ucar.unidata.util
Class PluginClassLoader

java.lang.Object
  java.lang.ClassLoader
      ucar.unidata.util.PluginClassLoader

public class PluginClassLoader
extends ClassLoader

Class PluginClassLoader. Loads plugin classes

Version:

$Revision: 1.54 $

Author:

IDV Development Team

Field Summary

static String

PLUGIN_PROTOCOL for url plugins

Constructor Summary

PluginClassLoader(String jarFilePath, ClassLoader parent)
ctor

Method Summary

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

Methods inherited from class java.lang.ClassLoader

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

for url plugins

See Also:

Constant Field Values

Constructor Detail

PluginClassLoader

public PluginClassLoader(String jarFilePath,
                         ClassLoader parent)
                  throws IOException

ctor

Parameters:

jarFilePath - Where the jar file is

parent - parent

Throws:

IOException - On badness

Method Detail

toString

public String toString()

Overrides:

toString in class Object

handleError

protected void handleError(String msg,
                           Throwable exc)

closeJar

public void closeJar()

Close the jar file

getEntryNames

public 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(Class c)
                   throws Exception

Throws:

Exception

loadClass

public Class loadClass(String name)
                throws ClassNotFoundException

Overwrite base class method to load in a class by name

Overrides:

loadClass in class ClassLoader

Parameters:

name - class name

Returns:

The class

Throws:

ClassNotFoundException - On badness

getClassFromPlugin

public Class getClassFromPlugin(String name)

Check if this class is one we loaded from a plugin

Returns:

the class or null

defineResource

protected String defineResource(JarEntry jarEntry)

Associate the resource name with the jar entry

Parameters:

jarEntry - THe entry

getResource

public URL getResource(String resource)

Open the resource as a URL

Overrides:

getResource in class ClassLoader

Parameters:

resource - The resource

Returns:

The URL

getResourceAsStream

public InputStream getResourceAsStream(String resource)

Open the resource as a istream if we have it

Overrides:

getResourceAsStream in class ClassLoader

Parameters:

resource - The resource

Returns:

The istream