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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.jcajce;

import java.io.IOException;
import java.security.cert.CRLException;
import java.security.cert.X509CRL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import org.bouncycastle.cert.X509CRLHolder;
import org.bouncycastle.util.CollectionStore;

/**
 * Class for storing CRLs for later lookup.
 * 
 * The class will convert X509CRL objects into X509CRLHolder objects.
 * 
 */
public class JcaCRLStore
    extends CollectionStore
{
    /**
     * Basic constructor.
     *
     * @param collection - initial contents for the store, this is copied.
     */
    public JcaCRLStore(Collection collection)
        throws CRLException
    {
        super(convertCRLs(collection));
    }

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

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

            if (crl instanceof X509CRL)
            {
                try
                {
                    list.add(new X509CRLHolder(((X509CRL)crl).getEncoded()));
                }
                catch (IOException e)
                {
                    throw new CRLException("cannot read encoding: " + e.getMessage());
                    
                }
            }
            else
            {
                list.add((X509CRLHolder)crl);
            }
        }

        return list;
    }
}