co.paralleluniverse.common.reflection.AnnotationUtil Maven / Gradle / Ivy
/*
* Quasar: lightweight threads and actors for the JVM.
* Copyright (c) 2013-2014, Parallel Universe Software Co. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 3.0
* as published by the Free Software Foundation.
*/
package co.paralleluniverse.common.reflection;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.util.concurrent.atomic.AtomicBoolean;
import co.paralleluniverse.fibers.instrument.QuasarInstrumentor;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Type;
/**
*
* @author pron
*/
public final class AnnotationUtil {
public static boolean hasClassAnnotation(Class annotationType, byte[] classData) {
return hasClassAnnotation(annotationType, new ClassReader(classData));
}
public static boolean hasClassAnnotation(Class annotationType, InputStream classData) throws IOException {
return hasClassAnnotation(annotationType, new ClassReader(classData));
}
private static boolean hasClassAnnotation(Class annClass, ClassReader r) {
// annotationName = annotationName.replace('.', '/');
final String annDesc = Type.getDescriptor(annClass);
final AtomicBoolean res = new AtomicBoolean(false);
r.accept(new ClassVisitor(QuasarInstrumentor.ASMAPI) {
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
}
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
if (desc.equals(annDesc))
res.set(true);
return null;
}
}, ClassReader.SKIP_CODE | ClassReader.SKIP_DEBUG);
return res.get();
}
private AnnotationUtil() {
}
}