java - How to check if a Calendar instance was originally a wrong date

Question

I have a Calendar instance, parsed from XSD datetime via the javax.xml.bind.DatatypeConverter.parseDateTime method by JAXB.

At runtime, i\'m in a web service, and i want

Answer 1

I solved my problem by using JodaTime's ISODateTimeFormat#dateTimeParser() and custom Adapter in a custom JAXB bindings file. JodaTime is much better API than the Calendar standard Java API, and it is non lenient by default.

I could have done the same for Calendar, but i should have defined all the formats myself, where JodaTime defines them already.

Here a code sample i made (it answers too to my other question: Check if xsd datetime had a defined timezone before conversion to Java object)

package com.app.adapter;
public class MyDatetimeAdapter extends XmlAdapter {
    private final static DateTimeFormatter DATETIME_FORMATTER = ISODateTimeFormat.dateTime();
    private final static Pattern TIMEZONE_PATTERN = Pattern.compile("(\\+|\\-)[0-9]{2}:[0-9]{2}$");
    @Override
    public DateTime unmarshal(String string) throws Exception {
        string = string.trim();
            try { 
            DateTime tmp = ISODateTimeFormat.dateTimeParser().parseDateTime(string);

            if (string.charAt(string.length()-1) == 'Z' || TIMEZONE_PATTERN.matcher(string).find()) {
                return new CustomDateTime(tmp);
            }
            return new CustomDateTime(tmp, CustomDateTime.Error.NO_TIMEZONE);
        } catch (IllegalArgumentException e) {
            return new CustomDateTime(null, CustomDateTime.Error.INVALID);
        }
    }

    @Override
    public String marshal(CustomDateTime date) throws Exception {
        return DATETIME_FORMATTER.print(date.getDateTime());
    }
}

And here's CustomDateTime (a POJO that wraps a JodaTime's DateTime and an error code)

package com.app.types;
public final class CustomDateTime {

    private DateTime dateTime;
    private Error error;

    // getter .. setters .. constructor

    public static CustomDateTime getInstance(Error error) {
        return new CustomDateTime(DateTime.now(), error);
    }

    public static CustomDateTime getInstance() {
        return getInstance(Error.NONE);
    }

    public enum Error {
        NONE,
        NO_TIMEZONE
        INVALID;
    }
}

And finally, the JAXB binding file.