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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.dane;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.spongycastle.util.CollectionStore;
import org.spongycastle.util.Selector;
import org.spongycastle.util.Store;
import org.spongycastle.util.StoreException;

/**
 * Class storing DANEEntry objects.
 */
public class DANEEntryStore
    implements Store
{
    private final Map entries;

    DANEEntryStore(List entries)
    {
        Map entryMap = new HashMap();

         for (Iterator it = entries.iterator(); it.hasNext();)
         {
             DANEEntry entry = (DANEEntry)it.next();

             entryMap.put(entry.getDomainName(), entry);
         }

        this.entries = Collections.unmodifiableMap(entryMap);
    }

    /**
     * Return a collection of entries matching the passed in selector.
     *
     * @param selector the selector to validate entries against.
     * @return a possibly empty collection of matched entries.
     * @throws StoreException in case of an underlying issue.
     */
    public Collection getMatches(Selector selector)
        throws StoreException
    {
        if (selector == null)
        {
            return entries.values();
        }

        List results = new ArrayList();

        for (Iterator it = entries.values().iterator(); it.hasNext();)
        {
            Object next = it.next();
            if (selector.match(next))
            {
                results.add(next);
            }
        }

        return Collections.unmodifiableList(results);
    }

    /**
     * Return a Store of X509CertificateHolder objects representing all the certificates associated with
     * entries in the store.
     *
     * @return a Store of X509CertificateHolder.
     */
    public Store toCertificateStore()
    {
        Collection col = this.getMatches(null);
        List certColl = new ArrayList(col.size());

        for (Iterator it = col.iterator(); it.hasNext();)
        {
            DANEEntry entry = (DANEEntry)it.next();

            certColl.add(entry.getCertificate());
        }

        return new CollectionStore(certColl);
    }
}