package proxy.config;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;

import com.fasterxml.jackson.databind.ObjectMapper;

public class Loader {

	private ExternalUrls externalUrls;
	
	
//	public static void main(String [] args) {
//		Loader l = new Loader("file:///home/nikolas/git/OpenAIRE-EUDAT-DMP/dmp-backend/src/main/resources/ExternalUrls.xml");
//	}
	
	
	public Loader(String fileUrl) {
		System.out.println("LOADING FILE: "+fileUrl);
		InputStream is = null;
		try {
			JAXBContext jaxbContext = JAXBContext.newInstance(ExternalUrls.class);
			Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
			is = new URL(fileUrl).openStream();
			externalUrls = (ExternalUrls) jaxbUnmarshaller.unmarshal(is);
			
			System.out.println(new ObjectMapper().writeValueAsString(externalUrls));
		}
		catch(Exception ex) {
			//log the error and shutdown the system (that's a critical error)
			ex.printStackTrace();
			System.exit(0);
		}
		finally {
			try {
				if(is !=null) is.close();
			} catch (IOException e) {
				System.out.println("Warning: Could not close a stream after reading from file: "+fileUrl);
			}		
		}
	}
	
	
	
}