http://www.bouncycastle.org/java.html: 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.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.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.bouncycastle.util.CollectionStore;
import org.bouncycastle.util.Selector;
import org.bouncycastle.util.Store;
import org.bouncycastle.util.StoreException;


Class storing DANEEntry objects.

/**
 * 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.

Params:
  • selector – the selector to validate entries against.
Throws:
Returns:a possibly empty collection of matched entries.
/**
     * 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.

Returns:a Store of X509CertificateHolder.
/**
     * 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);
    }
}