library/log4php/configurators/LoggerConfigurationAdapterXML.php
author Markus Broeker<broeker.markus@googlemail.com>
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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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 * Converts XML configuration files to a PHP array.
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 *
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 * @package log4php
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 * @subpackage configurators
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 * @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
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 * @version $Revision: 1394956 $
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 * @since 2.2
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 */
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class LoggerConfigurationAdapterXML implements LoggerConfigurationAdapter {
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    /** Path to the XML schema used for validation. */
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    const SCHEMA_PATH = '/../xml/log4php.xsd';
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    private $config = array(
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        'appenders' => array(),
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        'loggers' => array(),
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        'renderers' => array(),
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    );
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    public function convert($url) {
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        $xml = $this->loadXML($url);
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        $this->parseConfiguration($xml);
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        // Parse the <root> node
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        if (isset($xml->root)) {
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            $this->parseRootLogger($xml->root);
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        }
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        // Process <logger> nodes
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        foreach ($xml->logger as $logger) {
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            $this->parseLogger($logger);
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        }
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        // Process <appender> nodes
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        foreach ($xml->appender as $appender) {
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            $this->parseAppender($appender);
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        }
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        // Process <renderer> nodes
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        foreach ($xml->renderer as $rendererNode) {
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            $this->parseRenderer($rendererNode);
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        }
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        // Process <defaultRenderer> node
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        foreach ($xml->defaultRenderer as $rendererNode) {
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            $this->parseDefaultRenderer($rendererNode);
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        }
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        return $this->config;
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    }
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    /**
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     * Loads and validates the XML.
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     * @param string $url Input XML.
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     */
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    private function loadXML($url) {
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        if (!file_exists($url)) {
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            throw new LoggerException("File [$url] does not exist.");
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        }
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        libxml_clear_errors();
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        $oldValue = libxml_use_internal_errors(true);
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        // Load XML
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        $xml = @simplexml_load_file($url);
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        if ($xml === false) {
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            $errorStr = "";
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            foreach (libxml_get_errors() as $error) {
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                $errorStr .= $error->message;
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            }
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            throw new LoggerException("Error loading configuration file: " . trim($errorStr));
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        }
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        libxml_clear_errors();
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        libxml_use_internal_errors($oldValue);
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        return $xml;
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    }
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    /**
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     * Parses the <configuration> node.
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     */
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    private function parseConfiguration(SimpleXMLElement $xml) {
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        $attributes = $xml->attributes();
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        if (isset($attributes['threshold'])) {
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            $this->config['threshold'] = (string)$attributes['threshold'];
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        }
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    }
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    /** Parses an <appender> node. */
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    private function parseAppender(SimpleXMLElement $node) {
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        $name = $this->getAttributeValue($node, 'name');
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        if (empty($name)) {
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            $this->warn("An <appender> node is missing the required 'name' attribute. Skipping appender definition.");
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            return;
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        }
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        $appender = array();
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        $appender['class'] = $this->getAttributeValue($node, 'class');
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        if (isset($node['threshold'])) {
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            $appender['threshold'] = $this->getAttributeValue($node, 'threshold');
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        }
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        if (isset($node->layout)) {
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            $appender['layout'] = $this->parseLayout($node->layout, $name);
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        }
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        if (count($node->param) > 0) {
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            $appender['params'] = $this->parseParameters($node);
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        }
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        foreach ($node->filter as $filterNode) {
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            $appender['filters'][] = $this->parseFilter($filterNode);
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        }
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        $this->config['appenders'][$name] = $appender;
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    }
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    /** Parses a <layout> node. */
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    private function parseLayout(SimpleXMLElement $node, $appenderName) {
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        $layout = array();
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        $layout['class'] = $this->getAttributeValue($node, 'class');
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        if (count($node->param) > 0) {
