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/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 * Copyright 2007-2008 Sun Microsystems, Inc. All rights reserved.
 *
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 * 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.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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package org.atmosphere.jersey;

import java.lang.reflect.Type;
import com.sun.jersey.core.spi.component.ComponentContext;
import com.sun.jersey.core.spi.component.ComponentScope;
import com.sun.jersey.spi.inject.Injectable;
import com.sun.jersey.spi.inject.InjectableProvider;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.core.Context;
import javax.ws.rs.ext.Provider;
import org.atmosphere.cpr.AsynchronousProcessor;
import org.atmosphere.cpr.AtmosphereResource;
import org.atmosphere.handler.ReflectorServletProcessor;
import org.atmosphere.util.BroadcasterLookup;

/**
 * Allow {@link BroadcasterLookup} injection via the {@link Context} annotation supported
 * by Jersey.
 * 
 * @author Jeanfrancois Arcand
 */
@Provider
public class BroadcasterLookupInjector implements InjectableProvider {

    // The current {@link HttpServletrequest{
    @Context
    HttpServletRequest req;

    public ComponentScope getScope() {
        return ComponentScope.Singleton;
    }

    public Injectable getInjectable(ComponentContext ic, Context a, Type c) {
        if (BroadcasterLookup.class == c) {
            return new Injectable() {

                public BroadcasterLookup getValue() {
                    AtmosphereResource r = null;

                    if ((Boolean) req.getAttribute(AsynchronousProcessor.SUPPORT_SESSION)) {
                        r = (AtmosphereResource) req.getSession().
                                getAttribute(AtmosphereFilter.SUSPENDED_RESOURCE);
                    }

                    if (r == null) {
                        r = (AtmosphereResource)
                          req.getAttribute(ReflectorServletProcessor.ATMOSPHERE_RESOURCE);
                    }

                    if (r != null) {
                        return r.getAtmosphereConfig().getBroadcasterLookup();
                    } else {
                        return null;
                    }
                }
            };
        }
        return null;
    }
}