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/*
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 *
 * Copyright (c) 2012-2015 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
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package br.com.andrewribeiro.ribrest.services.cdi.hk2;

import br.com.andrewribeiro.ribrest.services.cdi.hk2.annotations.RequestScope;
import java.lang.annotation.Annotation;
import java.util.HashMap;
import java.util.Map;


import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.Context;
import org.glassfish.hk2.api.ServiceHandle;

/**
 * This is the request scope context.  It houses all request scope
 * objects.  This is a proxiable scope, so care must be taken that
 * all objects from this scope are proxiable
 * 
 * @author jwells
 */
public class RequestContext implements Context {       
    
    private final HashMap, Object> requestScopedEntities = new HashMap, Object>();
    
    private boolean inRequest = false;
    
    /**
     * Starts a request
     */
    public void startRequest() {
        inRequest = true;
    }
    
    /**
     * Stops a request (including properly disposing all the previous request objects)
     */
    @SuppressWarnings("unchecked")
    public void stopRequest() {
        inRequest = false;
        
        for (Map.Entry, Object> entry : requestScopedEntities.entrySet()) {
            ActiveDescriptor ad = (ActiveDescriptor) entry.getKey();
            Object value = entry.getValue();
            
            ad.dispose(value);
        }
        
        requestScopedEntities.clear();
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#getScope()
     */
    @Override
    public Class getScope() {
        return RequestScope.class;
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#findOrCreate(org.glassfish.hk2.api.ActiveDescriptor, org.glassfish.hk2.api.ServiceHandle)
     */
    @SuppressWarnings("unchecked")
    @Override
    public  U findOrCreate(ActiveDescriptor activeDescriptor,
            ServiceHandle root) {
        U retVal = (U) requestScopedEntities.get(activeDescriptor);
        if (retVal != null) {
            return retVal;
        }
        
        retVal = activeDescriptor.create(root);
        requestScopedEntities.put(activeDescriptor, retVal);
        
        return retVal;
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#find(org.glassfish.hk2.api.ActiveDescriptor)
     */
    @SuppressWarnings("unchecked")
    @Override
    public boolean containsKey(ActiveDescriptor descriptor) {
        return requestScopedEntities.containsKey(descriptor);
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#isActive()
     */
    @Override
    public boolean isActive() {
        return inRequest;
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#supportsNullCreation()
     */
    @Override
    public boolean supportsNullCreation() {
        // TODO Auto-generated method stub
        return false;
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.Context#supportsNullCreation()
     */
    @Override
    public void shutdown() {
    }

    @Override
    public void destroyOne(ActiveDescriptor descriptor) {
    }

}