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            $layout['params'] = $this->parseParameters($node);
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        }
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        return $layout;
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    }
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    /** Parses any <param> child nodes returning them in an array. */
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    private function parseParameters($paramsNode) {
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        $params = array();
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        foreach ($paramsNode->param as $paramNode) {
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            if (empty($paramNode['name'])) {
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                $this->warn("A <param> node is missing the required 'name' attribute. Skipping parameter.");
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                continue;
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            }
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            $name = $this->getAttributeValue($paramNode, 'name');
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            $value = $this->getAttributeValue($paramNode, 'value');
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            $params[$name] = $value;
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        }
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        return $params;
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    }
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    /** Parses a <root> node. */
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    private function parseRootLogger(SimpleXMLElement $node) {
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        $logger = array();
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        if (isset($node->level)) {
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            $logger['level'] = $this->getAttributeValue($node->level, 'value');
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        }
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        $logger['appenders'] = $this->parseAppenderReferences($node);
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        $this->config['rootLogger'] = $logger;
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    }
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    /** Parses a <logger> node. */
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    private function parseLogger(SimpleXMLElement $node) {
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        $logger = array();
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        $name = $this->getAttributeValue($node, 'name');
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        if (empty($name)) {
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            $this->warn("A <logger> node is missing the required 'name' attribute. Skipping logger definition.");
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            return;
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        }
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        if (isset($node->level)) {
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            $logger['level'] = $this->getAttributeValue($node->level, 'value');
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        }
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        if (isset($node['additivity'])) {
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            $logger['additivity'] = $this->getAttributeValue($node, 'additivity');
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        }
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        $logger['appenders'] = $this->parseAppenderReferences($node);
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        // Check for duplicate loggers
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        if (isset($this->config['loggers'][$name])) {
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            $this->warn("Duplicate logger definition [$name]. Overwriting.");
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        }
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        $this->config['loggers'][$name] = $logger;
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    }
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    /**
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     * Parses a <logger> node for appender references and returns them in an array.
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     *
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     * Previous versions supported appender-ref, as well as appender_ref so both
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     * are parsed for backward compatibility.
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     */
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    private function parseAppenderReferences(SimpleXMLElement $node) {
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        $refs = array();
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        foreach ($node->appender_ref as $ref) {
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            $refs[] = $this->getAttributeValue($ref, 'ref');
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        }
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        foreach ($node->{'appender-ref'} as $ref) {
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            $refs[] = $this->getAttributeValue($ref, 'ref');
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        }
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        return $refs;
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    }
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    /** Parses a <filter> node. */
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    private function parseFilter($filterNode) {
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        $filter = array();
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        $filter['class'] = $this->getAttributeValue($filterNode, 'class');
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        if (count($filterNode->param) > 0) {
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            $filter['params'] = $this->parseParameters($filterNode);
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        }
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        return $filter;
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    }
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    /** Parses a <renderer> node. */
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    private function parseRenderer(SimpleXMLElement $node) {
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        $renderedClass = $this->getAttributeValue($node, 'renderedClass');
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        $renderingClass = $this->getAttributeValue($node, 'renderingClass');
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        $this->config['renderers'][] = compact('renderedClass', 'renderingClass');
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    }
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    /** Parses a <defaultRenderer> node. */
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    private function parseDefaultRenderer(SimpleXMLElement $node) {
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        $renderingClass = $this->getAttributeValue($node, 'renderingClass');
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        // Warn on duplicates
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        if (isset($this->config['defaultRenderer'])) {
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            $this->warn("Duplicate <defaultRenderer> node. Overwriting.");
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        }
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        $this->config['defaultRenderer'] = $renderingClass;
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    }
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    // ******************************************
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    // ** Helper methods                       **
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    // ******************************************
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    private function getAttributeValue(SimpleXMLElement $node, $name) {
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        return isset($node[$name]) ? (string)$node[$name] : null;
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    }
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    private function warn($message) {
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        trigger_error("log4php: " . $message, E_USER_WARNING);
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    }
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}
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