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package org.spongycastle.asn1.x509;
import java.util.Enumeration;
import org.spongycastle.asn1.ASN1Object;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.DERSequence;
/**
* Target information extension for attributes certificates according to RFC
* 3281.
*
* <pre>
* SEQUENCE OF Targets
* </pre>
*
*/
public class TargetInformation
extends ASN1Object
{
private ASN1Sequence targets;
/**
* Creates an instance of a TargetInformation from the given object.
* <p>
* <code>obj</code> can be a TargetInformation or a {@link ASN1Sequence}
*
* @param obj The object.
* @return A TargetInformation instance.
* @throws IllegalArgumentException if the given object cannot be
* interpreted as TargetInformation.
*/
public static TargetInformation getInstance(Object obj)
{
if (obj instanceof TargetInformation)
{
return (TargetInformation)obj;
}
else if (obj != null)
{
return new TargetInformation(ASN1Sequence.getInstance(obj));
}
return null;
}
/**
* Constructor from a ASN1Sequence.
*
* @param seq The ASN1Sequence.
* @throws IllegalArgumentException if the sequence does not contain
* correctly encoded Targets elements.
*/
private TargetInformation(ASN1Sequence seq)
{
targets = seq;
}
/**
* Returns the targets in this target information extension.
*
* @return Returns the targets.
*/
public Targets[] getTargetsObjects()
{
Targets[] copy = new Targets[targets.size()];
int count = 0;
for (Enumeration e = targets.getObjects(); e.hasMoreElements();)
{
copy[count++] = Targets.getInstance(e.nextElement());
}
return copy;
}
/**
* 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.spongycastle.asn1.ASN1Sequence} the encoding is kept.
*
* @return a ASN1Primitive
*/
public ASN1Primitive toASN1Primitive()
{
return targets;
}
}
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