Class to get XKB keyboard models and layouts with JAXB

XkbConfigRegistry.java

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class XkbConfigRegistry {
	public static class Model {
		public static class ModelConfigItem {
			@XmlElement
			String name;

			@XmlElement
			String description;

			@XmlElement
			String vendor;
		}

		@XmlElement
		ModelConfigItem configItem;
	}

	public static class Layout {
		public static class LayoutConfigItem {
			@XmlElement
			String name;

			@XmlElement
			String description;
		}

		@XmlElement
		LayoutConfigItem configItem;
	}

	@XmlElementWrapper(name="modelList")
	@XmlElement(name="model")
	List<Model> modelList = new ArrayList<Model>();

	@XmlElementWrapper(name="layoutList")
	@XmlElement(name="layout")
	List<Layout> layoutList = new ArrayList<Layout>();

	private static XkbConfigRegistry instance = null;

	public static XkbConfigRegistry getXkbConfigRegistry() {
		if (instance == null) {
			try {
				JAXBContext jc = JAXBContext.newInstance(XkbConfigRegistry.class);

				Unmarshaller unmarshaller = jc.createUnmarshaller();
				File xml = new File("/usr/share/X11/xkb/rules/base.xml");
				instance = (XkbConfigRegistry) unmarshaller.unmarshal(xml);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}

		return instance;
	}
}