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package com.sun.jersey.core.spi.component;

import com.sun.jersey.core.reflection.AnnotatedMethod;
import com.sun.jersey.core.reflection.MethodList;
import com.sun.jersey.core.reflection.ReflectionHelper;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;

/**
 * A destructor of a component.
 *
 * @author Paul.Sandoz@Sun.Com
 */
public class ComponentDestructor {
    private final List<Method> preDestroys;

    /**
     * Create a component destructor.
     *
     * @param c the class of instances to destruct.
     */
    public ComponentDestructor(Class c) {
        this.preDestroys = getPreDestroyMethods(c);
    }

    private static List<Method> getPreDestroyMethods(Class c) {
        Class preDestroyClass = AccessController.doPrivileged(ReflectionHelper.classForNamePA("javax.annotation.PreDestroy"));
        List<Method> list = new ArrayList<Method>();
        HashSet<String> names = new HashSet<String>();
        if (preDestroyClass != null) {
            MethodList methodList = new MethodList(c, true);
            for (AnnotatedMethod m : methodList.
                    hasAnnotation(preDestroyClass).
                    hasNumParams(0).
                    hasReturnType(void.class)) {
                Method method = m.getMethod();
                // only add method if not hidden/overridden
                if (names.add(method.getName())) {
                    AccessController.doPrivileged(ReflectionHelper.setAccessibleMethodPA(method));
                    list.add(method);
                }
            }
        }
        return list;
    }

    public void destroy(Object o) throws IllegalAccessException,
            IllegalArgumentException, InvocationTargetException {
        for (Method preDestroy : preDestroys) {
            preDestroy.invoke(o);
        }
    }
}