//$Id: InstrumentedClassLoader.java 9796 2006-04-26 06:46:52Z epbernard $
package org.hibernate.ejb.test.instrument;
import java.io.IOException;
import java.io.InputStream;
import java.lang.instrument.IllegalClassFormatException;
import java.util.List;
import org.hibernate.ejb.instrument.InterceptFieldClassFileTransformer;
/**
* @author Emmanuel Bernard
*/
public class InstrumentedClassLoader extends ClassLoader {
private List<String> entities;
public InstrumentedClassLoader(ClassLoader parent) {
super( parent );
}
@Override
public Class<?> loadClass(String name) throws ClassNotFoundException {
if ( "java.lang.Object".equals( name ) ) return getParent().loadClass( name );
Class c = findLoadedClass( name );
if ( c != null ) return c;
InputStream is = this.getResourceAsStream( name.replace( ".", "/" ) + ".class" );
if ( is == null ) throw new ClassNotFoundException( name );
byte[] buffer = new byte[409600];
byte[] originalClass = new byte[0];
int r = 0;
try {
r = is.read( buffer );
}
catch (IOException e) {
throw new ClassNotFoundException( name + " not found", e );
}
while ( r >= buffer.length ) {
byte[] temp = new byte[ originalClass.length + buffer.length ];
System.arraycopy( originalClass, 0, temp, 0, originalClass.length );
System.arraycopy( buffer, 0, temp, originalClass.length, buffer.length );
originalClass = temp;
}
if ( r != -1 ) {
byte[] temp = new byte[ originalClass.length + r ];
System.arraycopy( originalClass, 0, temp, 0, originalClass.length );
System.arraycopy( buffer, 0, temp, originalClass.length, r );
originalClass = temp;
}
try {
is.close();
}
catch (IOException e) {
throw new ClassNotFoundException( name + " not found", e );
}
InterceptFieldClassFileTransformer t = new InterceptFieldClassFileTransformer( entities );
byte[] transformed = new byte[0];
try {
transformed = t.transform(
getParent(),
name,
null,
null,
originalClass
);
}
catch (IllegalClassFormatException e) {
throw new ClassNotFoundException( name + " not found", e );
}
return defineClass( name, transformed, 0, transformed.length );
}
public void setEntities(List<String> entities) {
this.entities = entities;
}
}