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The Bouncy Castle Java CMS and S/MIME APIs for handling the CMS and S/MIME protocols. This jar contains CMS and S/MIME APIs for JDK 1.5. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs. If the S/MIME API is used, the JavaMail API and the Java activation framework will also be needed.

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package org.bouncycastle.cms;

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;

public class RecipientInformationStore
{
    private final ArrayList all; //ArrayList[RecipientInformation]
    private final Map       table = new HashMap(); // HashMap[RecipientID, ArrayList[RecipientInformation]]

    public RecipientInformationStore(
        Collection  recipientInfos)
    {
        Iterator it = recipientInfos.iterator();

        while (it.hasNext())
        {
            RecipientInformation recipientInformation = (RecipientInformation)it.next();
            RecipientId rid = recipientInformation.getRID();

            ArrayList list = (ArrayList)table.get(rid);
            if (list == null)
            {
                list = new ArrayList(1);
                table.put(rid, list);
            }

            list.add(recipientInformation);
        }

        this.all = new ArrayList(recipientInfos);
    }

    /**
     * Return the first RecipientInformation object that matches the
     * passed in selector. Null if there are no matches.
     *
     * @param selector to identify a recipient
     * @return a single RecipientInformation object. Null if none matches.
     */
    public RecipientInformation get(
        RecipientId selector)
    {
        ArrayList list = (ArrayList)table.get(selector);

        return list == null ? null : (RecipientInformation) list.get(0);
    }

    /**
     * Return the number of recipients in the collection.
     *
     * @return number of recipients identified.
     */
    public int size()
    {
        return all.size();
    }

    /**
     * Return all recipients in the collection
     *
     * @return a collection of recipients.
     */
    public Collection getRecipients()
    {
        return new ArrayList(all);
    }

    /**
     * Return possible empty collection with recipients matching the passed in RecipientId
     *
     * @param selector a recipient id to select against.
     * @return a collection of RecipientInformation objects.
     */
    public Collection getRecipients(
        RecipientId selector)
    {
        ArrayList list = (ArrayList)table.get(selector);

        return list == null ? new ArrayList() : new ArrayList(list);
    }
}