library/log4php/renderers/LoggerRendererMap.php
author Markus Bröker <broeker.markus@googlemail.com>
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Anpassungen nach den DB-Tests
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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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 * Manages defined renderers and determines which renderer to use for a given
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 * input.
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 *
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 * @version $Revision: 1394956 $
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 * @package log4php
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 * @subpackage renderers
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 * @since 0.3
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 */
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class LoggerRendererMap {
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    /**
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     * Maps class names to appropriate renderers.
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     * @var array
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     */
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    private $map = array();
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    /**
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     * The default renderer to use if no specific renderer is found.
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     * @var LoggerRenderer
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     */
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    private $defaultRenderer;
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    public function __construct() {
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        // Set default config
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        $this->reset();
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    }
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    /**
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     * Adds a renderer to the map.
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     *
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     * If a renderer already exists for the given <var>$renderedClass</var> it
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     * will be overwritten without warning.
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     *
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     * @param string $renderedClass The name of the class which will be
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     *        rendered by the renderer.
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     * @param string $renderingClass The name of the class which will
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     *        perform the rendering.
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     */
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    public function addRenderer($renderedClass, $renderingClass) {
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        // Check the rendering class exists
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        if (!class_exists($renderingClass)) {
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            trigger_error("log4php: Failed adding renderer. Rendering class [$renderingClass] not found.");
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            return;
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        }
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        // Create the instance
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        $renderer = new $renderingClass();
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        // Check the class implements the right interface
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        if (!($renderer instanceof LoggerRenderer)) {
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            trigger_error("log4php: Failed adding renderer. Rendering class [$renderingClass] does not implement the LoggerRenderer interface.");
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            return;
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        }
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        // Convert to lowercase since class names in PHP are not case sensitive
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        $renderedClass = strtolower($renderedClass);
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        $this->map[$renderedClass] = $renderer;
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    }
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    /**
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     * Sets a custom default renderer class.
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     *
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     * TODO: there's code duplication here. This method is almost identical to
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     * addRenderer(). However, it has custom error messages so let it sit for
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     * now.
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     *
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     * @param string $renderingClass The name of the class which will
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     *        perform the rendering.
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     */
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    public function setDefaultRenderer($renderingClass) {
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        // Check the class exists
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        if (!class_exists($renderingClass)) {
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            trigger_error("log4php: Failed setting default renderer. Rendering class [$renderingClass] not found.");
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            return;
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        }
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        // Create the instance
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        $renderer = new $renderingClass();
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        // Check the class implements the right interface
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        if (!($renderer instanceof LoggerRenderer)) {
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            trigger_error("log4php: Failed setting default renderer. Rendering class [$renderingClass] does not implement the LoggerRenderer interface.");
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            return;
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        }
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        $this->defaultRenderer = $renderer;
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    }
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    /**
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     * Returns the default renderer.
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     * @var LoggerRenderer
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     */
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    public function getDefaultRenderer() {
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        return $this->defaultRenderer;
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    }
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    /**
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     * Finds the appropriate renderer for the given <var>input</var>, and
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     * renders it (i.e. converts it to a string).
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     *
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     * @param mixed $input Input to render.
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     * @return string The rendered contents.
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     */
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    public function findAndRender($input) {
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        if ($input === null) {
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            return null;
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        }
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        // For objects, try to find a renderer in the map
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        if (is_object($input)) {
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            $renderer = $this->getByClassName(get_class($input));
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            if (isset($renderer)) {
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                return $renderer->render($input);
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            }
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        }
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        // Fall back to the default renderer
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        return $this->defaultRenderer->render($input);
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    }
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    /**
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     * Returns the appropriate renderer for a given object.
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     *
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     * @param mixed $object
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     * @return LoggerRenderer Or null if none found.
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     */
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    public function getByObject($object) {
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        if (!is_object($object)) {
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            return null;
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        }
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        return $this->getByClassName(get_class($object));
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    }
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    /**
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     * Returns the appropriate renderer for a given class name.
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     *
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     * If no renderer could be found, returns NULL.
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     *
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     * @param string $class
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     * @return LoggerRendererObject Or null if not found.
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     */
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    public function getByClassName($class) {
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        for (; !empty($class); $class = get_parent_class($class)) {
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            $class = strtolower($class);
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            if (isset($this->map[$class])) {
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                return $this->map[$class];
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            }
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        }
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        return null;
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    }
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    /** Empties the renderer map. */
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    public function clear() {
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        $this->map = array();
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    }
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    /** Resets the renderer map to it's default configuration. */
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    public function reset() {
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        $this->defaultRenderer = new LoggerRendererDefault();
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        $this->clear();
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        $this->addRenderer('Exception', 'LoggerRendererException');
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    }
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}