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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 org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERBMPString;
import org.bouncycastle.asn1.DERIA5String;
import org.bouncycastle.asn1.DERUTF8String;
import org.bouncycastle.asn1.DERVisibleString;
import org.bouncycastle.asn1.DERString;

/**
 * DisplayText class, used in
 * CertificatePolicies X509 V3 extensions (in policy qualifiers).
 *
 * It stores a string in a chosen encoding. 
 * 
 * DisplayText ::= CHOICE {
 *      ia5String        IA5String      (SIZE (1..200)),
 *      visibleString    VisibleString  (SIZE (1..200)),
 *      bmpString        BMPString      (SIZE (1..200)),
 *      utf8String       UTF8String     (SIZE (1..200)) }
 * 
 * @see PolicyQualifierInfo
 * @see PolicyInformation
 */
public class DisplayText 
    extends ASN1Encodable
    implements ASN1Choice
{
   /**
    * Constant corresponding to ia5String encoding. 
    *
    */
   public static final int CONTENT_TYPE_IA5STRING = 0;
   /**
    * Constant corresponding to bmpString encoding. 
    *
    */
   public static final int CONTENT_TYPE_BMPSTRING = 1;
   /**
    * Constant corresponding to utf8String encoding. 
    *
    */
   public static final int CONTENT_TYPE_UTF8STRING = 2;
   /**
    * Constant corresponding to visibleString encoding. 
    *
    */
   public static final int CONTENT_TYPE_VISIBLESTRING = 3;

   /**
    * Describe constant DISPLAY_TEXT_MAXIMUM_SIZE here.
    *
    */
   public static final int DISPLAY_TEXT_MAXIMUM_SIZE = 200;
   
   int contentType;
   DERString contents;
   
   /**
    * Creates a new DisplayText instance.
    *
    * @param type the desired encoding type for the text. 
    * @param text the text to store. Strings longer than 200
    * characters are truncated. 
    */
   public DisplayText (int type, String text) 
   {
      if (text.length() > DISPLAY_TEXT_MAXIMUM_SIZE)
      {
         // RFC3280 limits these strings to 200 chars
         // truncate the string
         text = text.substring (0, DISPLAY_TEXT_MAXIMUM_SIZE);
      }
     
      contentType = type;
      switch (type)
      {
         case CONTENT_TYPE_IA5STRING:
            contents = (DERString)new DERIA5String (text);
            break;
         case CONTENT_TYPE_UTF8STRING:
            contents = (DERString)new DERUTF8String(text);
            break;
         case CONTENT_TYPE_VISIBLESTRING:
            contents = (DERString)new DERVisibleString(text);
            break;
         case CONTENT_TYPE_BMPSTRING:
            contents = (DERString)new DERBMPString(text);
            break;
         default:
            contents = (DERString)new DERUTF8String(text);
            break;
      }
   }
   
   /**
    * Creates a new DisplayText instance.
    *
    * @param text the text to encapsulate. Strings longer than 200
    * characters are truncated. 
    */
   public DisplayText (String text) 
   {
      // by default use UTF8String
      if (text.length() > DISPLAY_TEXT_MAXIMUM_SIZE)
      {
         text = text.substring(0, DISPLAY_TEXT_MAXIMUM_SIZE);
      }
      
      contentType = CONTENT_TYPE_UTF8STRING;
      contents = new DERUTF8String(text);
   }

   /**
    * Creates a new DisplayText instance.
    * Useful when reading back a DisplayText class
    * from it's ASN1Encodable/DEREncodable form. 
    *
    * @param de a DEREncodable instance. 
    */
   public DisplayText(DERString de)
   {
      contents = de;
   }

   public static DisplayText getInstance(Object de) 
   {
      if (de instanceof DERString)
      {
          return new DisplayText((DERString)de);
      }
      else if (de instanceof DisplayText)
      {
          return (DisplayText)de;
      }

      throw new IllegalArgumentException("illegal object in getInstance");
   }

   public static DisplayText getInstance(
       ASN1TaggedObject obj,
       boolean          explicit)
   {
       return getInstance(obj.getObject()); // must be explicitly tagged
   }
   
   public DERObject toASN1Object() 
   {
      return (DERObject)contents;
   }

   /**
    * Returns the stored String object. 
    *
    * @return the stored text as a String. 
    */
   public String getString() 
   {
      return contents.getString();
   }   
}