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 OR operation over two or more packet filters. In |
| 27 | * other words, packets pass this filter if they pass <b>any</b> of the filters. |
| 28 | * |
| 29 | * @author Matt Tucker |
| 30 | */ |
| 31 | public class OrFilter implements PacketFilter { |
| 32 | |
| 33 | /** |
| 34 | * The current number of elements in the filter. |
| 35 | */ |
| 36 | private int size; |
| 37 | |
| 38 | /** |
| 39 | * The list of filters. |
| 40 | */ |
| 41 | private PacketFilter [] filters; |
| 42 | |
| 43 | /** |
| 44 | * Creates an empty OR filter. Filters should be added using the |
| 45 | * {@link #addFilter(PacketFilter)} method. |
| 46 | */ |
| 47 | public OrFilter() { |
| 48 | size = 0; |
| 49 | filters = new PacketFilter[3]; |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Creates an OR filter using the two specified filters. |
| 54 | * |
| 55 | * @param filter1 the first packet filter. |
| 56 | * @param filter2 the second packet filter. |
| 57 | */ |
| 58 | public OrFilter(PacketFilter filter1, PacketFilter filter2) { |
| 59 | if (filter1 == null || filter2 == null) { |
| 60 | throw new IllegalArgumentException("Parameters cannot be null."); |
| 61 | } |
| 62 | size = 2; |
| 63 | filters = new PacketFilter[2]; |
| 64 | filters[0] = filter1; |
| 65 | filters[1] = filter2; |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Adds a filter to the filter list for the OR operation. A packet |
| 70 | * will pass the filter if any filter in the list accepts it. |
| 71 | * |
| 72 | * @param filter a filter to add to the filter list. |
| 73 | */ |
| 74 | public void addFilter(PacketFilter filter) { |
| 75 | if (filter == null) { |
| 76 | throw new IllegalArgumentException("Parameter cannot be null."); |
| 77 | } |
| 78 | // If there is no more room left in the filters array, expand it. |
| 79 | if (size == filters.length) { |
| 80 | PacketFilter [] newFilters = new PacketFilter[filters.length+2]; |
| 81 | for (int i=0; i<filters.length; i++) { |
| 82 | newFilters[i] = filters[i]; |
| 83 | } |
| 84 | filters = newFilters; |
| 85 | } |
| 86 | // Add the new filter to the array. |
| 87 | filters[size] = filter; |
| 88 | size++; |
| 89 | } |
| 90 | |
| 91 | public boolean accept(Packet packet) { |
| 92 | for (int i=0; i<size; i++) { |
| 93 | if (filters[i].accept(packet)) { |
| 94 | return true; |
| 95 | } |
| 96 | } |
| 97 | return false; |
| 98 | } |
| 99 | |
| 100 | public String toString() { |
| 101 | return filters.toString(); |
| 102 | } |
| 103 | } |