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Diffstat (limited to 'src/org/jivesoftware/smack/filter/OrFilter.java')
-rw-r--r-- | src/org/jivesoftware/smack/filter/OrFilter.java | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/org/jivesoftware/smack/filter/OrFilter.java b/src/org/jivesoftware/smack/filter/OrFilter.java new file mode 100644 index 0000000..4c34fd0 --- /dev/null +++ b/src/org/jivesoftware/smack/filter/OrFilter.java @@ -0,0 +1,103 @@ +/** + * $RCSfile$ + * $Revision$ + * $Date$ + * + * Copyright 2003-2007 Jive Software. + * + * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.jivesoftware.smack.filter; + +import org.jivesoftware.smack.packet.Packet; + +/** + * Implements the logical OR operation over two or more packet filters. In + * other words, packets pass this filter if they pass <b>any</b> of the filters. + * + * @author Matt Tucker + */ +public class OrFilter implements PacketFilter { + + /** + * The current number of elements in the filter. + */ + private int size; + + /** + * The list of filters. + */ + private PacketFilter [] filters; + + /** + * Creates an empty OR filter. Filters should be added using the + * {@link #addFilter(PacketFilter)} method. + */ + public OrFilter() { + size = 0; + filters = new PacketFilter[3]; + } + + /** + * Creates an OR filter using the two specified filters. + * + * @param filter1 the first packet filter. + * @param filter2 the second packet filter. + */ + public OrFilter(PacketFilter filter1, PacketFilter filter2) { + if (filter1 == null || filter2 == null) { + throw new IllegalArgumentException("Parameters cannot be null."); + } + size = 2; + filters = new PacketFilter[2]; + filters[0] = filter1; + filters[1] = filter2; + } + + /** + * Adds a filter to the filter list for the OR operation. A packet + * will pass the filter if any filter in the list accepts it. + * + * @param filter a filter to add to the filter list. + */ + public void addFilter(PacketFilter filter) { + if (filter == null) { + throw new IllegalArgumentException("Parameter cannot be null."); + } + // If there is no more room left in the filters array, expand it. + if (size == filters.length) { + PacketFilter [] newFilters = new PacketFilter[filters.length+2]; + for (int i=0; i<filters.length; i++) { + newFilters[i] = filters[i]; + } + filters = newFilters; + } + // Add the new filter to the array. + filters[size] = filter; + size++; + } + + public boolean accept(Packet packet) { + for (int i=0; i<size; i++) { + if (filters[i].accept(packet)) { + return true; + } + } + return false; + } + + public String toString() { + return filters.toString(); + } +}
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