library/log4php/pattern/LoggerPatternConverter.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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 * LoggerPatternConverter is an abstract class that provides the formatting
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 * functionality that derived classes need.
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 *
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 * <p>Conversion specifiers in a conversion patterns are parsed to
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 * individual PatternConverters. Each of which is responsible for
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 * converting a logging event in a converter specific manner.</p>
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 *
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 * @version $Revision: 1326626 $
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 * @package log4php
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 * @subpackage helpers
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 * @since 0.3
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 */
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abstract class LoggerPatternConverter {
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    /**
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     * Next converter in the converter chain.
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     * @var LoggerPatternConverter
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     */
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    public $next = null;
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    /**
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     * Formatting information, parsed from pattern modifiers.
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     * @var LoggerFormattingInfo
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     */
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    protected $formattingInfo;
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    /**
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     * Converter-specific formatting options.
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     * @var array
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     */
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    protected $option;
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    /**
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     * Constructor
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     * @param LoggerFormattingInfo $formattingInfo
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     * @param array $option
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     */
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    public function __construct(LoggerFormattingInfo $formattingInfo = null, $option = null) {
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        $this->formattingInfo = $formattingInfo;
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        $this->option = $option;
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        $this->activateOptions();
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    }
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    /**
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     * Called in constructor. Converters which need to process the options
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     * can override this method.
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     */
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    public function activateOptions() {
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    }
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    /**
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     * Converts the logging event to the desired format. Derived pattern
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     * converters must implement this method.
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     *
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     * @param LoggerLoggingEvent $event
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     */
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    abstract public function convert(LoggerLoggingEvent $event);
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    /**
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     * Converts the event and formats it according to setting in the
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     * Formatting information object.
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     *
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     * @param string &$sbuf string buffer to write to
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     * @param LoggerLoggingEvent $event Event to be formatted.
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     */
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    public function format(&$sbuf, $event) {
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        $string = $this->convert($event);
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        if (!isset($this->formattingInfo)) {
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            $sbuf .= $string;
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            return;
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        }
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        $fi = $this->formattingInfo;
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        // Empty string
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        if ($string === '' || is_null($string)) {
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            if ($fi->min > 0) {
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                $sbuf .= str_repeat(' ', $fi->min);
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            }
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            return;
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        }
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        $len = strlen($string);
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        // Trim the string if needed
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        if ($len > $fi->max) {
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            if ($fi->trimLeft) {
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                $sbuf .= substr($string, $len - $fi->max, $fi->max);
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            } else {
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                $sbuf .= substr($string, 0, $fi->max);
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            }
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        } // Add padding if needed
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        else if ($len < $fi->min) {
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            if ($fi->padLeft) {
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                $sbuf .= str_repeat(' ', $fi->min - $len);
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                $sbuf .= $string;
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            } else {
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                $sbuf .= $string;
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                $sbuf .= str_repeat(' ', $fi->min - $len);
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            }
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        } // No action needed
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        else {
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            $sbuf .= $string;
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        }
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    }
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}