/*
* @(#)file CompatibleClassLoaderRepositorySupport.java
* @(#)author Sun Microsystems, Inc.
* @(#)version 1.4
* @(#)lastedit 07/03/08
*
*
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package com.sun.jdmk;
// JMX import
import javax.management.ObjectName;
import javax.management.MBeanServer;
import javax.management.InstanceNotFoundException;
import javax.management.loading.ClassLoaderRepository;
/**
* This class wraps a MBeanServer and implements the
* {@link ModifiableClassLoaderRepository} interface.
* Addition and removal of ClassLoaders is not supported in this
* implementation: a {@link java.lang.UnsupportedOperationException}
* is thrown.
* <p>The {@link ModifiableClassLoaderRepository} interface is implemented
* for backward compatibility with Java DMK 5.0. However, client code which
* relied on the <code>addClassLoader(...) / removeClassLoader(...)</code>
* APIs will no longer operate properly.
*
* @since Java DMK 5.1
*/
class CompatibleClassLoaderRepositorySupport
implements ModifiableClassLoaderRepository {
private final MBeanServer inner;
private final static String unsupported =
"Operation not supported in this implementation";
/**
* Emulate a ModifiableClassLoaderRepository by wrapping a
* {@link javax.management.MBeanServer}.
*
* @since Java DMK 5.1
**/
public CompatibleClassLoaderRepositorySupport(MBeanServer inner) {
if (inner == null) throw new
IllegalArgumentException("inner MBeanServer is null");
this.inner = inner;
}
/**
* <b>Not supported</b>, unless the underlying MBeanServer is able
* to return a {@link ModifiableClassLoaderRepository} which supports it.
* @exception UnsupportedOperationException if unsupported.
**/
public void addClassLoader(ClassLoader loader) {
final ClassLoaderRepository clr = inner.getClassLoaderRepository();
if (clr instanceof ModifiableClassLoaderRepository)
((ModifiableClassLoaderRepository)clr).addClassLoader(loader);
else throw new UnsupportedOperationException(unsupported);
}
/**
* <b>Not supported</b>, unless the underlying MBeanServer is able
* to return a {@link ModifiableClassLoaderRepository} which supports it.
* @exception UnsupportedOperationException if unsupported.
**/
public void removeClassLoader(ClassLoader loader) {
final ClassLoaderRepository clr = inner.getClassLoaderRepository();
if (clr instanceof ModifiableClassLoaderRepository)
((ModifiableClassLoaderRepository)clr).removeClassLoader(loader);
else throw new UnsupportedOperationException(unsupported);
}
/**
* <b>Not supported</b>, unless the underlying MBeanServer is able
* to return a {@link ModifiableClassLoaderRepository} which supports it.
* @exception UnsupportedOperationException if unsupported.
**/
public void addClassLoader(ObjectName name, ClassLoader loader) {
final ClassLoaderRepository clr = inner.getClassLoaderRepository();
if (clr instanceof ModifiableClassLoaderRepository)
((ModifiableClassLoaderRepository)clr).
addClassLoader(name,loader);
else throw new UnsupportedOperationException(unsupported);
}
/**
* <b>Not supported</b>, unless the underlying MBeanServer is able
* to return a {@link ModifiableClassLoaderRepository} which supports it.
* @exception UnsupportedOperationException if unsupported.
**/
public void removeClassLoader(ObjectName name) {
final ClassLoaderRepository clr = inner.getClassLoaderRepository();
if (clr instanceof ModifiableClassLoaderRepository)
((ModifiableClassLoaderRepository)clr).removeClassLoader(name);
else throw new UnsupportedOperationException(unsupported);
}
/**
* Get a named ClassLoader from the repository.
**/
public ClassLoader getClassLoader(ObjectName name) {
try { return inner.getClassLoader(name); }
catch (InstanceNotFoundException e) { return null; }
}
public final Class loadClass(String className)
throws ClassNotFoundException {
final ClassLoaderRepository clr = inner.getClassLoaderRepository();
if (clr == null)
throw new UnsupportedOperationException(unsupported);
return clr.loadClass(className);
}
public final Class loadClassWithout(ClassLoader loader,String className)
throws ClassNotFoundException {
final ClassLoaderRepository clr = inner.getClassLoaderRepository();
if (clr == null)
throw new UnsupportedOperationException(unsupported);
return clr.loadClassWithout(loader,className);
}
public final Class loadClassBefore(ClassLoader loader,String className)
throws ClassNotFoundException {
final ClassLoaderRepository clr = inner.getClassLoaderRepository();
if (clr == null)
throw new UnsupportedOperationException(unsupported);
return clr.loadClassBefore(loader,className);
}
}