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| <?php | |
| /** | |
| * Licensed to the Apache Software Foundation (ASF) under one or more | |
| * contributor license agreements. See the NOTICE file distributed with | |
| * this work for additional information regarding copyright ownership. | |
| * The ASF licenses this file to You 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 log4php | |
| */ | |
| /** | |
| * Users should extend this class to implement customized logging | |
| * event filtering. Note that {@link LoggerCategory} and {@link LoggerAppender}, | |
| * the parent class of all standard | |
| * appenders, have built-in filtering rules. It is suggested that you | |
| * first use and understand the built-in rules before rushing to write | |
| * your own custom filters. | |
| * | |
| * <p>This abstract class assumes and also imposes that filters be | |
| * organized in a linear chain. The {@link #decide | |
| * decide(LoggerLoggingEvent)} method of each filter is called sequentially, | |
| * in the order of their addition to the chain. | |
| * | |
| * <p>The {@link decide()} method must return one | |
| * of the integer constants {@link LoggerFilter::DENY}, | |
| * {@link LoggerFilter::NEUTRAL} or {@link LoggerFilter::ACCEPT}. | |
| * | |
| * <p>If the value {@link LoggerFilter::DENY} is returned, then the log event is | |
| * dropped immediately without consulting with the remaining | |
| * filters. | |
| * | |
| * <p>If the value {@link LoggerFilter::NEUTRAL} is returned, then the next filter | |
| * in the chain is consulted. If there are no more filters in the | |
| * chain, then the log event is logged. Thus, in the presence of no | |
| * filters, the default behaviour is to log all logging events. | |
| * | |
| * <p>If the value {@link LoggerFilter::ACCEPT} is returned, then the log | |
| * event is logged without consulting the remaining filters. | |
| * | |
| * <p>The philosophy of log4php filters is largely inspired from the | |
| * Linux ipchains. | |
| * | |
| * @version $Revision: 1213283 $ | |
| * @package log4php | |
| */ | |
| abstract class LoggerFilter extends LoggerConfigurable { | |
| /** | |
| * The log event must be logged immediately without consulting with | |
| * the remaining filters, if any, in the chain. | |
| */ | |
| const ACCEPT = 1; | |
| /** | |
| * This filter is neutral with respect to the log event. The | |
| * remaining filters, if any, should be consulted for a final decision. | |
| */ | |
| const NEUTRAL = 0; | |
| /** | |
| * The log event must be dropped immediately without consulting | |
| * with the remaining filters, if any, in the chain. | |
| */ | |
| const DENY = -1; | |
| /** | |
| * @var LoggerFilter Points to the next {@link LoggerFilter} in the filter chain. | |
| */ | |
| protected $next; | |
| /** | |
| * Usually filters options become active when set. We provide a | |
| * default do-nothing implementation for convenience. | |
| */ | |
| public function activateOptions() { | |
| } | |
| /** | |
| * Decide what to do. | |
| * <p>If the decision is {@link LoggerFilter::DENY}, then the event will be | |
| * dropped. If the decision is {@link LoggerFilter::NEUTRAL}, then the next | |
| * filter, if any, will be invoked. If the decision is {@link LoggerFilter::ACCEPT} then | |
| * the event will be logged without consulting with other filters in | |
| * the chain. | |
| * | |
| * @param LoggerLoggingEvent $event The {@link LoggerLoggingEvent} to decide upon. | |
| * @return integer {@link LoggerFilter::NEUTRAL} or {@link LoggerFilter::DENY}|{@link LoggerFilter::ACCEPT} | |
| */ | |
| public function decide(LoggerLoggingEvent $event) { | |
| return self::NEUTRAL; | |
| } | |
| /** | |
| * Adds a new filter to the filter chain this filter is a part of. | |
| * If this filter has already and follow up filter, the param filter | |
| * is passed on until it is the last filter in chain. | |
| * | |
| * @param $filter - the filter to add to this chain | |
| */ | |
| public function addNext($filter) { | |
| if($this->next !== null) { | |
| $this->next->addNext($filter); | |
| } else { | |
| $this->next = $filter; | |
| } | |
| } | |
| /** | |
| * Returns the next filter in this chain | |
| * @return the next filter | |
| */ | |
| public function getNext() { | |
| return $this->next; | |
| } | |
| } |