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package com.sun.xml.bind.v2.model.annotation;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;
import com.sun.xml.bind.v2.runtime.Location;
/**
* {@link Annotation} that also implements {@link Locatable}.
*
* @author Kohsuke Kawaguchi
*/
public class LocatableAnnotation implements InvocationHandler, Locatable, Location {
private final Annotation core;
private final Locatable upstream;
/**
* Wraps the annotation into a proxy so that the returned object will also implement
* {@link Locatable}.
*/
public static A create( A annotation, Locatable parentSourcePos ) {
if(annotation==null) return null;
Class type = annotation.annotationType();
if(quicks.containsKey(type)) {
// use the existing proxy implementation if available
return (A)quicks.get(type).newInstance(parentSourcePos,annotation);
}
// otherwise take the slow route
ClassLoader cl = LocatableAnnotation.class.getClassLoader();
try {
Class loadableT = Class.forName(type.getName(), false, cl);
if(loadableT !=type)
return annotation; // annotation type not loadable from this class loader
return (A)Proxy.newProxyInstance(cl,
new Class[]{ type, Locatable.class },
new LocatableAnnotation(annotation,parentSourcePos));
} catch (ClassNotFoundException e) {
// annotation not loadable
return annotation;
} catch (IllegalArgumentException e) {
// Proxy.newProxyInstance throws this if it cannot resolve this annotation
// in this classloader
return annotation;
}
}
LocatableAnnotation(Annotation core, Locatable upstream) {
this.core = core;
this.upstream = upstream;
}
public Locatable getUpstream() {
return upstream;
}
public Location getLocation() {
return this;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
try {
if(method.getDeclaringClass()==Locatable.class)
return method.invoke(this,args);
if(Modifier.isStatic(method.getModifiers()))
// malicious code can pass in a static Method object.
// doing method.invoke() would end up executing it,
// so we need to protect against it.
throw new IllegalArgumentException();
return method.invoke(core,args);
} catch (InvocationTargetException e) {
if(e.getTargetException()!=null)
throw e.getTargetException();
throw e;
}
}
public String toString() {
return core.toString();
}
/**
* List of {@link Quick} implementations keyed by their annotation type.
*/
private static final Map quicks = new HashMap();
static {
for( Quick q : Init.getAll() ) {
quicks.put(q.annotationType(),q);
}
}
}