com.ibm.di.loader
Class IDILoader

java.lang.Object
  java.lang.ClassLoader
      com.ibm.di.loader.IDILoader

public class IDILoader
extends ClassLoader

This class is responsible for loading classes from the jar files that are placed in the jars directory

Constructor Summary

IDILoader()
Constructor for the IDILoader object

Method Summary

void	addFiles(String path) Add all files in the given path to our internal list of jar files
void	addInstalledComponent(String path) Locate idi.inf in a jar file, and add it to the sysconfig String
void	addPackages(File path) Add all files in the given path to our internal list of packages
void	cacheJarContents(String path) Locate all classes in a jar file, and add the names to a local cache.
protected Class	findClass(String name) Finds the specified class
protected String	findLibrary(String name) Returns the absolute path name of a native library.
protected URL	findResource(String name) Finds the resource with the given name.
static List	getInstalledPackages() Returns the list of installed packages
static String	getModificationDate(String className) Returns the time a class was modified
String	getPathForClass(String clsname) Returns the path from which a class is/will be loaded.
static String	getSysConfig() Returns the accumulated sysConfig ( concatenation of all the idi.inf files ).
Class	loadClassFromFile(String fileName)
static void	main(String[] args) The main program for the IDILoader class
void	run(String name, String[] args) Main processing method for the IDILoader object.

Methods inherited from class java.lang.ClassLoader

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

Methods inherited from class java.lang.Object

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

Constructor Detail

IDILoader

public IDILoader()

Constructor for the IDILoader object

Method Detail

getSysConfig

public static String getSysConfig()

Returns the accumulated sysConfig ( concatenation of all the idi.inf files ).

Returns:

The sysConfig value

getModificationDate

public static String getModificationDate(String className)

Returns the time a class was modified

Parameters:

className - the name of the class

Returns:

The modification time as a String or null if not found

getInstalledPackages

public static List getInstalledPackages()

Returns the list of installed packages

getPathForClass

public String getPathForClass(String clsname)

Returns the path from which a class is/will be loaded.

main

public static void main(String[] args)

The main program for the IDILoader class

Parameters:

args - The command line arguments

addFiles

public void addFiles(String path)

Add all files in the given path to our internal list of jar files

Parameters:

path - The path of the file(s) to be added

addPackages

public void addPackages(File path)

Add all files in the given path to our internal list of packages

Parameters:

path - The path of the file(s) to be added

addInstalledComponent

public void addInstalledComponent(String path)

Locate idi.inf in a jar file, and add it to the sysconfig String

Parameters:

path - The absolute path of the jar file

cacheJarContents

public void cacheJarContents(String path)

Locate all classes in a jar file, and add the names to a local cache. This cache contains a mapping from class name to path name.

Parameters:

path - The absolute path of the jar file

run

public void run(String name,
                String[] args)

Main processing method for the IDILoader object. Build internal structures, load the named class, and call the main method of that class, passing the arguments

Parameters:

name - The class to load and call the main method in. If name == null, only build internal structures

args - Parameters to pass to the main method in the named class

findClass

protected Class findClass(String name)
                   throws ClassNotFoundException

Finds the specified class

Overrides:

findClass in class ClassLoader

Parameters:

name - The name of the class

Returns:

The resulting Class object

Throws:

ClassNotFoundException - If the class could not be found

findResource

protected URL findResource(String name)

Finds the resource with the given name.

Overrides:

findResource in class ClassLoader

Parameters:

name - The resource name

Returns:

A URL object for reading the resource, or null if the resource could not be found

findLibrary

protected String findLibrary(String name)

Returns the absolute path name of a native library.

Overrides:

findLibrary in class ClassLoader

Parameters:

name - The library name

Returns:

The absolute path of the native library

loadClassFromFile

public Class loadClassFromFile(String fileName)
                        throws Exception

Throws:

Exception