using System;

using Org.BouncyCastle.Utilities;

namespace Org.BouncyCastle.Asn1.Esf
{
	/// <remarks>
	/// <code>
	/// SigPolicyQualifierInfo ::= SEQUENCE {
    ///		sigPolicyQualifierId  SigPolicyQualifierId,
	///		sigQualifier          ANY DEFINED BY sigPolicyQualifierId
	/// }
	/// 
	/// SigPolicyQualifierId ::= OBJECT IDENTIFIER
	/// </code>
	/// </remarks>
	public class SigPolicyQualifierInfo
		: Asn1Encodable
	{
		private readonly DerObjectIdentifier	sigPolicyQualifierId;
		private readonly Asn1Object				sigQualifier;

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

			if (obj is Asn1Sequence)
				return new SigPolicyQualifierInfo((Asn1Sequence) obj);

			throw new ArgumentException(
				"Unknown object in 'SigPolicyQualifierInfo' factory: "
                    + Platform.GetTypeName(obj),
				"obj");
		}

		private SigPolicyQualifierInfo(
			Asn1Sequence seq)
		{
			if (seq == null)
				throw new ArgumentNullException("seq");
			if (seq.Count != 2)
				throw new ArgumentException("Bad sequence size: " + seq.Count, "seq");

			this.sigPolicyQualifierId = (DerObjectIdentifier) seq[0].ToAsn1Object();
			this.sigQualifier = seq[1].ToAsn1Object();
		}

		public SigPolicyQualifierInfo(
			DerObjectIdentifier	sigPolicyQualifierId,
			Asn1Encodable		sigQualifier)
		{
			this.sigPolicyQualifierId = sigPolicyQualifierId;
			this.sigQualifier = sigQualifier.ToAsn1Object();
		}

		public DerObjectIdentifier SigPolicyQualifierId
		{
			get { return sigPolicyQualifierId; }
		}

		public Asn1Object SigQualifier
		{
			get { return sigQualifier; }
		}

		public override Asn1Object ToAsn1Object()
		{
			return new DerSequence(sigPolicyQualifierId, sigQualifier);
		}
	}
}