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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.asn1.cmp;

import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.DistributionPointName;
import org.bouncycastle.asn1.x509.GeneralNames;

/**
 * GenMsg:    {id-it TBD1}, SEQUENCE SIZE (1..MAX) OF CRLStatus
 * GenRep:    {id-it TBD2}, SEQUENCE SIZE (1..MAX) OF
 * CertificateList  |  < absent >
 * 
 * CRLSource ::= CHOICE {
 * dpn          [0] DistributionPointName,
 * issuer       [1] GeneralNames }
 * 
 */
public class CRLSource
    extends ASN1Object
    implements ASN1Choice
{

    private final DistributionPointName dpn;
    private final GeneralNames issuer;

    private CRLSource(ASN1TaggedObject ato)
    {
        if (ato.getTagNo() == 0)
        {
            dpn = DistributionPointName.getInstance(ato, true);
            issuer = null;
        }
        else if (ato.getTagNo() == 1)
        {
            dpn = null;
            issuer = GeneralNames.getInstance(ato, true);
        }
        else
        {
            throw new IllegalArgumentException("unknown tag " + ato.getTagNo());
        }
    }

    public CRLSource(DistributionPointName dpn, GeneralNames issuer)
    {
        if ((dpn == null) == (issuer == null))
        {
            throw new IllegalArgumentException("either dpn or issuer must be set");
        }
        this.dpn = dpn;
        this.issuer = issuer;
    }

    public static CRLSource getInstance(Object o)
    {
        if (o instanceof CRLSource)
        {
            return (CRLSource)o;
        }

        if (o != null)
        {
            return new CRLSource(ASN1TaggedObject.getInstance(o));
        }

        return null;
    }

    public DistributionPointName getDpn()
    {
        return dpn;
    }

    public GeneralNames getIssuer()
    {
        return issuer;
    }

    public ASN1Primitive toASN1Primitive()
    {
        if (dpn != null)
        {
            return new DERTaggedObject(true, 0, dpn);
        }

        return new DERTaggedObject(true, 1, issuer);
    }
}