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package com.aeontronix.commons.xml.jaxb;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;

public class JAXBUtils {
    /**
     * Create a JAXB Unmarshaller for the specific object
     *
     * @param objClass Object Class
     * @return JAXB Unmarshaller
     * @throws JAXBException If an error occurs creating unmarshaller
     */
    public static  Unmarshaller createJAXBUnmarshaller(Class objClass) throws JAXBException {
        JAXBContext jaxbContext = JAXBContext.newInstance(objClass);
        return jaxbContext.createUnmarshaller();
    }

    /**
     * Convert a XML document to an object using JAXB.
     * This will automatically convert a context based on the object's class package
     *
     * @param objClass       JAXB object class
     * @param xmlInputStream xml input stream
     * @return JAXB object
     */
    public static  X xmlToObj(Class objClass, InputStream xmlInputStream) throws JAXBException {
        Unmarshaller unmarshaller = createJAXBUnmarshaller(objClass);
        return objClass.cast(unmarshaller.unmarshal(xmlInputStream));
    }

    /**
     * Convert a XML document to an object using JAXB.
     * This will automatically convert a context based on the object's class package
     *
     * @param objClass JAXB object class
     * @param xmlFile  XML File
     * @return JAXB object
     */
    public static  X xmlToObj(Class objClass, File xmlFile) throws JAXBException, IOException {
        JAXBContext jaxbContext = JAXBContext.newInstance(objClass);
        Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
        return objClass.cast(unmarshaller.unmarshal(xmlFile));
    }

}