ContentHints.cs :  » PDF » iTextSharp » Org » BouncyCastle » Asn1 » Ess » C# / CSharp Open Source

using System;

namespace Org.BouncyCastle.Asn1.Ess{
  public class ContentHints
    : Asn1Encodable
  {
    private readonly DerUtf8String contentDescription;
    private readonly DerObjectIdentifier contentType;

    public static ContentHints GetInstance(
      object o)
    {
      if (o == null || o is ContentHints)
      {
        return (ContentHints)o;
      }

      if (o is Asn1Sequence)
      {
        return new ContentHints((Asn1Sequence)o);
      }

      throw new ArgumentException("unknown object in 'ContentHints' factory : "
        + o.GetType().Name + ".");
    }

    /**
     * constructor
     */
    private ContentHints(
      Asn1Sequence seq)
    {
      IAsn1Convertible field = seq[0];
      if (field.ToAsn1Object() is DerUtf8String)
      {
        contentDescription = DerUtf8String.GetInstance(field);
        contentType = DerObjectIdentifier.GetInstance(seq[1]);
      }
      else
      {
        contentType = DerObjectIdentifier.GetInstance(seq[0]);
      }
    }

    public ContentHints(
      DerObjectIdentifier contentType)
    {
      this.contentType = contentType;
      this.contentDescription = null;
    }

    public ContentHints(
      DerObjectIdentifier  contentType,
      DerUtf8String    contentDescription)
    {
      this.contentType = contentType;
      this.contentDescription = contentDescription;
    }

    public DerObjectIdentifier ContentType
    {
      get { return contentType; }
    }

    public DerUtf8String ContentDescription
    {
      get { return contentDescription; }
    }

    /**
     * <pre>
     * ContentHints ::= SEQUENCE {
     *   contentDescription UTF8String (SIZE (1..MAX)) OPTIONAL,
     *   contentType ContentType }
     * </pre>
     */
    public override Asn1Object ToAsn1Object()
    {
      Asn1EncodableVector v = new Asn1EncodableVector();

      if (contentDescription != null)
      {
        v.Add(contentDescription);
      }

      v.Add(contentType);

      return new DerSequence(v);
    }
  }
}