PseudonymSerializerBest.java

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//* IBM                                                               *
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//* eu.abc4trust.pabce.1.34                                           *
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package eu.abc4trust.cryptoEngine.user;

import java.net.URI;
import java.util.ArrayList;
import java.util.List;

import eu.abc4trust.smartcard.CardStorage;
import eu.abc4trust.xml.PseudonymWithMetadata;

/**
 * This class chooses the best pseudonym serializer.
 * @author enr
 *
 */
public class PseudonymSerializerBest extends AbstractPseudonymSerializer {

	private final CardStorage cardStorage;
	
	public PseudonymSerializerBest(CardStorage cardStorage){
		this.cardStorage = cardStorage;
	}
	
	@Override
	public CardStorage getCardStorage(){
		return this.cardStorage;
	}
	
  private List<PseudonymSerializer> getClasses() {
    List<PseudonymSerializer> cslist = new ArrayList<PseudonymSerializer>();
    cslist.add(new PseudonymSerializerXml(this.getCardStorage()));
    cslist.add(new PseudonymSerializerGzipXml(this.getCardStorage()));
    cslist.add(new PseudonymSerializerObject(this.getCardStorage()));
    cslist.add(new PseudonymSerializerObjectGzip(this.getCardStorage()));
    return cslist;
  }
  
  @Override
  public byte[] serializePseudonym(PseudonymWithMetadata pwm) {
	  if(pwm.getPseudonym().isExclusive()){
		  return this.serializeExclusivePseudonym(pwm);
	  }
	  
    byte[] best = null;
    for(PseudonymSerializer ps: getClasses()) {
      byte[] ser = ps.serializePseudonym(pwm);
      if(best == null || best.length > ser.length) {
        best = ser;
      }
    }
    return best;
  }

  @Override
  public PseudonymWithMetadata unserializePseudonym(byte[] data, URI pseudonymUID) {
    PseudonymWithMetadata pwm;
    int magicHeader = data[0];

    if (magicHeader == this.magicHeaderForScopeExclusive()) {
      return this.unserializeExclusivePseudonym(data, pseudonymUID);
    }

    for (PseudonymSerializer ps : getClasses()) {
      if (magicHeader == ps.magicHeader()) {
        return ps.unserializePseudonym(data, pseudonymUID);
      }
    }
    throw new RuntimeException("Unable to unserialize the pseudonym");
  }

  @Override
  public int magicHeader() {
    return 64;
  }

}