ij.io
Class PluginClassLoader

java.lang.Object
  java.lang.ClassLoader
      java.security.SecureClassLoader
          java.net.URLClassLoader
              ij.io.PluginClassLoader

public class PluginClassLoader
extends java.net.URLClassLoader

ImageJ uses this class loader to load plugins and resources from the plugins directory and immediate subdirectories. This class loader will also load classes and resources from JAR files.

The class loader searches for classes and resources in the following order:

1. Plugins directory
2. Subdirectories of the Plugins directory
3. JAR and ZIP files in the plugins directory and subdirectories

The class loader does not recurse into subdirectories beyond the first level.

Field Summary

protected java.lang.String

path

Constructor Summary

PluginClassLoader(java.lang.String path)
Creates a new PluginClassLoader that searches in the directory path passed as a parameter.

PluginClassLoader(java.lang.String path, boolean callSuper)
This version of the constructor is used when ImageJ is launched using Java WebStart.

Method Summary

Methods inherited from class java.net.URLClassLoader

addURL, definePackage, findClass, findResource, findResources, getPermissions, getURLs, newInstance, newInstance

Methods inherited from class java.security.SecureClassLoader

defineClass, defineClass

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, 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

Field Detail

path

protected java.lang.String path

Constructor Detail

PluginClassLoader

public PluginClassLoader(java.lang.String path)

Creates a new PluginClassLoader that searches in the directory path passed as a parameter. The constructor automatically finds all JAR and ZIP files in the path and first level of subdirectories. The JAR and ZIP files are stored in a Vector for future searches.

Parameters:

path - the path to the plugins directory.

PluginClassLoader

public PluginClassLoader(java.lang.String path,
                         boolean callSuper)

This version of the constructor is used when ImageJ is launched using Java WebStart.