com.ibm.di.loader
Class IDILoader

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

public class IDILoader
extends java.lang.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(java.lang.String path) Add all files in the given path to our internal list of jar files
void	addInstalledComponent(java.lang.String path) Locate idi.inf in a jar file, and add it to the sysconfig String
void	addInstalledXMLComponent(java.lang.String path) Locate tdi.xml in a jar file, and add it to the sysconfigs Vector
void	addPackages(java.io.File path) Add all files in the given path to our internal list of packages
void	cacheJarContents(java.lang.String path) Locate all classes in a jar file, and add the names to a local cache.
protected java.lang.Class<?>	findClass(java.lang.String name) Finds the specified class
protected java.lang.String	findLibrary(java.lang.String name) Returns the absolute path name of a native library.
protected java.net.URL	findResource(java.lang.String name) Finds the resource with the given name.
protected java.util.Enumeration<java.net.URL>	findResources(java.lang.String name) Returns an Enumeration of URLs representing all the resources with the given name.
static java.util.Vector<java.lang.String>	getAllSysConfigs() Returns a Vector with all the idi.inf files.
static java.util.List<java.lang.String>	getInstalledPackages()
static IDILoader	getInstance()
static java.lang.String	getModificationDate(java.lang.String className) Returns the time a class was modified
java.lang.String	getPathForClass(java.lang.String clsname)
static java.lang.String	getSysConfig() Returns the accumulated sysConfig ( concatenation of all the idi.inf files ).
java.lang.Class<?>	loadClassFromFile(java.lang.String fileName) Load a Class from a .class file Try to avoid duplicate defining of classes by keeping a local cache, which maps from fileName to class.
java.lang.Class<?>	loadClassFromFile(java.lang.String path, java.lang.String className) Locate all classes in a jar file, and define the classes found.
static void	main(java.lang.String[] args) The main program for the IDILoader class
void	run(java.lang.String name, java.lang.String[] args) Main processing method for the IDILoader object.

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLoadedClass, 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 java.lang.String getSysConfig()

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

Returns:

The sysConfig value

getAllSysConfigs

public static java.util.Vector<java.lang.String> getAllSysConfigs()

Returns a Vector with all the idi.inf files.

Returns:

Vector containing Strings, each String is the URL for an idi.inf file.

Since:

7.0

getModificationDate

public static java.lang.String getModificationDate(java.lang.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 java.util.List<java.lang.String> getInstalledPackages()

Returns:

the list of installed packages

getPathForClass

public java.lang.String getPathForClass(java.lang.String clsname)

Parameters:

clsname - the name of the class which path to get

Returns:

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

main

public static void main(java.lang.String[] args)

The main program for the IDILoader class

Parameters:

args - The command line arguments

addFiles

public void addFiles(java.lang.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(java.io.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(java.lang.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

addInstalledXMLComponent

public void addInstalledXMLComponent(java.lang.String path)

Locate tdi.xml in a jar file, and add it to the sysconfigs Vector

Parameters:

path - The absolute path of the jar file

cacheJarContents

public void cacheJarContents(java.lang.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(java.lang.String name,
                java.lang.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 java.lang.Class<?> findClass(java.lang.String name)
                                throws java.lang.ClassNotFoundException

Finds the specified class

Overrides:

findClass in class java.lang.ClassLoader

Parameters:

name - The name of the class

Returns:

The resulting Class object

Throws:

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

findResource

protected java.net.URL findResource(java.lang.String name)

Finds the resource with the given name.

Overrides:

findResource in class java.lang.ClassLoader

Parameters:

name - The resource name

Returns:

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

findResources

protected java.util.Enumeration<java.net.URL> findResources(java.lang.String name)
                                                     throws java.io.IOException

Returns an Enumeration of URLs representing all the resources with the given name. Class loader implementations should override this method to specify where to load resources from.

Overrides:

findResources in class java.lang.ClassLoader

Parameters:

name - the resource name

Returns:

an Enumeration of URLs for the resources

Throws:

java.io.IOException - if I/O errors occur

findLibrary

protected java.lang.String findLibrary(java.lang.String name)

Returns the absolute path name of a native library.

Overrides:

findLibrary in class java.lang.ClassLoader

Parameters:

name - The library name

Returns:

The absolute path of the native library

loadClassFromFile

public java.lang.Class<?> loadClassFromFile(java.lang.String fileName)
                                     throws java.lang.Exception

Load a Class from a .class file Try to avoid duplicate defining of classes by keeping a local cache, which maps from fileName to class.

Parameters:

fileName - - The name of the .class file

Returns:

- The loaded class

Throws:

java.lang.Exception - if an internal error occurs.

getInstance

public static IDILoader getInstance()

Returns:

the first instance of IDILoader that was created.

Since:

7.0

loadClassFromFile

public java.lang.Class<?> loadClassFromFile(java.lang.String path,
                                            java.lang.String className)

Locate all classes in a jar file, and define the classes found.

Parameters:

path - The absolute path of the jar file