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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.cert.jcajce;

import java.io.IOException;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.util.CollectionStore;

/**
 * Class for storing Certificates for later lookup.
 * 
 * The class will convert X509Certificate objects into X509CertificateHolder objects.
 * 
 */
public class JcaCertStore
    extends CollectionStore
{
    /**
     * Basic constructor.
     *
     * @param collection - initial contents for the store, this is copied.
     */
    public JcaCertStore(Collection collection)
        throws CertificateEncodingException
    {
        super(convertCerts(collection));
    }

    private static Collection convertCerts(Collection collection)
        throws CertificateEncodingException
    {
        List list = new ArrayList(collection.size());

        for (Iterator it = collection.iterator(); it.hasNext();)
        {
            Object o = it.next();

            if (o instanceof X509Certificate)
            {
                X509Certificate cert = (X509Certificate)o;

                try
                {
                    list.add(new X509CertificateHolder(cert.getEncoded()));
                }
                catch (IOException e)
                {
                    throw new CertificateEncodingException("unable to read encoding: " + e.getMessage());
                }
            }
            else
            {
                list.add((X509CertificateHolder)o);
            }
        }

        return list;
    }
}