Round.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2011 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.turro.math;
 
public class Round {
  
  private double value;
  
  public Round(double value) {
    this.value = value;
  }
 
  public Round decimals(int digits) {
    double tmp = Math.pow(10.0, digits);
    value = ((double) Math.floor((value * tmp) + 0.5555555)) / tmp;
    return this;
  }
  
  public double perCent(int digits) {
    value *= 100.0;
    return decimals(digits).value();
  }
  
  public double value() {
    return value;
  }
  
  /* Factory */
  
  public static Round from(double value) {
    return new Round(value);
  }
  
}