ldparameter.java

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/**    
  * Copyright (C) 2006, Laboratorio di Valutazione delle Prestazioni - Politecnico di Milano

  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.

  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.

  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
  
package jmt.engine.NetStrategies.ServiceStrategies;

import jmt.engine.random.Distribution;
import jmt.engine.random.Parameter;

/**
 * <p>Title: Load Dependent Service Time Strategy Parameter</p>
 * <p>Description: Parameter used to specify a sample for Load Dependent service time strategy.
 * This is supposed to hold a range of values, a distribution and a function that have to
 * be evaluated to set mean value for given distribution.</p>
 * 
 * @author Bertoli Marco
 *         Date: 10-ott-2005
 *         Time: 14.58.33
 */
public class LDParameter implements Comparable {
    private int from;
    private Distribution distribution;
    private Parameter parameter;
    private String function;

    /**
     * Construct a new Load Dependent Service Strategy parameter
     * @param from minimum number of jobs for this strategy to apply
     * @param distr service time distribution
     * @param parameter parameter for the service time distribution
     * @param function function to be evaluated to set service time distribution mean value
     */
    public LDParameter(Integer from, Distribution distr,
                       Parameter parameter, String function) {
        this.from = from.intValue();
        this.distribution = distr;
        this.parameter = parameter;
        if (function != null)
            this.function = function.toLowerCase();

    }

    /**
     * Construct a new Load Dependent Service Strategy parameter
     * @param from minimum number of jobs for this strategy to apply
     * @param distr service time distribution
     * @param parameter parameter for the service time distribution
     */
    public LDParameter(Integer from, Distribution distr, Parameter parameter) {
        this(from, distr, parameter, null);
    }

    /**
     * Gets minimum number of jobs for this strategy to apply
     * @return minimum number of jobs for this strategy to apply
     */
    public int getMinJobs() {
        return from;
    }

    /**
     * Gets distribution used to evaluate service time
     * @return distribution used to evaluate service times
     */
    public Distribution getDistribution() {
        return distribution;
    }

    /**
     * Gets the parameter of the distribution used to evaluate service time
     * @return the parameter of the distribution used to evaluate service times
     */
    public Parameter getDistrParameter() {
        return parameter;
    }

    /**
     * Gets the function that must be used to evaluate mean value
     * @return function to evaluateto find mean value or null if not present
     */
    public String getFunction() {
        return function;
    }


    /**
     * Compares this object with the specified object for order.  Returns a
     * negative integer, zero, or a positive integer as this object is less
     * than, equal to, or greater than the specified object.<p>
     * @param o the Object to be compared.
     * @return a negative integer, zero, or a positive integer as this object
     *         is less than, equal to, or greater than the specified object.
     * @throws ClassCastException if the specified object's type prevents it
     *                            from being compared to this Object.
     */
    public int compareTo(Object o) {
        if (o instanceof LDParameter) {
            LDParameter other = (LDParameter) o;
            return this.from - other.from;
        }
        else if (o instanceof Integer) {
            Integer other = (Integer) o;
            return this.from - other.intValue();
        }
        else
            throw new ClassCastException("Unsupported object type");
    }
}