001/* Copyright (C) 2014 konik.io
002 *
003 * This file is part of the Konik library.
004 *
005 * The Konik library is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * The Konik library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with the Konik library. If not, see <http://www.gnu.org/licenses/>.
017 */
018package io.konik.jaxb.bindable.unqualified;
019
020import static java.lang.Integer.parseInt;
021import static java.lang.System.getProperty;
022import static java.math.RoundingMode.valueOf;
023
024import java.math.BigDecimal;
025import java.math.RoundingMode;
026
027import javax.xml.bind.annotation.adapters.XmlAdapter;
028
029/**
030 * = Rounding Adapter for percentage.
031 */
032public class PercentRoundingAdapter extends XmlAdapter<BigDecimal, BigDecimal> {
033
034   private static final String DEFAULT_ROUNDING_MODE = "HALF_UP";
035   private static final String DEFAULT_SCALE = "2";
036
037   final int scale;
038   final RoundingMode roundingMode;
039
040   /**
041    * Instantiates a new percent rounding adapter.
042    */
043   public PercentRoundingAdapter() {
044      String name = this.getClass().getName();
045      scale = parseInt(getProperty(name + ".scale", DEFAULT_SCALE));
046      roundingMode = valueOf(getProperty(name + ".roundingMode", DEFAULT_ROUNDING_MODE));
047   }
048
049   @Override
050   public BigDecimal unmarshal(BigDecimal p) throws Exception {
051      return p;
052   }
053
054   @Override
055   public BigDecimal marshal(BigDecimal value) throws Exception {
056      if (value == null) { return null; }
057      return value.setScale(scale, roundingMode).stripTrailingZeros();
058   }
059}