WonMessageEncoder.java

package won.protocol.message;

import org.apache.jena.query.Dataset;
import org.apache.jena.riot.Lang;
import org.apache.jena.riot.RDFDataMgr;

import java.io.StringWriter;

/**
 * User: ypanchenko
 * Date: 04.08.2014
 */
public class WonMessageEncoder
{
  public static String encodeAsJsonLd(WonMessage message) {
    return encode(message, Lang.JSONLD);
  }

  /**
   * Encodes the WonMessage object as serialized RDF in the given language.
   * If no WonMessage object is provided an empty string is returned.
   *
   * @param message <code>WonMessage</code> object which will be serialized
   * @param lang defines the serialization language
   * @return <code>String</code> containing the serialized RDF;
   * if no WonMessage is provided an empty string is returned
   */
  public static String encode(WonMessage message, Lang lang) {
    if (message == null)
      return "";
    StringWriter sw = new StringWriter();
    RDFDataMgr.write(sw, message.getCompleteDataset(), lang);
    return sw.toString();
  }

  public static Dataset encodeAsDataset(WonMessage wonMessage) {
    return wonMessage.getCompleteDataset();
  }
}