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;
023import io.konik.zugferd.unqualified.Amount;
024
025import java.math.BigDecimal;
026import java.math.RoundingMode;
027
028import javax.xml.bind.annotation.adapters.XmlAdapter;
029
030/**
031 * 
032 * Adapter to round the amount during marshalling to two decimals after the period.
033 * 
034 * The scale and rounding mode can be overridden via the configuration.
035 * 
036 * Defaults::
037 * 
038 * ----
039 * io.konik.jaxb.adapter.TwoDigitRoundingAdapter.scale=2
040 * io.konik.jaxb.adapter.TwoDigitRoundingAdapter.roundingMode=HALF_UP
041 * ----
042 */
043public class TwoDigitRoundingAdapter extends XmlAdapter<Amount, Amount> {
044
045   private static final String DEFAULT_SCALE = "2";
046   private static final String DEFAULT_ROUNDING_MODE = "HALF_UP";
047
048   private final int scale;
049   private final RoundingMode roundingMode;
050   private boolean stripTrailingZeros;
051
052   /**
053    * Instantiates a new amount rounding adapter.
054    */
055   public TwoDigitRoundingAdapter() {
056      String name = this.getClass().getName();
057      scale = parseInt(Configuration.INSTANCE.getProperty(name + ".scale", getDefaultScale()));
058      roundingMode = valueOf(Configuration.INSTANCE.getProperty(name + ".roundingMode", DEFAULT_ROUNDING_MODE));
059      stripTrailingZeros = Configuration.INSTANCE.stripTrailingZeros();
060   }
061
062   protected String getDefaultScale() {
063      return DEFAULT_SCALE;
064   }
065
066   @Override
067   public Amount unmarshal(Amount amount) throws Exception {
068      return amount;
069   }
070
071   @Override
072   public Amount marshal(Amount amount) throws Exception {
073      if (amount == null || amount.getValue() == null) { return amount; }
074      return amount.setValue(round(amount));
075   }
076
077   private BigDecimal round(Amount amount) {
078      BigDecimal rounded = amount.getValue().setScale(scale, roundingMode);
079      if (stripTrailingZeros) { return rounded.stripTrailingZeros(); }
080      return rounded;
081   }
082}