ucar.unidata.util

Class PluginClassLoader

java.lang.Object

java.lang.ClassLoader

ucar.unidata.util.PluginClassLoader

public class PluginClassLoader
extends java.lang.ClassLoader

Class PluginClassLoader. Loads plugin classes

Version:

$Revision: 1.54 $

Author:

IDV Development Team

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	PLUGIN_PROTOCOL for url plugins

Constructor Summary

Constructors

Constructor and Description
PluginClassLoader(java.lang.String jarFilePath, java.lang.ClassLoader parent) ctor

Method Summary

Modifier and Type	Method and Description
protected void	checkClass(java.lang.Class c)
void	closeJar() Close the jar file
protected java.lang.String	defineResource(java.util.jar.JarEntry jarEntry) Associate the resource name with the jar entry
java.lang.Class	getClassFromPlugin(java.lang.String name) Check if this class is one we loaded from a plugin
java.util.List	getEntryNames() Get the list of (String) names of the non-class files in the jar
java.net.URL	getResource(java.lang.String resource) Open the resource as a URL
java.io.InputStream	getResourceAsStream(java.lang.String resource) Open the resource as a istream if we have it
protected void	handleError(java.lang.String msg, java.lang.Throwable exc)
java.lang.Class	loadClass(java.lang.String name) Overwrite base class method to load in a class by name
java.lang.String	toString()

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findResources, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, 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

Field Detail

PLUGIN_PROTOCOL

public static final java.lang.String PLUGIN_PROTOCOL

for url plugins

See Also:

Constant Field Values

Constructor Detail

PluginClassLoader

public PluginClassLoader(java.lang.String jarFilePath,
                         java.lang.ClassLoader parent)
                  throws java.io.IOException

ctor

Parameters:

jarFilePath - Where the jar file is

parent - parent

Throws:

java.io.IOException - On badness

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

handleError

protected void handleError(java.lang.String msg,
                           java.lang.Throwable exc)

closeJar

public void closeJar()

Close the jar file

getEntryNames

public java.util.List getEntryNames()

Get the list of (String) names of the non-class files in the jar

Returns:

List of jar entries

checkClass

protected void checkClass(java.lang.Class c)
                   throws java.lang.Exception

Throws:

java.lang.Exception

loadClass

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

Overwrite base class method to load in a class by name

Overrides:

loadClass in class java.lang.ClassLoader

Parameters:

name - class name

Returns:

The class

Throws:

java.lang.ClassNotFoundException - On badness

getClassFromPlugin

public java.lang.Class getClassFromPlugin(java.lang.String name)

Check if this class is one we loaded from a plugin

Returns:

the class or null

defineResource

protected java.lang.String defineResource(java.util.jar.JarEntry jarEntry)

Associate the resource name with the jar entry

Parameters:

jarEntry - THe entry

getResource

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

Open the resource as a URL

Overrides:

getResource in class java.lang.ClassLoader

Parameters:

resource - The resource

Returns:

The URL

getResourceAsStream

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

Open the resource as a istream if we have it

Overrides:

getResourceAsStream in class java.lang.ClassLoader

Parameters:

resource - The resource

Returns:

The istream