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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.cert.jcajce;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.spongycastle.util.CollectionStore;
import org.spongycastle.x509.X509AttributeCertificate;

/**
 * Class for storing Attribute Certificates for later lookup.
 * 
 * The class will convert X509AttributeCertificate objects into X509AttributeCertificateHolder objects.
 * 
 */
public class JcaAttrCertStore
    extends CollectionStore
{
    /**
     * Basic constructor.
     *
     * @param collection - initial contents for the store, this is copied.
     */
    public JcaAttrCertStore(Collection collection)
        throws IOException
    {
        super(convertCerts(collection));
    }

    public JcaAttrCertStore(X509AttributeCertificate attrCert)
        throws IOException
    {
        this(Collections.singletonList(attrCert));
    }

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

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

            if (o instanceof X509AttributeCertificate)
            {
                X509AttributeCertificate cert = (X509AttributeCertificate)o;

                list.add(new JcaX509AttributeCertificateHolder(cert));
            }
            else
            {
                list.add(o);
            }
        }

        return list;
    }
}