JAXB Money

import java.io.File;
import java.math.BigDecimal;
import java.util.LinkedList;
import java.util.List;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

/**
 * Parses the
 * <a href="http://www.w3schools.com/xml/xml_examples.asp">Plant Catalog XML</a>
 * <br /><br />
 *
 * Shows one method of parsing money, if you're not able to break the currencies
 * and values out into separate XML elements.
 *
 * @author RedTeaHacker
 */
@XmlRootElement(name="CATALOG")
public class PlantXml {
  public static void main(String[] args) throws JAXBException {
    if(args.length < 1) {
      System.out.println("Usage:  java PlantXml <input_file> (<output_file>)");
      return;
    }

    // Read
    JAXBContext context = JAXBContext.newInstance(PlantXml.class);
    Unmarshaller unmarsh = context.createUnmarshaller();
    PlantXml plantXml = (PlantXml)unmarsh.unmarshal(new File(args[0]));

    // Output
    for(Plant plant: plantXml.plants) {
      System.out.printf("%20s |%25s |%7s |%13s |%6s |%7s\n"
        ,plant.common,plant.botanical,plant.zone,plant.light,plant.price,plant.availability);
    }

    if(args.length > 1) {
      // New
      plantXml = new PlantXml();
      plantXml.plants = new LinkedList<Plant>();
      plantXml.plants.add(new Plant("North Tower Flower","Lobelia cardinalis","99","Sunny",new Money("$",new BigDecimal("0.05")),"000001"));
      plantXml.plants.add(new Plant("Beethovenfoil","Potentilla","747","Shade",new Money("$",new BigDecimal("1000")),"011440"));

      // Write
      Marshaller marsh = context.createMarshaller();
      marsh.setProperty("jaxb.formatted.output",Boolean.TRUE);
      marsh.marshal(plantXml,new File(args[1]));
    }
  }

  @XmlElement(name="PLANT")
  public List<Plant> plants;

  public static class Plant {
    @XmlElement(name="COMMON")
    public String common;

    @XmlElement(name="BOTANICAL")
    public String botanical;

    @XmlElement(name="ZONE")
    public String zone;

    @XmlElement(name="LIGHT")
    public String light;

    @XmlElement(name="PRICE")
    @XmlJavaTypeAdapter(MoneyAdapter.class)
    public Money price;

    @XmlElement(name="AVAILABILITY")
    public String availability;

    public Plant() {
    }

    // Not necessary for JAXB, just helpful
    public Plant(String common,String botanical,String zone,String light,Money price,String availability) {
      this.common = common;
      this.botanical = botanical;
      this.zone = zone;
      this.light = light;
      this.price = price;
      this.availability = availability;
    }
  }

  public static class Money {
    public String currency = "$"; // Should probably use the Currency class
    public BigDecimal value = BigDecimal.ZERO;

    public Money() {
    }

    // Not necessary for JAXB, just helpful
    public Money(String currency,BigDecimal value) {
      this.currency = currency;
      this.value = value;
    }

    public String toString() {
      return currency + value.toPlainString();
    }
  }

  // You could combine this with the Money class
  public static class MoneyAdapter extends XmlAdapter<String,Money> {
    public String marshal(Money m) {
      return (m != null) ? m.toString() : "";
    }

    public Money unmarshal(String s) {
      Money m = new Money();

      // Currency
      StringBuilder b = new StringBuilder();
      int i = 0;
      for(; i < s.length(); ++i) {
        char c = s.charAt(i);
        if(Character.isWhitespace(c)) {
          continue; // ignore
        }
        if(Character.isDigit(c) || c == '-' || c == '.') {
          break; // done
        }
        b.append(c);
      }
      m.currency = b.toString();

      // Value
      b = new StringBuilder();
      for(; i < s.length(); ++i) {
        char c = s.charAt(i);
        if(!Character.isWhitespace(c)) {
          b.append(c);
        }
      }
      try {
        m.value = new BigDecimal(b.toString());
      }
      catch(Exception ex) {
        m.value = BigDecimal.ZERO;
      }

      return m;
    }
  }
}