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 *
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 *    conditions of the Creative Commons License, Version 2.5, Attribution,
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 *
 *    Please make sure that third-party modules and libraries are used
 *    according to their respective licenses.
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 *    Any modifications to this package must retain all copyright notices
 *    of the original copyright holder(s) for the original code used.
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 *     This program is free software; you can redistribute it and/or modify it
 *     under the terms of the GNU General Public License, Version 2 as published
 *     by the Free Software Foundation.
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 *     WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 *     or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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 *     You should have received a copy of the GNU General Public License along
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 */

package com.openexchange.server.osgiservice;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Dictionary;
import java.util.List;
import org.osgi.framework.BundleContext;


/**
 * {@link ServiceDependentRegistration}
 *
 * @author <a href="mailto:francisco.laguna@open-xchange.com">Francisco Laguna</a>
 *
 */
public class ServiceDependentRegistration<T> extends ConditionalRegistration implements DynamicServiceStateListener {

    private Whiteboard whiteboard;
    private final List<Object> services = new ArrayList<Object>();

    public ServiceDependentRegistration(final BundleContext context, final String serviceName, final T service, final Dictionary dict, final Whiteboard whiteboard) {
        super(context, serviceName, service, dict);
        this.whiteboard = whiteboard;
        this.service = configure(service);
    }
    
    public ServiceDependentRegistration(final BundleContext context, final String serviceName, final T service, final Whiteboard whiteboard) {
        this(context, serviceName, service, null, whiteboard);
    }
    
    public ServiceDependentRegistration(final BundleContext context, final String serviceName, final Whiteboard whiteboard) {
        this(context, serviceName, (T) null, whiteboard);
    }
    
    public ServiceDependentRegistration(final BundleContext context, final String serviceName, final Dictionary dict, final Whiteboard whiteboard) {
        this(context, serviceName, null, dict, whiteboard);
    }
    
    /**
     * Override to configure the service
     * @param service
     */
    public T configure(final T service) {
        return service;
    }

    public void addDependency(final Object...services) {
        this.services.addAll(Arrays.asList(services));
    }
    
    public <T> T get(final Class<T> clazz) {
        return getAndDependOn(clazz);
    }
    
    public <T> T getAndDependOn(final Class<T> clazz) {
        final T service = whiteboard.getService(clazz, this);
        addDependency(service);
        return service;
    }
    
    @Override
    protected boolean mustRegister() {
        for(final Object service : services) {
            if (! whiteboard.isActive(service)) {
                LOG.info("Missing service. Proxy is not active: "+service+ " needed by "+this.service);
                return false;
            }
        }
        final boolean validateServices = validateServices();
        if(validateServices) {
            LOG.info("All is fine, registering service "+service+".");
            return true;
        }
        return false;
    }
    
    /**
     * Override to add additional constraint requirements to the service
     * @return
     */
    public boolean validateServices() {
        return true;
    }

    public void stateChanged() {
        check();
    }
    
   
}
