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/*
 *  Copyright (C) 2020 Information Retrieval Group at Universidad Autónoma
 *  de Madrid, http://ir.ii.uam.es
 *
 *  This Source Code Form is subject to the terms of the Mozilla Public
 *  License, v. 2.0. If a copy of the MPL was not distributed with this
 *  file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
package es.uam.eps.ir.relison.diffusion.expiration;

import es.uam.eps.ir.relison.diffusion.data.Data;
import es.uam.eps.ir.relison.diffusion.data.Information;
import es.uam.eps.ir.relison.diffusion.simulation.UserState;

import java.io.Serializable;
import java.util.stream.Stream;

/**
 * Expiration mechanism that discards information pieces after a certain number of iterations.
 *
 * @author Javier Sanz-Cruzado ([email protected])
 * @author Pablo Castells ([email protected])
 *
 * @param  type of the users.
 * @param  type of the information.
 * @param  type of the parameters.
 */
public class TimedExpirationMechanism implements ExpirationMechanism
{
    /**
     * Time before expiration.
     */
    public final long maxTime;
    
    /**
     * Constructor.
     * @param maxTime Time before expiration of the information piece.
     */
    public TimedExpirationMechanism(long maxTime)
    {
        this.maxTime = maxTime;
    }
    
    @Override
    public Stream expire(UserState user, Data data, int numIter, Long timestamp)
    {
        return user.getReceivedInformation().filter(piece -> (numIter - piece.getTimestamp()) > maxTime).map(Information::getInfoId);
    }
    
}