/** * Copyright (c) 2013, Redsolution LTD. All rights reserved. * * This file is part of Xabber project; you can redistribute it and/or * modify it under the terms of the GNU General Public License, Version 3. * * Xabber is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License, * along with this program. If not, see http://www.gnu.org/licenses/. */ package com.xabber.android.ui.adapter; import java.util.Comparator; import java.util.Date; import com.xabber.android.data.message.AbstractChat; public class ChatComparator implements Comparator<AbstractChat> { public static final ChatComparator CHAT_COMPARATOR = new ChatComparator(); @Override public int compare(AbstractChat chat1, AbstractChat chat2) { Date lastTime1 = chat1.getLastTime(); Date lastTime2 = chat2.getLastTime(); if (lastTime1 == null && lastTime2 == null) { return 0; } if (lastTime1 == null) { return 1; } if (lastTime2 == null) { return -1; } return -lastTime1.compareTo(lastTime2); } }