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package org.apache.commons.io.input;
import java.io.*;
import java.lang.reflect.Proxy;
/**
* A special ObjectInputStream that loads a class based on a specified
* ClassLoader
rather than the system default.
*
* This is useful in dynamic container environments.
*
* @since 1.1
*/
public class ClassLoaderObjectInputStream extends ObjectInputStream {
/**
* The class loader to use.
*/
private final ClassLoader classLoader;
/**
* Constructs a new ClassLoaderObjectInputStream.
*
* @param classLoader the ClassLoader from which classes should be loaded
* @param inputStream the InputStream to work on
* @throws IOException in case of an I/O error
* @throws StreamCorruptedException if the stream is corrupted
*/
public ClassLoaderObjectInputStream(
final ClassLoader classLoader, final InputStream inputStream)
throws IOException, StreamCorruptedException {
super(inputStream);
this.classLoader = classLoader;
}
/**
* Resolve a class specified by the descriptor using the
* specified ClassLoader or the super ClassLoader.
*
* @param objectStreamClass descriptor of the class
* @return the Class object described by the ObjectStreamClass
* @throws IOException in case of an I/O error
* @throws ClassNotFoundException if the Class cannot be found
*/
@Override
protected Class> resolveClass(final ObjectStreamClass objectStreamClass)
throws IOException, ClassNotFoundException {
try {
return Class.forName(objectStreamClass.getName(), false, classLoader);
} catch (final ClassNotFoundException cnfe) {
// delegate to super class loader which can resolve primitives
return super.resolveClass(objectStreamClass);
}
}
/**
* Create a proxy class that implements the specified interfaces using
* the specified ClassLoader or the super ClassLoader.
*
* @param interfaces the interfaces to implement
* @return a proxy class implementing the interfaces
* @throws IOException in case of an I/O error
* @throws ClassNotFoundException if the Class cannot be found
* @see java.io.ObjectInputStream#resolveProxyClass(java.lang.String[])
* @since 2.1
*/
@Override
protected Class> resolveProxyClass(final String[] interfaces) throws IOException,
ClassNotFoundException {
final Class>[] interfaceClasses = new Class[interfaces.length];
for (int i = 0; i < interfaces.length; i++) {
interfaceClasses[i] = Class.forName(interfaces[i], false, classLoader);
}
try {
return Proxy.getProxyClass(classLoader, interfaceClasses);
} catch (final IllegalArgumentException e) {
return super.resolveProxyClass(interfaces);
}
}
}