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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.pkix.jcajce;

import java.io.IOException;
import java.security.cert.Certificate;
import java.security.cert.X509CertSelector;
import java.security.cert.X509Certificate;

import org.bouncycastle.util.Selector;

/**
 * This class is a Selector implementation for X.509 certificates.
 * 
 * @see org.bouncycastle.util.Selector
 */
class X509CertStoreSelector
    extends X509CertSelector
    implements Selector
{
    public boolean match(Object obj)
    {
        if (!(obj instanceof X509Certificate))
        {
            return false;
        }

        X509Certificate other = (X509Certificate)obj;

        return super.match(other);
    }

    public boolean match(Certificate cert)
    {
        return match((Object)cert);
    }

    public Object clone()
    {
        X509CertStoreSelector selector = (X509CertStoreSelector)super.clone();

        return selector;
    }

    /**
     * Returns an instance of this from a X509CertSelector.
     *
     * @param selector A X509CertSelector instance.
     * @return An instance of an X509CertStoreSelector.
     * @exception IllegalArgumentException if selector is null or creation fails.
     */
    public static X509CertStoreSelector getInstance(X509CertSelector selector)
    {
        if (selector == null)
        {
            throw new IllegalArgumentException("cannot create from null selector");
        }
        X509CertStoreSelector cs = new X509CertStoreSelector();
        cs.setAuthorityKeyIdentifier(selector.getAuthorityKeyIdentifier());
        cs.setBasicConstraints(selector.getBasicConstraints());
        cs.setCertificate(selector.getCertificate());
        cs.setCertificateValid(selector.getCertificateValid());
        cs.setMatchAllSubjectAltNames(selector.getMatchAllSubjectAltNames());
        try
        {
            cs.setPathToNames(selector.getPathToNames());
            cs.setExtendedKeyUsage(selector.getExtendedKeyUsage());
            cs.setNameConstraints(selector.getNameConstraints());
            cs.setPolicy(selector.getPolicy());
            cs.setSubjectPublicKeyAlgID(selector.getSubjectPublicKeyAlgID());
            cs.setSubjectAlternativeNames(selector.getSubjectAlternativeNames());
        }
        catch (IOException e)
        {
            throw new IllegalArgumentException("error in passed in selector: " + e);
        }
        cs.setIssuer(selector.getIssuer());
        cs.setKeyUsage(selector.getKeyUsage());
        cs.setPrivateKeyValid(selector.getPrivateKeyValid());
        cs.setSerialNumber(selector.getSerialNumber());
        cs.setSubject(selector.getSubject());
        cs.setSubjectKeyIdentifier(selector.getSubjectKeyIdentifier());
        cs.setSubjectPublicKey(selector.getSubjectPublicKey());
        return cs;
    }

}