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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012 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.
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 * GPL Classpath Exception:
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package org.jvnet.hk2.internal;

import java.lang.reflect.Method;

import javassist.util.proxy.MethodHandler;
import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.Context;
import org.glassfish.hk2.api.MultiException;
import org.glassfish.hk2.api.ServiceHandle;
import org.glassfish.hk2.utilities.reflection.ReflectionHelper;

/**
 * @author jwells
 * @author mtaube
 */
public class MethodInterceptorImpl implements MethodHandler {
    private final static String PROXY_MORE_METHOD_NAME = "__make";
    
    private final ServiceLocatorImpl locator;
    private final ActiveDescriptor descriptor;
    private final ServiceHandle root;
    
    /* package */ MethodInterceptorImpl(ServiceLocatorImpl sli, ActiveDescriptor descriptor, ServiceHandle root) {
        this.locator = sli;
        this.descriptor = descriptor;
        this.root = root;
    }

    @Override
    public Object invoke(Object target, Method method, Method proceed, Object[] params) throws Throwable {
        Context context;
        Object service;

        context = locator.resolveContext(descriptor.getScopeAnnotation());
        service = context.findOrCreate(descriptor, root);

        if (service == null) {
            throw new MultiException(new IllegalStateException("Proxiable context " +
                    context + " findOrCreate returned a null for descriptor " + descriptor +
                    " and handle " + root));
        }

        if (method.getName().equals(PROXY_MORE_METHOD_NAME)) {
            // We did what we came here to do
            return service;
        }

        return ReflectionHelper.invoke(service, method, params, locator.getNeutralContextClassLoader());

    }
}