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package com.sun.jersey.core.reflection;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.ws.rs.Consumes;
import javax.ws.rs.CookieParam;
import javax.ws.rs.DefaultValue;
import javax.ws.rs.Encoded;
import javax.ws.rs.FormParam;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.HttpMethod;
import javax.ws.rs.MatrixParam;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.Context;
/**
*
* @author [email protected]
*/
public final class AnnotatedMethod implements AnnotatedElement {
@SuppressWarnings("unchecked")
private static final Set>
METHOD_META_ANNOTATIONS = getSet(
HttpMethod.class);
@SuppressWarnings("unchecked")
private static final Set>
METHOD_ANNOTATIONS = getSet(
Path.class,
Produces.class,
Consumes.class);
@SuppressWarnings("unchecked")
private static final Set>
PARAMETER_ANNOTATIONS = getSet(
Context.class,
Encoded.class,
DefaultValue.class,
MatrixParam.class,
QueryParam.class,
CookieParam.class,
HeaderParam.class,
PathParam.class,
FormParam.class);
private static Set> getSet(Class... cs) {
Set> s = new HashSet>();
for (Class c : cs) s.add(c);
return s;
}
private final Method m;
private final Method am;
private final Annotation[] methodAnnotations;
private final Annotation[][] parameterAnnotations;
public AnnotatedMethod(Method m) {
this.m = m;
this.am = findAnnotatedMethod(m);
if (m.equals(am)) {
methodAnnotations = m.getAnnotations();
parameterAnnotations = m.getParameterAnnotations();
} else {
methodAnnotations = mergeMethodAnnotations(m, am);
parameterAnnotations = mergeParameterAnnotations(m, am);
}
}
public Method getMethod() {
return am;
}
public Annotation[][] getParameterAnnotations() {
return parameterAnnotations.clone();
}
public Class[] getParameterTypes() {
return am.getParameterTypes();
}
public TypeVariable[] getTypeParameters() {
return am.getTypeParameters();
}
public Type[] getGenericParameterTypes() {
return am.getGenericParameterTypes();
}
public List getMetaMethodAnnotations(
Class annotation) {
List ma = new ArrayList();
for (Annotation a : methodAnnotations) {
if (a.annotationType().getAnnotation(annotation) != null) {
ma.add(a.annotationType().getAnnotation(annotation));
}
}
return ma;
}
@Override
public String toString() {
return m.toString();
}
// AnnotatedElement
public boolean isAnnotationPresent(Class annotationType) {
for (Annotation ma : methodAnnotations) {
if (ma.annotationType() == annotationType)
return true;
}
return false;
}
public T getAnnotation(Class annotationType) {
for (Annotation ma : methodAnnotations) {
if (ma.annotationType() == annotationType)
return annotationType.cast(ma);
}
return am.getAnnotation(annotationType);
}
public Annotation[] getAnnotations() {
return methodAnnotations.clone();
}
public Annotation[] getDeclaredAnnotations() {
return getAnnotations();
}
//
private static Annotation[] mergeMethodAnnotations(Method m, Method am) {
List al = asList(m.getAnnotations());
for (Annotation a : am.getAnnotations()) {
if (!m.isAnnotationPresent(a.getClass()))
al.add(a);
}
return al.toArray(new Annotation[0]);
}
private static Annotation[][] mergeParameterAnnotations(Method m, Method am) {
Annotation[][] mp = m.getParameterAnnotations();
Annotation[][] amp = am.getParameterAnnotations();
List> ala = new ArrayList>();
for (int i = 0; i < mp.length; i++) {
List al = asList(mp[i]);
for (Annotation a : amp[i])
if (!isAnnotatonPresent(a.getClass(), al))
al.add(a);
ala.add(al);
}
Annotation[][] paa = new Annotation[mp.length][];
for (int i = 0; i < mp.length; i++) {
paa[i] = ala.get(i).toArray(new Annotation[0]);
}
return paa;
}
private static boolean isAnnotatonPresent(Class ca, List la) {
for (Annotation a : la) {
if (ca == a.getClass())
return true;
}
return false;
}
private static Method findAnnotatedMethod(Method m) {
Method am = findAnnotatedMethod(m.getDeclaringClass(), m);
return (am != null) ? am : m;
}
private static Method findAnnotatedMethod(Class c, Method m) {
if (c == Object.class)
return null;
m = ReflectionHelper.findMethodOnClass(c, m);
if (m == null)
return null;
if (hasAnnotations(m)) return m;
// Super classes take precendence over interfaces
Class sc = c.getSuperclass();
if (sc != null && sc != Object.class) {
Method sm = findAnnotatedMethod(sc, m);
if (sm != null) return sm;
}
for (Class ic : c.getInterfaces()) {
Method im = findAnnotatedMethod(ic, m);
if (im != null) return im;
}
return null;
}
private static boolean hasAnnotations(Method m) {
return hasMetaMethodAnnotations(m) ||
hasMethodAnnotations(m) ||
hasParameterAnnotations(m);
}
private static boolean hasMetaMethodAnnotations(Method m) {
for (Class ac : METHOD_META_ANNOTATIONS)
for (Annotation a : m.getAnnotations())
if (a.annotationType().getAnnotation(ac) != null) return true;
return false;
}
private static boolean hasMethodAnnotations(Method m) {
for (Class ac : METHOD_ANNOTATIONS)
if (m.isAnnotationPresent(ac)) return true;
return false;
}
private static boolean hasParameterAnnotations(Method m) {
for (Annotation[] as : m.getParameterAnnotations())
for (Annotation a : as)
if (PARAMETER_ANNOTATIONS.contains(a.annotationType())) return true;
return false;
}
private static List asList(T... ts) {
List l = new ArrayList();
for (T t : ts) l.add(t);
return l;
}
}