package eu.dnetlib.iis.utils.contents;

import java.security.MessageDigest;

/**
 * @author Mateusz Kobos
 */
public class Utils {
	
	/** Conversion function based on the code provided by Antonis. 
	 * In future this should be replaced with a reference to some library code 
	 * available in d-net. */
	public static String convertToOpenAIREId(String sourcePrefix, 
			String extendedOriginalIdPrefix, String originalId) {
		try {
			String extendedId = extendedOriginalIdPrefix + originalId;
			MessageDigest md = MessageDigest.getInstance("MD5");
			md.update(extendedId.getBytes("UTF-8"));
			String md5String = new String(
					org.apache.commons.codec.binary.Hex.encodeHex(md.digest()));
			String prefix = "50|" + sourcePrefix;
			return prefix+md5String;
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}
}