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