XmlParser.java

package com.urise.webapp.util;

import javax.xml.bind.*;
import java.io.Reader;
import java.io.Writer;

public class XmlParser {
    private final Marshaller marshaller;
    private final Unmarshaller unmarshaller;

    public XmlParser (Class... classesToBeBound){
        try{
            JAXBContext ctx=JAXBContext.newInstance(classesToBeBound);
            marshaller=ctx.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,true);
            marshaller.setProperty(Marshaller.JAXB_ENCODING,"UTF-8");
            unmarshaller=ctx.createUnmarshaller();
        } catch (JAXBException e) {
            throw new IllegalStateException(e);
        }
    }

    public <T> T unmarshall (Reader reader){
        try{
            return (T) unmarshaller.unmarshal(reader);
        } catch (JAXBException e) {
            throw new IllegalStateException(e);
        }
    }
    public void marshall (Object instance, Writer writer){
        try{
            marshaller.marshal(instance, writer);
        } catch (JAXBException e) {
            throw new IllegalStateException(e);
        }
    }
}