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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.

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package org.bouncycastle.asn1.cmc;

import org.bouncycastle.asn1.ASN1Boolean;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.crmf.CertTemplate;

/**
 *  * id-cmc-modCertTemplate OBJECT IDENTIFIER ::= {id-cmc 31}
 *
 * ModCertTemplate ::= SEQUENCE {
 *    pkiDataReference             BodyPartPath,
 *    certReferences               BodyPartList,
 *    replace                      BOOLEAN DEFAULT TRUE,
 *    certTemplate                 CertTemplate
 * }
 * 
 */
public class ModCertTemplate
    extends ASN1Object
{
    private final BodyPartPath pkiDataReference;
    private final BodyPartList certReferences;
    private final boolean replace;
    private final CertTemplate certTemplate;

    public ModCertTemplate(BodyPartPath pkiDataReference, BodyPartList certReferences, boolean replace, CertTemplate certTemplate)
    {
        this.pkiDataReference = pkiDataReference;
        this.certReferences = certReferences;
        this.replace = replace;
        this.certTemplate = certTemplate;
    }

    private ModCertTemplate(ASN1Sequence seq)
    {
        if (seq.size() != 4 && seq.size() != 3)
        {
            throw new IllegalArgumentException("incorrect sequence size");
        }
        this.pkiDataReference = BodyPartPath.getInstance(seq.getObjectAt(0));
        this.certReferences = BodyPartList.getInstance(seq.getObjectAt(1));

        if (seq.size() == 4)
        {
            this.replace = ASN1Boolean.getInstance(seq.getObjectAt(2)).isTrue();
            this.certTemplate = CertTemplate.getInstance(seq.getObjectAt(3));
        }
        else
        {
            this.replace = true;
            this.certTemplate = CertTemplate.getInstance(seq.getObjectAt(2));
        }
    }

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

        if (o != null)
        {
            return new ModCertTemplate(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    public BodyPartPath getPkiDataReference()
    {
        return pkiDataReference;
    }

    public BodyPartList getCertReferences()
    {
        return certReferences;
    }

    public boolean isReplacingFields()
    {
        return replace;
    }

    public CertTemplate getCertTemplate()
    {
        return certTemplate;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(4);

        v.add(pkiDataReference);
        v.add(certReferences);
        if (!replace)
        {
            v.add(ASN1Boolean.getInstance(replace));
        }
        v.add(certTemplate);

        return new DERSequence(v);
    }
}