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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.cert.ocsp;

import java.util.Date;
import java.util.List;
import java.util.Set;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ocsp.CertStatus;
import org.bouncycastle.asn1.ocsp.RevokedInfo;
import org.bouncycastle.asn1.ocsp.SingleResponse;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.Extensions;

public class SingleResp
{
    private SingleResponse  resp;
    private Extensions extensions;

    public SingleResp(
        SingleResponse  resp)
    {
        this.resp = resp;
        this.extensions = resp.getSingleExtensions();
    }

    public CertificateID getCertID()
    {
        return new CertificateID(resp.getCertID());
    }

    /**
     * Return the status object for the response - null indicates good.
     * 
     * @return the status object for the response, null if it is good.
     */
    public CertificateStatus getCertStatus()
    {
        CertStatus  s = resp.getCertStatus();

        if (s.getTagNo() == 0)
        {
            return null;            // good
        }
        else if (s.getTagNo() == 1)
        {
            return new RevokedStatus(RevokedInfo.getInstance(s.getStatus()));
        }

        return new UnknownStatus();
    }

    public Date getThisUpdate()
    {
        return OCSPUtils.extractDate(resp.getThisUpdate());
    }

    /**
     * return the NextUpdate value - note: this is an optional field so may
     * be returned as null.
     *
     * @return nextUpdate, or null if not present.
     */
    public Date getNextUpdate()
    {
        if (resp.getNextUpdate() == null)
        {
            return null;
        }

        return OCSPUtils.extractDate(resp.getNextUpdate());
    }

    public boolean hasExtensions()
    {
        return extensions != null;
    }

    public Extension getExtension(ASN1ObjectIdentifier oid)
    {
        if (extensions != null)
        {
            return extensions.getExtension(oid);
        }

        return null;
    }

    public List getExtensionOIDs()
    {
        return OCSPUtils.getExtensionOIDs(extensions);
    }

    public Set getCriticalExtensionOIDs()
    {
        return OCSPUtils.getCriticalExtensionOIDs(extensions);
    }

    public Set getNonCriticalExtensionOIDs()
    {
        return OCSPUtils.getNonCriticalExtensionOIDs(extensions);
    }
}