001/** 002 * 003 * Copyright 2018 Miguel Hincapie. 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.jivesoftware.smackx.chat_markers.filter; 018 019import org.jivesoftware.smack.filter.StanzaExtensionFilter; 020import org.jivesoftware.smack.packet.ExtensionElement; 021import org.jivesoftware.smack.packet.Stanza; 022 023import org.jivesoftware.smackx.chatstates.ChatState; 024import org.jivesoftware.smackx.chatstates.ChatStateManager; 025 026/** 027 * Chat Markers Manager class (XEP-0333). 028 * 029 * @author Miguel Hincapie 030 * @see <a href="http://xmpp.org/extensions/xep-0333.html">XEP-0333: Chat 031 * Markers</a> 032 */ 033public final class EligibleForChatMarkerFilter extends StanzaExtensionFilter { 034 035 public static final EligibleForChatMarkerFilter INSTANCE = new EligibleForChatMarkerFilter(ChatStateManager.NAMESPACE); 036 037 private EligibleForChatMarkerFilter(String namespace) { 038 super(namespace); 039 } 040 041 /** 042 * From XEP-0333, Protocol Format: The Chat Marker MUST have an 'id' which is the 'id' of the 043 * message being marked.<br> 044 * In order to make Chat Markers works together with XEP-0085 as it said in 045 * 8.5 Interaction with Chat States, only messages with <code>active</code> chat 046 * state are accepted. 047 * 048 * @param message to be analyzed. 049 * @return true if the message contains a stanza Id. 050 * @see <a href="http://xmpp.org/extensions/xep-0333.html">XEP-0333: Chat Markers</a> 051 */ 052 @Override 053 public boolean accept(Stanza message) { 054 if (!message.hasStanzaIdSet()) { 055 return false; 056 } 057 058 if (super.accept(message)) { 059 ExtensionElement extension = message.getExtension(ChatStateManager.NAMESPACE); 060 String chatStateElementName = extension.getElementName(); 061 062 ChatState state; 063 try { 064 state = ChatState.valueOf(chatStateElementName); 065 return state == ChatState.active; 066 } 067 catch (Exception ex) { 068 return false; 069 } 070 } 071 072 return true; 073 } 074}