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package java.lombok;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Allows you to inject the lombok classes into any classloader, even if that classloader does not
* know how to find the lombok classes.
*
* Example: Injecting lombok's Eclipse Parser patching code into eclipse's OSGi BundleLoader.
*
* @author rzwitserloot
*/
public class ClassLoaderWorkaround {
static RuntimeException sneakyThrow(Throwable t) {
if ( t == null ) throw new NullPointerException("t");
ClassLoaderWorkaround.<RuntimeException>sneakyThrow0(t);
return null;
}
@SuppressWarnings("unchecked")
private static <T extends Throwable> void sneakyThrow0(Throwable t) throws T {
throw (T)t;
}
private static boolean initialized;
private static Method transform;
public static void transformCompilationUnitDeclaration(Object parser, Object cud) throws Exception {
initialize(cud);
try {
transform.invoke(null, parser, cud);
} catch ( InvocationTargetException e ) {
throw sneakyThrow(e.getCause());
}
}
private static void initialize(Object cud) throws ClassNotFoundException {
if ( initialized ) {
if ( transform == null ) throw new ClassNotFoundException("lombok.eclipse.TransformEclipseAST");
return;
}
final ClassLoader parent = cud.getClass().getClassLoader();
ClassLoader loader = new ClassLoader() {
@Override public Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
if ( name.startsWith("lombok.") ) {
InputStream in = ClassLoader.getSystemClassLoader().getResourceAsStream(name.replace(".", "/") + ".class");
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] b = new byte[65536];
try {
while ( true ) {
int r = in.read(b);
if ( r == -1 ) break;
if ( r > 0 ) out.write(b, 0, r);
}
in.close();
byte[] data = out.toByteArray();
Class<?> result = defineClass(name, data, 0, data.length);
if ( resolve ) resolveClass(result);
return result;
} catch ( IOException e ) {
throw new ClassNotFoundException();
}
} else {
try {
Class<?> result = ClassLoader.getSystemClassLoader().loadClass(name);
if ( resolve ) resolveClass(result);
return result;
} catch ( ClassNotFoundException e ) {
Class<?> result = parent.loadClass(name);
if ( resolve ) resolveClass(result);
return result;
}
}
}
};
try {
Class<?> c = loader.loadClass("lombok.eclipse.TransformEclipseAST");
for ( Method m : c.getMethods() ) {
if ( m.getName().equals("transform") ) {
Class<?>[] types = m.getParameterTypes();
if ( types.length != 2 ) continue;
if ( !types[0].getName().equals("org.eclipse.jdt.internal.compiler.parser.Parser") ) continue;
if ( !types[1].getName().equals("org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration") ) continue;
transform = m;
break;
}
}
} catch ( ClassNotFoundException ignore ) {}
initialized = true;
}
}
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