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/*
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 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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 * language governing permissions and limitations under the License.
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package org.glassfish.hk2.extras.interception.internal;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.HashSet;

import org.glassfish.hk2.extras.interception.InterceptionBinder;

/**
 * @author jwells
 *
 */
public class ReflectionUtilities {
    public static  HashSet getAllBindingsFromMethod(Method m) {
        HashSet retVal = getAllBindingsFromClass(m.getDeclaringClass());
        
        Annotation allMethodAnnotations[] = m.getAnnotations();
        for (Annotation aMethodAnnotation : allMethodAnnotations) {
            if (!isBindingAnnotation(aMethodAnnotation)) continue;
            
            getAllBinderAnnotations(aMethodAnnotation, retVal);
        }
        
        return retVal;
    }
    
    public static  HashSet getAllBindingsFromConstructor(Constructor m) {
        HashSet retVal = getAllBindingsFromClass(m.getDeclaringClass());
        
        Annotation allMethodAnnotations[] = m.getAnnotations();
        for (Annotation aMethodAnnotation : allMethodAnnotations) {
            if (!isBindingAnnotation(aMethodAnnotation)) continue;
            
            getAllBinderAnnotations(aMethodAnnotation, retVal);
        }
        
        return retVal;
    }
    
    public static  HashSet getAllBindingsFromClass(Class c) {
        HashSet retVal = new HashSet();
        
        Annotation allClassAnnotations[] = c.getAnnotations();
        for (Annotation aClassAnnotation : allClassAnnotations) {
            if (!isBindingAnnotation(aClassAnnotation)) continue;
            
            getAllBinderAnnotations(aClassAnnotation, retVal);
        }
        
        return retVal;
    }
    
    private static boolean isBindingAnnotation(Annotation a) {
        return (a.annotationType().getAnnotation(InterceptionBinder.class)) != null;
    }
    
    private static void getAllBinderAnnotations(Annotation a, HashSet retVal) {
        String aName = a.annotationType().getName();
        if (retVal.contains(aName)) return;
        retVal.add(aName);
        
        Annotation subAnnotations[] = a.annotationType().getAnnotations();
        for (Annotation subAnnotation : subAnnotations) {
            if (!isBindingAnnotation(subAnnotation)) continue;
            
            String subName = subAnnotation.annotationType().getName();
            if (retVal.contains(subName)) continue;
            
            getAllBinderAnnotations(subAnnotation, retVal);
        }
    }

}