DateTimeAdapter.java

/**
 * Copyright (c) Codice Foundation
 * <p>
 * This is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser
 * General Public License as published by the Free Software Foundation, either version 3 of the
 * License, or any later version.
 * <p>
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details. A copy of the GNU Lesser General Public License
 * is distributed along with this program and can be found at
 * <http://www.gnu.org/licenses/lgpl.html>.
 */
package ddf.catalog.transformer.xml.adapter;

import java.io.Serializable;
import java.util.Date;
import java.util.GregorianCalendar;

import javax.xml.bind.annotation.adapters.XmlAdapter;
import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import ddf.catalog.data.Attribute;
import ddf.catalog.data.impl.AttributeImpl;
import ddf.catalog.transformer.xml.binding.DateTimeElement;

public class DateTimeAdapter extends XmlAdapter<DateTimeElement, Attribute> {

    private static final Logger LOGGER = LoggerFactory.getLogger(DateTimeAdapter.class);

    public static DateTimeElement marshalFrom(Attribute attribute) {

        DateTimeElement element = new DateTimeElement();
        element.setName(attribute.getName());
        if (attribute.getValue() != null) {
            for (Serializable value : attribute.getValues()) {
                if (!(value instanceof Date)) {
                    continue;
                }
                Date date = (Date) value;
                GregorianCalendar cal = new GregorianCalendar();
                cal.setTime(date);
                try {
                    ((DateTimeElement) element).getValue()
                            .add(DatatypeFactory.newInstance()
                                    .newXMLGregorianCalendar(cal));
                } catch (DatatypeConfigurationException e) {
                    LOGGER.debug(
                            "Could not parse Metacard Attribute. XML Date could not be generated.",
                            e);
                }
            }
        }
        return element;
    }

    public static Attribute unmarshalFrom(DateTimeElement element) {
        AttributeImpl attribute = null;
        for (XMLGregorianCalendar xcal : element.getValue()) {
            Date date = xcal.toGregorianCalendar()
                    .getTime();
            if (attribute == null) {
                attribute = new AttributeImpl(element.getName(), date);
            } else {
                attribute.addValue(date);
            }
        }
        return attribute;
    }

    @Override
    public DateTimeElement marshal(Attribute attribute) {
        return marshalFrom(attribute);
    }

    @Override
    public Attribute unmarshal(DateTimeElement element) {
        return unmarshalFrom(element);
    }

}