the JarLoader to load the classes and resources.

Class instances are given an cookie string to identify their resources but our client code creates a single instance only. This is because it is impossible in general to pass values across from classes in one classloader to another.

This class loader can load from:

• the system classes/resources (CLASSPATH)
• JAR files
• specific files
• specific overrides for resources

Field Summary

static AbleClassLoader	ourLoader The only SimpleClassLoader we actually instantiate
static java.lang.String	urlPrefix

Method Summary

boolean	applyDefinitions(java.util.Vector classList) Define a class from the bytecodes that were collected early...
static AbleClassLoader	createLoader(java.lang.String cookie, java.lang.String dir) Returns an InputStream on the resource
void	defineClassFromBytes(java.lang.String name, byte[] buf) Set some bytecodes as a definition for a class.
java.net.URL	getLocalResource(java.lang.String name) Return a URL to the desired resource.
static java.lang.Object	getLocalResource(java.lang.String cookie, java.lang.String name) get the local resource object...
static java.io.InputStream	getLocalResourceAsStream(java.lang.String cookie, java.lang.String name)
java.net.URL	getResource(java.lang.String name)
java.io.InputStream	getResourceAsStream(java.lang.String name)
java.lang.Object	instantiate(java.lang.String name, AbleInputStreamProducer isp) Interface to Beans.instantiate.
java.lang.Class	loadClass(java.lang.String name) Load a class from this class loader.
protected java.lang.Class	loadClass(java.lang.String name, boolean resolve) This is the main method for ClassLoaders, that is being redefined
java.lang.Class	loadClassFromFile(java.lang.String fileName) Helper function; load a class from a file
void	setLocalResourceSource(java.lang.String name, AbleInputStreamProducer isp) Assign an InputStream as the source for a given property name This value comes first after the system resources

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findResources, findSystemClass, getPackage, getPackages, getParent, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, 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

urlPrefix

public static final java.lang.String urlPrefix

See Also:

Constant Field Values

ourLoader

public static AbleClassLoader ourLoader

The only SimpleClassLoader we actually instantiate

Method Detail

defineClassFromBytes

public void defineClassFromBytes(java.lang.String name,
                                 byte[] buf)

Set some bytecodes as a definition for a class. Do not actually define the class until later

loadClassFromFile

public java.lang.Class loadClassFromFile(java.lang.String fileName)
                                  throws java.lang.ClassNotFoundException

Helper function; load a class from a file

Throws:

java.lang.ClassNotFoundException - if class cannot be found

loadClass

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

Load a class from this class loader.

Throws:

java.lang.ClassNotFoundException - if the class could not be found.

loadClass

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

This is the main method for ClassLoaders, that is being redefined

Throws:

java.lang.ClassNotFoundException - if the class could not be found.

instantiate

public java.lang.Object instantiate(java.lang.String name,
                                    AbleInputStreamProducer isp)
                             throws java.lang.ClassNotFoundException,
                                    java.io.IOException

Interface to Beans.instantiate. Name is that of the bean. The stream producer provides the serialized representation of the bean

Throws:

java.lang.ClassNotFoundException - if class file not found

java.io.IOException

setLocalResourceSource

public void setLocalResourceSource(java.lang.String name,
                                   AbleInputStreamProducer isp)

Assign an InputStream as the source for a given property name This value comes first after the system resources

getResource

public java.net.URL getResource(java.lang.String name)

getResourceAsStream

public java.io.InputStream getResourceAsStream(java.lang.String name)

getLocalResource

public java.net.URL getLocalResource(java.lang.String name)

Return a URL to the desired resource.

createLoader

public static AbleClassLoader createLoader(java.lang.String cookie,
                                           java.lang.String dir)

Returns an InputStream on the resource

getLocalResource

public static java.lang.Object getLocalResource(java.lang.String cookie,
                                                java.lang.String name)

get the local resource object...

getLocalResourceAsStream

public static java.io.InputStream getLocalResourceAsStream(java.lang.String cookie,
                                                           java.lang.String name)

applyDefinitions

public boolean applyDefinitions(java.util.Vector classList)

Define a class from the bytecodes that were collected early... Will return false if there were problems applying the definitions This is only invoked if we are defining classes up front. Code will be removed if we don't discover any problems in testing.