library/log4php/LoggerFilter.php
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<?php
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/**
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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 * contributor license agreements. See the NOTICE file distributed with
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 * this work for additional information regarding copyright ownership.
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 * The ASF licenses this file to You under the Apache License, Version 2.0
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 * (the "License"); you may not use this file except in compliance with
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 * the License. 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 log4php
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 */
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/**
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 * Users should extend this class to implement customized logging
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 * event filtering. Note that {@link LoggerCategory} and {@link LoggerAppender},
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 * the parent class of all standard
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 * appenders, have built-in filtering rules. It is suggested that you
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 * first use and understand the built-in rules before rushing to write
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 * your own custom filters.
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 *
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 * <p>This abstract class assumes and also imposes that filters be
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 * organized in a linear chain. The {@link #decide
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 * decide(LoggerLoggingEvent)} method of each filter is called sequentially,
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 * in the order of their addition to the chain.
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 *
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 * <p>The {@link decide()} method must return one
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 * of the integer constants {@link LoggerFilter::DENY},
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 * {@link LoggerFilter::NEUTRAL} or {@link LoggerFilter::ACCEPT}.
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 *
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 * <p>If the value {@link LoggerFilter::DENY} is returned, then the log event is
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 * dropped immediately without consulting with the remaining
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 * filters.
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 *
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 * <p>If the value {@link LoggerFilter::NEUTRAL} is returned, then the next filter
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 * in the chain is consulted. If there are no more filters in the
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 * chain, then the log event is logged. Thus, in the presence of no
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 * filters, the default behaviour is to log all logging events.
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 *
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 * <p>If the value {@link LoggerFilter::ACCEPT} is returned, then the log
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 * event is logged without consulting the remaining filters.
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 *
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 * <p>The philosophy of log4php filters is largely inspired from the
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 * Linux ipchains.
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 *
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 * @version $Revision: 1213283 $
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 * @package log4php
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 */
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abstract class LoggerFilter extends LoggerConfigurable {
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    /**
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     * The log event must be logged immediately without consulting with
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     * the remaining filters, if any, in the chain.
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     */
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    const ACCEPT = 1;
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    /**
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     * This filter is neutral with respect to the log event. The
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     * remaining filters, if any, should be consulted for a final decision.
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     */
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    const NEUTRAL = 0;
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    /**
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     * The log event must be dropped immediately without consulting
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     * with the remaining filters, if any, in the chain.
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     */
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    const DENY = -1;
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    /**
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     * @var LoggerFilter Points to the next {@link LoggerFilter} in the filter chain.
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     */
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    protected $next;
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    /**
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     * Usually filters options become active when set. We provide a
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     * default do-nothing implementation for convenience.
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     */
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    public function activateOptions() {
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    }
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    /**
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     * Decide what to do.
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     * <p>If the decision is {@link LoggerFilter::DENY}, then the event will be
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     * dropped. If the decision is {@link LoggerFilter::NEUTRAL}, then the next
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     * filter, if any, will be invoked. If the decision is {@link LoggerFilter::ACCEPT} then
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     * the event will be logged without consulting with other filters in
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     * the chain.
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     *
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     * @param LoggerLoggingEvent $event The {@link LoggerLoggingEvent} to decide upon.
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     * @return integer {@link LoggerFilter::NEUTRAL} or {@link LoggerFilter::DENY}|{@link LoggerFilter::ACCEPT}
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     */
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    public function decide(LoggerLoggingEvent $event) {
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        return self::NEUTRAL;
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    }
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    /**
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     * Adds a new filter to the filter chain this filter is a part of.
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     * If this filter has already and follow up filter, the param filter
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     * is passed on until it is the last filter in chain.
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     *
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     * @param $filter - the filter to add to this chain
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     */
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    public function addNext($filter) {
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        if ($this->next !== null) {
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            $this->next->addNext($filter);
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        } else {
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            $this->next = $filter;
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        }
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    }
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    /**
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     * Returns the next filter in this chain
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     * @return the next filter
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     */
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    public function getNext() {
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        return $this->next;
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    }
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}