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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.servlet.jersey;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import javax.ws.rs.Path;
import javax.ws.rs.ext.Provider;
import java.util.HashSet;
import java.util.Optional;
import java.util.Set;
/**
* @author Tony Vaagenes
* @author ollivir
*/
public class ResourceOrProviderClassVisitor extends ClassVisitor {
private String className = null;
private boolean isPublic = false;
private boolean isAbstract = false;
private boolean isInnerClass = false;
private boolean isStatic = false;
private boolean isAnnotated = false;
public ResourceOrProviderClassVisitor() {
super(Opcodes.ASM6);
}
public Optional<String> getJerseyClassName() {
if (isJerseyClass()) {
return Optional.of(getClassName());
} else {
return Optional.empty();
}
}
public boolean isJerseyClass() {
return isAnnotated && isPublic && !isAbstract && (!isInnerClass || isStatic);
}
public String getClassName() {
assert (className != null);
return org.objectweb.asm.Type.getObjectType(className).getClassName();
}
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
isPublic = isPublic(access);
className = name;
isAbstract = isAbstract(access);
}
@Override
public void visitInnerClass(String name, String outerName, String innerName, int access) {
assert (className != null);
if (name.equals(className)) {
isInnerClass = true;
isStatic = isStatic(access);
}
}
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
isAnnotated |= annotationClassDescriptors.contains(desc);
return null;
}
private static Set<String> annotationClassDescriptors = new HashSet<>();
static {
annotationClassDescriptors.add(Type.getDescriptor(Path.class));
annotationClassDescriptors.add(Type.getDescriptor(Provider.class));
}
private static boolean isPublic(int access) {
return isSet(Opcodes.ACC_PUBLIC, access);
}
private static boolean isStatic(int access) {
return isSet(Opcodes.ACC_STATIC, access);
}
private static boolean isAbstract(int access) {
return isSet(Opcodes.ACC_ABSTRACT, access);
}
private static boolean isSet(int bits, int access) {
return (access & bits) == bits;
}
public static ResourceOrProviderClassVisitor visit(ClassReader classReader) {
ResourceOrProviderClassVisitor visitor = new ResourceOrProviderClassVisitor();
classReader.accept(visitor, ClassReader.SKIP_DEBUG | ClassReader.SKIP_CODE | ClassReader.SKIP_FRAMES);
return visitor;
}
}
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