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.adapter;
019
020import static java.lang.Integer.parseInt;
021import static java.math.RoundingMode.valueOf;
022import io.konik.Configuration;
023
024import java.math.BigDecimal;
025import java.math.RoundingMode;
026
027import javax.xml.bind.annotation.adapters.XmlAdapter;
028
029/**
030 * 
031 * Adapter to round the BigDecimal for marshalling to four decimals after the period.
032 * 
033 * The scale and rounding mode can be overridden via the configuration.
034 * 
035 * Defaults::
036 * 
037 * ----
038 * io.konik.jaxb.adapter.BigDecimalRoundingAdapter.scale=4
039 * io.konik.jaxb.adapter.BigDecimalRoundingAdapter.roundingMode=HALF_UP
040 * ----
041 * 
042 */
043public class QuantityRoundingAdapter extends XmlAdapter<BigDecimal, BigDecimal> {
044
045   private static final String DEFAULT_ROUNDING_MODE = "HALF_UP";
046   private static final String DEFAULT_SCALE = "4";
047
048   final int scale;
049   final RoundingMode roundingMode;
050   private final boolean stripTrailingZeros;
051
052   /**
053    * Instantiates a new amount rounding adapter.
054    */
055   public QuantityRoundingAdapter() {
056      String name = this.getClass().getName();
057      scale = parseInt(Configuration.INSTANCE.getProperty(name + ".scale", DEFAULT_SCALE));
058      roundingMode = valueOf(Configuration.INSTANCE.getProperty(name + ".roundingMode", DEFAULT_ROUNDING_MODE));
059      stripTrailingZeros = Configuration.INSTANCE.stripTrailingZeros();
060   }
061
062   @Override
063   public BigDecimal unmarshal(BigDecimal amount) throws Exception {
064      return amount;
065   }
066
067   @Override
068   public BigDecimal marshal(BigDecimal amount) throws Exception {
069      if (amount == null) { return null; }
070      BigDecimal roundedValue = amount.setScale(scale, roundingMode);
071      if (stripTrailingZeros) { return roundedValue.stripTrailingZeros(); }
072      return roundedValue;
073   }
074}