Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | /** |
| 2 | * $RCSfile$ |
| 3 | * $Revision$ |
| 4 | * $Date$ |
| 5 | * |
| 6 | * Copyright 2003-2007 Jive Software. |
| 7 | * |
| 8 | * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); |
| 9 | * you may not use this file except in compliance with the License. |
| 10 | * You may obtain a copy of the License at |
| 11 | * |
| 12 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 13 | * |
| 14 | * Unless required by applicable law or agreed to in writing, software |
| 15 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 17 | * See the License for the specific language governing permissions and |
| 18 | * limitations under the License. |
| 19 | */ |
| 20 | |
| 21 | package org.jivesoftware.smack.filter; |
| 22 | |
| 23 | import org.jivesoftware.smack.packet.Packet; |
| 24 | |
| 25 | /** |
| 26 | * Implements the logical NOT operation on a packet filter. In other words, packets |
| 27 | * pass this filter if they do not pass the supplied filter. |
| 28 | * |
| 29 | * @author Matt Tucker |
| 30 | */ |
| 31 | public class NotFilter implements PacketFilter { |
| 32 | |
| 33 | private PacketFilter filter; |
| 34 | |
| 35 | /** |
| 36 | * Creates a NOT filter using the specified filter. |
| 37 | * |
| 38 | * @param filter the filter. |
| 39 | */ |
| 40 | public NotFilter(PacketFilter filter) { |
| 41 | if (filter == null) { |
| 42 | throw new IllegalArgumentException("Parameter cannot be null."); |
| 43 | } |
| 44 | this.filter = filter; |
| 45 | } |
| 46 | |
| 47 | public boolean accept(Packet packet) { |
| 48 | return !filter.accept(packet); |
| 49 | } |
| 50 | } |