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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.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.bouncycastle.asn1.ASN1GeneralizedTime;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.cert.X509CertificateHolder;

class OCSPUtils
{
    static final X509CertificateHolder[] EMPTY_CERTS = new X509CertificateHolder[0];

    static Set EMPTY_SET = Collections.unmodifiableSet(new HashSet());
    static List EMPTY_LIST = Collections.unmodifiableList(new ArrayList());

    static Date extractDate(ASN1GeneralizedTime time)
    {
        try
        {
            return time.getDate();
        }
        catch (Exception e)
        {
            throw new IllegalStateException("exception processing GeneralizedTime: " + e.getMessage());
        }
    }

    static Set getCriticalExtensionOIDs(Extensions extensions)
    {
        if (extensions == null)
        {
            return EMPTY_SET;
        }

        return Collections.unmodifiableSet(new HashSet(Arrays.asList(extensions.getCriticalExtensionOIDs())));
    }

    static Set getNonCriticalExtensionOIDs(Extensions extensions)
    {
        if (extensions == null)
        {
            return EMPTY_SET;
        }

        // TODO: should probably produce a set that imposes correct ordering
        return Collections.unmodifiableSet(new HashSet(Arrays.asList(extensions.getNonCriticalExtensionOIDs())));
    }

    static List getExtensionOIDs(Extensions extensions)
    {
        if (extensions == null)
        {
            return EMPTY_LIST;
        }

        return Collections.unmodifiableList(Arrays.asList(extensions.getExtensionOIDs()));
    }
}