teichmann@6821: /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
teichmann@6821:  * Software engineering by Intevation GmbH
teichmann@6821:  *
teichmann@6821:  * This file is Free Software under the GNU AGPL (>=v3)
teichmann@6821:  * and comes with ABSOLUTELY NO WARRANTY! Check out the
teichmann@6821:  * documentation coming with Dive4Elements River for details.
teichmann@6821:  */
teichmann@6821: 
teichmann@6821: package org.dive4elements.river.artifacts.model.sq;
teichmann@6821: 
teichmann@6821: public class LogSQ extends SQ {
teichmann@6821: 
teichmann@6821:     public static final View LOG_SQ_VIEW = new View() {
teichmann@6821:         @Override
teichmann@6821:         public double getS(SQ sq) {
teichmann@6821:             return ((LogSQ)sq).getLogS();
teichmann@6821:         }
teichmann@6821: 
teichmann@6821:         @Override
teichmann@6821:         public double getQ(SQ sq) {
teichmann@6821:             return ((LogSQ)sq).getLogQ();
teichmann@6821:         }
teichmann@6821:     };
teichmann@6821: 
teichmann@6821:     public static final Factory LOG_SQ_FACTORY = new Factory() {
teichmann@6821:         @Override
teichmann@6821:         public SQ createSQ(double s, double q) {
teichmann@6821:             return new LogSQ(s, q);
teichmann@6821:         }
teichmann@6821:     };
teichmann@6821: 
teichmann@6821:     protected double logS;
teichmann@6821:     protected double logQ;
teichmann@6821: 
teichmann@6821:     protected boolean logTrans;
teichmann@6821: 
teichmann@6821:     public LogSQ() {
teichmann@6821:     }
teichmann@6821: 
teichmann@6821:     public LogSQ(double s, double q) {
teichmann@6821:         super(s, q);
teichmann@6821:     }
teichmann@6821: 
teichmann@6821:     /** important: We cannot process negative s/q. */
teichmann@6821:     @Override
teichmann@6821:     public boolean isValid() {
teichmann@6821:         return super.isValid() && s > 0d && q > 0d;
teichmann@6821:     }
teichmann@6821: 
teichmann@6821:     protected void ensureLogTrans() {
teichmann@6821:         if (!logTrans) {
teichmann@6821:             logTrans = true;
teichmann@6821:             logS = Math.log(s);
teichmann@6821:             logQ = Math.log(q);
teichmann@6821:         }
teichmann@6821:     }
teichmann@6821: 
teichmann@6821:     public double getLogS() {
teichmann@6821:         ensureLogTrans();
teichmann@6821:         return logS;
teichmann@6821:     }
teichmann@6821: 
teichmann@6821:     public double getLogQ() {
teichmann@6821:         ensureLogTrans();
teichmann@6821:         return logQ;
teichmann@6821:     }
teichmann@6821: }
teichmann@6821: