com.bouncycastle.asn1.x509.TargetInformation Maven / Gradle / Ivy
package com.bouncycastle.asn1.x509;
import com.bouncycastle.asn1.ASN1Encodable;
import com.bouncycastle.asn1.ASN1Sequence;
import com.bouncycastle.asn1.DERObject;
import com.bouncycastle.asn1.DERSequence;
import java.util.Enumeration;
/**
* Target information extension for attributes certificates according to RFC
* 3281.
*
*
* SEQUENCE OF Targets
*
*
*/
public class TargetInformation
extends ASN1Encodable
{
private ASN1Sequence targets;
/**
* Creates an instance of a TargetInformation from the given object.
*
* obj 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 instanceof ASN1Sequence)
{
return new TargetInformation((ASN1Sequence) obj);
}
throw new IllegalArgumentException("unknown object in factory: "
+ obj.getClass());
}
/**
* 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:
*
*
* SEQUENCE OF Targets
*
*
*
* 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 ASN1Sequence} the encoding is kept.
*
* @return a DERObject
*/
public DERObject toASN1Object()
{
return targets;
}
}