SignaturePolicyIdentifier.cs :  » PDF » iTextSharp » Org » BouncyCastle » Asn1 » Esf » C# / CSharp Open Source

using System;

namespace Org.BouncyCastle.Asn1.Esf{
  /// <remarks>
  /// <code>
  /// SignaturePolicyIdentifier ::= CHOICE {
  ///    SignaturePolicyId    SignaturePolicyId,
  ///    SignaturePolicyImplied  SignaturePolicyImplied
  /// }
  /// 
  /// SignaturePolicyImplied ::= NULL
  /// </code>
  /// </remarks>
  public class SignaturePolicyIdentifier
    : Asn1Encodable, IAsn1Choice
  {
    private readonly SignaturePolicyId sigPolicy;

    public static SignaturePolicyIdentifier GetInstance(
      object obj)
    {
      if (obj == null || obj is SignaturePolicyIdentifier)
        return (SignaturePolicyIdentifier) obj;

      if (obj is SignaturePolicyId)
        return new SignaturePolicyIdentifier((SignaturePolicyId) obj);

      if (obj is Asn1Null)
        return new SignaturePolicyIdentifier();

      throw new ArgumentException(
        "Unknown object in 'SignaturePolicyIdentifier' factory: "
          + obj.GetType().Name,
        "obj");
    }

    public SignaturePolicyIdentifier()
    {
      this.sigPolicy = null;
    }

    public SignaturePolicyIdentifier(
      SignaturePolicyId signaturePolicyId)
    {
      if (signaturePolicyId == null)
        throw new ArgumentNullException("signaturePolicyId");

      this.sigPolicy = signaturePolicyId;
    }

    public SignaturePolicyId SignaturePolicyId
    {
      get { return sigPolicy; }
    }

    public override Asn1Object ToAsn1Object()
    {
      return sigPolicy == null
        ?  DerNull.Instance
        :  sigPolicy.ToAsn1Object();
    }
  }
}