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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.bouncycastle.asn1.x509;

import java.util.Enumeration;
import java.util.Vector;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERSequence;

/**
 * NoticeReference class, used in
 * CertificatePolicies X509 V3 extensions
 * (in policy qualifiers).
 * 
 *  *  NoticeReference ::= SEQUENCE {
 *      organization     DisplayText,
 *      noticeNumbers    SEQUENCE OF INTEGER }
 *
 *  
 * 
 * @see PolicyQualifierInfo
 * @see PolicyInformation
 */
public class NoticeReference 
    extends ASN1Encodable
{
   private DisplayText organization;
   private ASN1Sequence noticeNumbers;

   /**
    * Creates a new NoticeReference instance.
    *
    * @param orgName a String value
    * @param numbers a Vector value
    */
   public NoticeReference(
       String orgName,
       Vector numbers) 
   {
      organization = new DisplayText(orgName);

      Object o = numbers.elementAt(0);

      ASN1EncodableVector av = new ASN1EncodableVector();
      if (o instanceof Integer)
      {
         Enumeration it = numbers.elements();

         while (it.hasMoreElements())
         {
            Integer nm = (Integer) it.nextElement();
               DERInteger di = new DERInteger(nm.intValue());
            av.add (di);
         }
      }

      noticeNumbers = new DERSequence(av);
   }

   /**
    * Creates a new NoticeReference instance.
    *
    * @param orgName a String value
    * @param numbers an ASN1EncodableVector value
    */
   public NoticeReference(
       String orgName, 
       ASN1Sequence numbers) 
   {
       organization = new DisplayText (orgName);
       noticeNumbers = numbers;
   }

   /**
    * Creates a new NoticeReference instance.
    *
    * @param displayTextType an int value
    * @param orgName a String value
    * @param numbers an ASN1EncodableVector value
    */
   public NoticeReference(
       int displayTextType,
       String orgName,
       ASN1Sequence numbers) 
   {
       organization = new DisplayText(displayTextType, 
                                     orgName);
       noticeNumbers = numbers;
   }

   /**
    * Creates a new NoticeReference instance.
    * Useful for reconstructing a NoticeReference
    * instance from its encodable/encoded form. 
    *
    * @param as an ASN1Sequence value obtained from either
    * calling @{link toASN1Object()} for a NoticeReference
    * instance or from parsing it from a DER-encoded stream. 
    */
   public NoticeReference(
       ASN1Sequence as) 
   {
       organization = DisplayText.getInstance(as.getObjectAt(0));
       noticeNumbers = (ASN1Sequence) as.getObjectAt(1);
   }

   public static NoticeReference getInstance(
       Object as) 
   {
      if (as instanceof NoticeReference)
      {
          return (NoticeReference)as;
      }
      else if (as instanceof ASN1Sequence)
      {
          return new NoticeReference((ASN1Sequence)as);
      }

      throw new IllegalArgumentException("unknown object in getInstance.");
   }
   
   public DisplayText getOrganization()
   {
       return organization;
   }
   
   public ASN1Sequence getNoticeNumbers()
   {
       return noticeNumbers;
   }
   
   /**
    * Describe toASN1Object method here.
    *
    * @return a DERObject value
    */
   public DERObject toASN1Object() 
   {
      ASN1EncodableVector av = new ASN1EncodableVector();
      av.add (organization);
      av.add (noticeNumbers);
      return new DERSequence (av);
   }
}