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 * or more contributor license agreements.  See the NOTICE file *
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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
 * with the License.  You may obtain a copy of the License at   *
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 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
 * KIND, either express or implied.  See the License for the    *
 * specific language governing permissions and limitations      *
 * under the License.                                           *
 ****************************************************************/

package org.apache.james.pop3server.core;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import javax.mail.MessagingException;

import org.apache.james.imap.mailbox.MailboxException;
import org.apache.james.imap.mailbox.MailboxSession;
import org.apache.james.imap.mailbox.MessageRange;
import org.apache.james.imap.mailbox.MessageResult;
import org.apache.james.imap.mailbox.MessageResult.FetchGroup;
import org.apache.james.imap.mailbox.util.FetchGroupImpl;
import org.apache.james.pop3server.POP3Response;
import org.apache.james.pop3server.POP3Session;
import org.apache.james.protocols.api.CommandHandler;
import org.apache.james.protocols.api.Request;
import org.apache.james.protocols.api.Response;

/**
 * Handles LIST command
 */
public class ListCmdHandler implements CommandHandler<POP3Session> {

    /**
     * Handler method called upon receipt of a LIST command. Returns the number
     * of messages in the mailbox and its aggregate size, or optionally, the
     * number and size of a single message.
     * 
     * @param argument
     *            the first argument parsed by the parseCommand method
     */

    public Response onCommand(POP3Session session, Request request) {
        POP3Response response = null;
        String parameters = request.getArgument();
        List<Long> uidList = (List<Long>) session.getState().get(POP3Session.UID_LIST);
        List<Long> deletedUidList = (List<Long>) session.getState().get(POP3Session.DELETED_UID_LIST);

        MailboxSession mailboxSession = (MailboxSession) session.getState().get(POP3Session.MAILBOX_SESSION);
        if (session.getHandlerState() == POP3Session.TRANSACTION) {
            if (parameters == null) {

                try {
                    long size = 0;
                    int count = 0;
                    List<MessageResult> validResults = new ArrayList<MessageResult>();

                    if (uidList.isEmpty() == false) {
                        Iterator<MessageResult> results;
                        if (uidList.size() > 1) {
                            results = session.getUserMailbox().getMessages(MessageRange.range(uidList.get(0), uidList.get(uidList.size() - 1)), new FetchGroupImpl(FetchGroup.MINIMAL), mailboxSession);
                        } else {
                            results = session.getUserMailbox().getMessages(MessageRange.one(uidList.get(0)), new FetchGroupImpl(FetchGroup.MINIMAL), mailboxSession);
                        }

                        while (results.hasNext()) {
                            MessageResult result = results.next();
                            if (deletedUidList.contains(result.getUid()) == false) {
                                size += result.getSize();
                                count++;
                                validResults.add(result);
                            }
                        }
                    }
                    StringBuilder responseBuffer = new StringBuilder(32).append(count).append(" ").append(size);
                    response = new POP3Response(POP3Response.OK_RESPONSE, responseBuffer.toString());
                    count = 0;
                    for (int i = 0; i < validResults.size(); i++) {
                        responseBuffer = new StringBuilder(16).append(i + 1).append(" ").append(validResults.get(i).getSize());
                        response.appendLine(responseBuffer.toString());

                    }
                    response.appendLine(".");
                } catch (MailboxException me) {
                    response = new POP3Response(POP3Response.ERR_RESPONSE);
                }
            } else {
                int num = 0;
                try {
                    num = Integer.parseInt(parameters);
                    Long uid = uidList.get(num - 1);
                    if (deletedUidList.contains(uid) != false) {
                        Iterator<MessageResult> results = session.getUserMailbox().getMessages(MessageRange.one(uid), new FetchGroupImpl(FetchGroup.MINIMAL), mailboxSession);

                        StringBuilder responseBuffer = new StringBuilder(64).append(num).append(" ").append(results.next().getSize());
                        response = new POP3Response(POP3Response.OK_RESPONSE, responseBuffer.toString());
                    } else {
                        StringBuilder responseBuffer = new StringBuilder(64).append("Message (").append(num).append(") already deleted.");
                        response = new POP3Response(POP3Response.ERR_RESPONSE, responseBuffer.toString());
                    }
                } catch (IndexOutOfBoundsException npe) {
                    StringBuilder responseBuffer = new StringBuilder(64).append("Message (").append(num).append(") does not exist.");
                    response = new POP3Response(POP3Response.ERR_RESPONSE, responseBuffer.toString());
                } catch (NumberFormatException nfe) {
                    StringBuilder responseBuffer = new StringBuilder(64).append(parameters).append(" is not a valid number");
                    response = new POP3Response(POP3Response.ERR_RESPONSE, responseBuffer.toString());
                } catch (MessagingException me) {
                    response = new POP3Response(POP3Response.ERR_RESPONSE);
                }
            }
        } else {
            response = new POP3Response(POP3Response.ERR_RESPONSE);
        }
        return response;
     }

    /*
     * (non-Javadoc)
     * @see org.apache.james.protocols.api.CommandHandler#getImplCommands()
     */
    public Collection<String> getImplCommands() {
        List<String> commands = new ArrayList<String>();
        commands.add("LIST");
        return commands;
    }

}

@@ -5112,9 +5112,9 @@
 id) 
-!
+=
 = fa

Fix LIST msgnum command (JAMES-1006)