Move MessageInfoHolder comparator to MessageProvider

import com.fsck.k9.Preferences;

import com.fsck.k9.activity.FolderInfoHolder;

import com.fsck.k9.activity.MessageInfoHolder;

import com.fsck.k9.activity.MessageList;

import com.fsck.k9.controller.MessagingController;

import com.fsck.k9.controller.MessagingListener;

import com.fsck.k9.fragment.MessageListFragment;

import com.fsck.k9.helper.MessageHelper;

import com.fsck.k9.mail.Flag;

import com.fsck.k9.mail.Folder;

import java.lang.ref.WeakReference;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.LinkedHashMap;

import java.util.List;

import java.util.concurrent.BlockingQueue;

            final List<MessageInfoHolder> holders = queue.take();

            // TODO add sort order parameter

            Collections.sort(holders, new MessageListFragment.ReverseComparator<MessageInfoHolder>(

                                 new MessageListFragment.DateComparator()));

            Collections.sort(holders, new ReverseDateComparator());

            final String[] projectionToUse;

            if (projection == null) {

        mUriMatcher.addURI(AUTHORITY, handler.getPath(), code);

    }

    public static class ReverseDateComparator implements Comparator<MessageInfoHolder> {

        @Override

        public int compare(MessageInfoHolder object2, MessageInfoHolder object1) {

            if (object1.compareDate == null) {

                return (object2.compareDate == null ? 0 : 1);

            } else if (object2.compareDate == null) {

                return -1;

            } else {

                return object1.compareDate.compareTo(object2.compareDate);

            }

        }

    }

}