PolicyQualifierInfo.cs :  » PDF » iTextSharp » Org » BouncyCastle » Asn1 » X509 » C# / CSharp Open Source

using System;

namespace Org.BouncyCastle.Asn1.X509{
  /**
   * Policy qualifiers, used in the X509V3 CertificatePolicies
   * extension.
   *
   * <pre>
   *   PolicyQualifierInfo ::= Sequence {
   *       policyQualifierId  PolicyQualifierId,
   *       qualifier          ANY DEFINED BY policyQualifierId }
   * </pre>
   */
  public class PolicyQualifierInfo
    : Asn1Encodable
  {
    internal readonly DerObjectIdentifier  policyQualifierId;
    internal readonly Asn1Encodable      qualifier;

    /**
     * Creates a new <code>PolicyQualifierInfo</code> instance.
     *
     * @param policyQualifierId a <code>PolicyQualifierId</code> value
     * @param qualifier the qualifier, defined by the above field.
     */
    public PolicyQualifierInfo(
      DerObjectIdentifier  policyQualifierId,
      Asn1Encodable    qualifier)
    {
      this.policyQualifierId = policyQualifierId;
      this.qualifier = qualifier;
    }

    /**
     * Creates a new <code>PolicyQualifierInfo</code> containing a
     * cPSuri qualifier.
     *
     * @param cps the CPS (certification practice statement) uri as a
     * <code>string</code>.
     */
    public PolicyQualifierInfo(
      string cps)
    {
      policyQualifierId = PolicyQualifierID.IdQtCps;
      qualifier = new DerIA5String(cps);
    }

    /**
     * Creates a new <code>PolicyQualifierInfo</code> instance.
     *
     * @param as <code>PolicyQualifierInfo</code> X509 structure
     * encoded as an Asn1Sequence.
     */
    private PolicyQualifierInfo(
      Asn1Sequence seq)
    {
      if (seq.Count != 2)
        throw new ArgumentException("Bad sequence size: " + seq.Count, "seq");

      policyQualifierId = DerObjectIdentifier.GetInstance(seq[0]);
      qualifier = seq[1];
    }

    public static PolicyQualifierInfo GetInstance(
      object obj)
    {
      if (obj is PolicyQualifierInfo)
      {
        return (PolicyQualifierInfo) obj;
      }

      if (obj is Asn1Sequence)
      {
        return new PolicyQualifierInfo((Asn1Sequence) obj);
      }

      throw new ArgumentException("unknown object in GetInstance: " + obj.GetType().FullName, "obj");
    }

    /**
     * Returns a Der-encodable representation of this instance.
     *
     * @return a <code>Asn1Object</code> value
     */
    public override Asn1Object ToAsn1Object()
    {
      return new DerSequence(policyQualifierId, qualifier);
    }
  }
}