Initial Commit

iTechSharp/srcbc/asn1/x509/TargetInformation.cs

@@ -0,0 +1,123 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+	/**
+	 * Target information extension for attributes certificates according to RFC
+	 * 3281.
+	 * 
+	 * <pre>
+	 *           SEQUENCE OF Targets
+	 * </pre>
+	 * 
+	 */
+	public class TargetInformation
+		: Asn1Encodable
+	{
+		private readonly Asn1Sequence targets;
+
+		/**
+		 * Creates an instance of a TargetInformation from the given object.
+		 * <p>
+		 * <code>obj</code> can be a TargetInformation or a {@link Asn1Sequence}</p>
+		 * 
+		 * @param obj The object.
+		 * @return A TargetInformation instance.
+		 * @throws ArgumentException if the given object cannot be interpreted as TargetInformation.
+		 */
+		public static TargetInformation GetInstance(
+			object obj)
+		{
+			if (obj is TargetInformation)
+			{
+				return (TargetInformation) obj;
+			}
+
+			if (obj is Asn1Sequence)
+			{
+				return new TargetInformation((Asn1Sequence) obj);
+			}
+
+			throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
+		}
+
+		/**
+		 * Constructor from a Asn1Sequence.
+		 * 
+		 * @param seq The Asn1Sequence.
+		 * @throws ArgumentException if the sequence does not contain
+		 *             correctly encoded Targets elements.
+		 */
+		private TargetInformation(
+			Asn1Sequence targets)
+		{
+			this.targets = targets;
+		}
+
+		/**
+		 * Returns the targets in this target information extension.
+		 * <p>
+		 * The ArrayList is cloned before it is returned.</p>
+		 * 
+		 * @return Returns the targets.
+		 */
+		public virtual Targets[] GetTargetsObjects()
+		{
+			Targets[] result = new Targets[targets.Count];
+
+			for (int i = 0; i < targets.Count; ++i)
+			{
+				result[i] = Targets.GetInstance(targets[i]);
+			}
+
+			return result;
+		}
+
+		/**
+		 * Constructs a target information from a single targets element. 
+		 * According to RFC 3281 only one targets element must be produced.
+		 * 
+		 * @param targets A Targets instance.
+		 */
+		public TargetInformation(
+			Targets targets)
+		{
+			this.targets = new DerSequence(targets);
+		}
+
+		/**
+		 * According to RFC 3281 only one targets element must be produced. If
+		 * multiple targets are given they must be merged in
+		 * into one targets element.
+		 *
+		 * @param targets An array with {@link Targets}.
+		 */
+		public TargetInformation(
+			Target[] targets)
+			: this(new Targets(targets))
+		{
+		}
+
+		/**
+		 * Produce an object suitable for an Asn1OutputStream.
+		 * 
+		 * Returns:
+		 * 
+		 * <pre>
+		 *          SEQUENCE OF Targets
+		 * </pre>
+		 * 
+		 * <p>
+		 * According to RFC 3281 only one targets element must be produced. If
+		 * multiple targets are given in the constructor they are merged into one
+		 * targets element. If this was produced from a
+		 * {@link Org.BouncyCastle.Asn1.Asn1Sequence} the encoding is kept.</p>
+		 * 
+		 * @return an Asn1Object
+		 */
+		public override Asn1Object ToAsn1Object()
+		{
+			return targets;
+		}
+	}
+}