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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved.
 *
 * 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
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * elects to include this software in this distribution under the [CDDL or GPL
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 * and therefore, elected the GPL Version 2 license, then the option applies
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 */
package org.jvnet.hk2.internal;

import java.lang.reflect.Proxy;
import java.security.AccessController;
import java.security.PrivilegedAction;

import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.MultiException;
import org.glassfish.hk2.api.ProxyCtl;
import org.glassfish.hk2.api.ServiceHandle;

import javassist.util.proxy.MethodHandler;
import javassist.util.proxy.ProxyFactory;
import javassist.util.proxy.ProxyObject;

/**
 * Utilities around proxying
 * 
 * @author jwells
 *
 */
public class ProxyUtilities {
    private final static Object proxyCreationLock = new Object();
    
    private static  T secureCreate(final Class superclass,
            final Class[] interfaces,
            final MethodHandler callback,
            boolean useJDKProxy) {

        /* construct the classloader where the generated proxy will be created --
         * this classloader must have visibility into the javaassist classloader as well as
         * the superclass' classloader
         */
        final ClassLoader delegatingLoader = (ClassLoader) AccessController
                .doPrivileged(new PrivilegedAction() {

                    @Override
                    public Object run() {
                        // create a delegating classloader that attempts to
                        // load from the superclass' classloader first,
                        // then hk2-locator's classloader second.
                        return new DelegatingClassLoader(
                                superclass.getClassLoader(),
                                ProxyFactory.class.getClassLoader(),
                                ProxyCtl.class.getClassLoader());
                    }
                });

        if (useJDKProxy) {
            return AccessController.doPrivileged(new PrivilegedAction() {

                @SuppressWarnings("unchecked")
                @Override
                public T run() {
                    return (T) Proxy.newProxyInstance(delegatingLoader, interfaces,
                            new MethodInterceptorInvocationHandler(callback));
                }

            });

        }


        return AccessController.doPrivileged(new PrivilegedAction() {

            @SuppressWarnings("unchecked")
            @Override
            public T run() {
                synchronized (proxyCreationLock) {
                    ProxyFactory.ClassLoaderProvider originalProvider = ProxyFactory.classLoaderProvider;
                    ProxyFactory.classLoaderProvider = new ProxyFactory.ClassLoaderProvider() {
                        
                        @Override
                        public ClassLoader get(ProxyFactory arg0) {
                            return delegatingLoader;
                        }
                    };
                    
                    try {
                        ProxyFactory proxyFactory = new ProxyFactory();
                        proxyFactory.setInterfaces(interfaces);
                        proxyFactory.setSuperclass(superclass);

                        Class proxyClass = proxyFactory.createClass();

                        try {
                            T proxy = (T) proxyClass.newInstance();

                            ((ProxyObject) proxy).setHandler(callback);

                            return proxy;
                        } catch (Exception e1) {
                            throw new RuntimeException(e1);
                        }
                    }
                    finally {
                        ProxyFactory.classLoaderProvider = originalProvider;
                        
                    }
                }
            }

        });

    }
    
    @SuppressWarnings("unchecked")
    public static  T generateProxy(Class requestedClass,
            ServiceLocatorImpl locator,
            ActiveDescriptor root,
            ServiceHandle handle) {
        boolean isInterface = (requestedClass == null) ? false : requestedClass.isInterface() ;

        final Class proxyClass;
        Class iFaces[];
        if (isInterface) {
            proxyClass = requestedClass;
            iFaces = new Class[2];
            iFaces[0] = proxyClass;
            iFaces[1] = ProxyCtl.class;
        }
        else {
            proxyClass = Utilities.getFactoryAwareImplementationClass(root);

            iFaces = Utilities.getInterfacesForProxy(root.getContractTypes());
        }

        T proxy;
        try {
            proxy = (T) secureCreate(proxyClass,
                iFaces,
                new MethodInterceptorImpl(locator, root, handle),
                isInterface);
        }
        catch (Throwable th) {
            Exception addMe = new IllegalArgumentException("While attempting to create a Proxy for " + proxyClass.getName() +
                    " in proxiable scope " + root.getScope() + " an error occured while creating the proxy");

            if (th instanceof MultiException) {
                MultiException me = (MultiException) th;

                me.addError(addMe);

                throw me;
            }

            MultiException me = new MultiException(th);
            me.addError(addMe);
            throw me;
        }

        return proxy;
    }

}
 















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