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/*******************************************************************************
 *  Copyright (C) 2007, 2015:
 *  
 *    - Ferdinando Villa 
 *    - integratedmodelling.org
 *    - any other authors listed in @author annotations
 *
 *    All rights reserved. This file is part of the k.LAB software suite,
 *    meant to enable modular, collaborative, integrated 
 *    development of interoperable data and model components. For
 *    details, see http://integratedmodelling.org.
 *    
 *    This program is free software; you can redistribute it and/or
 *    modify it under the terms of the Affero General Public License 
 *    Version 3 or 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
 *    Affero General Public License for more details.
 *  
 *     You should have received a copy of the Affero General Public License
 *     along with this program; if not, write to the Free Software
 *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *     The license is also available at: https://www.gnu.org/licenses/agpl.html
 *******************************************************************************/
package org.integratedmodelling.engine.modelling.functions.random;

import java.util.Map;

import org.integratedmodelling.api.knowledge.IConcept;
import org.integratedmodelling.api.knowledge.IExpression;
import org.integratedmodelling.api.monitoring.IMonitor;
import org.integratedmodelling.api.services.annotations.Prototype;
import org.integratedmodelling.common.kim.expr.CodeExpression;
import org.integratedmodelling.common.vocabulary.NS;
import org.integratedmodelling.engine.modelling.datasources.RandomDataSource;
import org.integratedmodelling.exceptions.KlabException;

@Prototype(id = "rand.poisson", args = { "lambda", Prototype.FLOAT }, returnTypes = { NS.DATASOURCE })
public class POISSON extends CodeExpression implements IExpression {

    @Override
    public Object eval(Map parameters, IMonitor monitor, IConcept... context)
            throws KlabException {

        double lambda = 0.0;
        if (parameters.containsKey("lambda")) {
            lambda = Double.parseDouble(parameters.get("lambda").toString());
        }

        return new RandomDataSource("PoissonDist", lambda);
    }

}