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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2011-2012 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.
 *
 * GPL Classpath Exception:
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 * exception as provided by Oracle in the GPL Version 2 section of the License
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package org.glassfish.resourcebase.resources.util;

import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.ServiceHandle;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.resourcebase.resources.api.ResourceDeployer;
import org.glassfish.resourcebase.resources.api.ResourceDeployerInfo;
import org.jvnet.hk2.annotations.Service;

import javax.inject.Inject;
import javax.inject.Singleton;
import java.lang.reflect.Proxy;
import java.util.List;

/**
 * @author Jagadish Ramu
 */
@Singleton
@Service
public class ResourceManagerFactory {
    public final static String METADATA_KEY = "ResourceImpl";

    @Inject
    private ServiceLocator locator;

    public ResourceDeployer getResourceDeployer(Object resource){
        ServiceHandle deployerHandle = null;
        for (ServiceHandle handle : locator.getAllServiceHandles(ResourceDeployerInfo.class)) {
            ActiveDescriptor desc = handle.getActiveDescriptor();
            if (desc == null) continue;
            
            List resourceImpls = desc.getMetadata().get(METADATA_KEY);
            if (resourceImpls == null || resourceImpls.isEmpty()) continue;
            String resourceImpl = resourceImpls.get(0);
            
            if(Proxy.isProxyClass(resource.getClass())){
                for(Class clz : resource.getClass().getInterfaces()){
                    if(resourceImpl.equals(clz.getName())){
                        deployerHandle = handle;
                        break;
                    }
                }
                        
                if(deployerHandle != null){
                    break;
                }
            }
                
            if(resourceImpl.equals(resource.getClass().getName())){
                deployerHandle = handle;
                break;
            }
                
            //hack : for JdbcConnectionPool impl used by DataSourceDefinition.
            //check whether the interfaces implemented by the class matches
            for(Class clz : resource.getClass().getInterfaces()){
                if(resourceImpl.equals(clz.getName())){
                    deployerHandle = handle;
                    break;
                }
            }
                    
            if(deployerHandle != null){
                break;
            }
        }
        
        if (deployerHandle != null){
            Object deployer = deployerHandle.getService();
            if(deployer != null && deployer instanceof ResourceDeployer){
                return (ResourceDeployer) deployer;
            }
        }
        
        return null;
    }

}