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using System;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.X509
{
/**
* Target structure used in target information extension for attribute
* certificates from RFC 3281.
*
* <pre>
* Target ::= CHOICE {
* targetName [0] GeneralName,
* targetGroup [1] GeneralName,
* targetCert [2] TargetCert
* }
* </pre>
*
* <p>
* The targetCert field is currently not supported and must not be used
* according to RFC 3281.</p>
*/
public class Target
: Asn1Encodable, IAsn1Choice
{
public enum Choice
{
Name = 0,
Group = 1
};
private readonly GeneralName targetName;
private readonly GeneralName targetGroup;
/**
* Creates an instance of a Target from the given object.
* <p>
* <code>obj</code> can be a Target or a {@link Asn1TaggedObject}</p>
*
* @param obj The object.
* @return A Target instance.
* @throws ArgumentException if the given object cannot be
* interpreted as Target.
*/
public static Target GetInstance(
object obj)
{
if (obj is Target)
{
return (Target) obj;
}
if (obj is Asn1TaggedObject)
{
return new Target((Asn1TaggedObject) obj);
}
throw new ArgumentException("unknown object in factory: " + Platform.GetTypeName(obj), "obj");
}
/**
* Constructor from Asn1TaggedObject.
*
* @param tagObj The tagged object.
* @throws ArgumentException if the encoding is wrong.
*/
private Target(
Asn1TaggedObject tagObj)
{
switch ((Choice) tagObj.TagNo)
{
case Choice.Name: // GeneralName is already a choice so explicit
targetName = GeneralName.GetInstance(tagObj, true);
break;
case Choice.Group:
targetGroup = GeneralName.GetInstance(tagObj, true);
break;
default:
throw new ArgumentException("unknown tag: " + tagObj.TagNo);
}
}
/**
* Constructor from given details.
* <p>
* Exactly one of the parameters must be not <code>null</code>.</p>
*
* @param type the choice type to apply to the name.
* @param name the general name.
* @throws ArgumentException if type is invalid.
*/
public Target(
Choice type,
GeneralName name)
: this(new DerTaggedObject((int) type, name))
{
}
/**
* @return Returns the targetGroup.
*/
public virtual GeneralName TargetGroup
{
get { return targetGroup; }
}
/**
* @return Returns the targetName.
*/
public virtual GeneralName TargetName
{
get { return targetName; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
*
* Returns:
*
* <pre>
* Target ::= CHOICE {
* targetName [0] GeneralName,
* targetGroup [1] GeneralName,
* targetCert [2] TargetCert
* }
* </pre>
*
* @return an Asn1Object
*/
public override Asn1Object ToAsn1Object()
{
// GeneralName is a choice already so most be explicitly tagged
if (targetName != null)
{
return new DerTaggedObject(true, 0, targetName);
}
return new DerTaggedObject(true, 1, targetGroup);
}
}
}
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