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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction 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.

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package org.bouncycastle.est;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.pkcs.Attribute;

/**
 *  *    AttrOrOID ::= CHOICE (oid OBJECT IDENTIFIER, attribute Attribute }
 * 
 */
public class AttrOrOID
    extends ASN1Object
    implements ASN1Choice
{
    private final ASN1ObjectIdentifier oid;
    private final Attribute attribute;

    public AttrOrOID(ASN1ObjectIdentifier oid)
    {
        this.oid = oid;
        attribute = null;
    }

    public AttrOrOID(Attribute attribute)
    {
        this.oid = null;
        this.attribute = attribute;
    }

    public static AttrOrOID getInstance(
        Object obj)
    {
        if (obj instanceof AttrOrOID)
        {
            return (AttrOrOID)obj;
        }

        if (obj != null)
        {
            if (obj instanceof ASN1Encodable)
            {
                ASN1Encodable asn1Prim = ((ASN1Encodable)obj).toASN1Primitive();

                if (asn1Prim instanceof ASN1ObjectIdentifier)
                {
                    return new AttrOrOID(ASN1ObjectIdentifier.getInstance(asn1Prim));
                }
                if (asn1Prim instanceof ASN1Sequence)
                {
                    return new AttrOrOID(Attribute.getInstance(asn1Prim));
                }
            }
            if (obj instanceof byte[])
            {
                try
                {
                    return getInstance(ASN1Primitive.fromByteArray((byte[])obj));
                }
                catch (IOException e)
                {
                    throw new IllegalArgumentException("unknown encoding in getInstance()");
                }
            }
            throw new IllegalArgumentException("unknown object in getInstance(): " + obj.getClass().getName());
        }

        return null;
    }

    public boolean isOid()
    {
        return oid != null;
    }

    public ASN1ObjectIdentifier getOid()
    {
        return oid;
    }

    public Attribute getAttribute()
    {
        return attribute;
    }
    public ASN1Primitive toASN1Primitive()
    {
        if (oid != null)
        {
            return oid;
        }

        return attribute.toASN1Primitive();
    }
}