晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : /home/akaindir/public_html/crm/libraries/htmlpurifier/library/HTMLPurifier/DefinitionCache.php
<?php

/**
 * Abstract class representing Definition cache managers that implements
 * useful common methods and is a factory.
 * @todo Create a separate maintenance file advanced users can use to
 *       cache their custom HTMLDefinition, which can be loaded
 *       via a configuration directive
 * @todo Implement memcached
 */
abstract class HTMLPurifier_DefinitionCache
{

    public $type;

    /**
     * @param $name Type of definition objects this instance of the
     *      cache will handle.
     */
    public function __construct($type) {
        $this->type = $type;
    }

    /**
     * Generates a unique identifier for a particular configuration
     * @param Instance of HTMLPurifier_Config
     */
    public function generateKey($config) {
        return $config->version . ',' . // possibly replace with function calls
               $config->getBatchSerial($this->type) . ',' .
               $config->get($this->type, 'DefinitionRev');
    }

    /**
     * Tests whether or not a key is old with respect to the configuration's
     * version and revision number.
     * @param $key Key to test
     * @param $config Instance of HTMLPurifier_Config to test against
     */
    public function isOld($key, $config) {
        if (substr_count($key, ',') < 2) return true;
        list($version, $hash, $revision) = explode(',', $key, 3);
        $compare = version_compare($version, $config->version);
        // version mismatch, is always old
        if ($compare != 0) return true;
        // versions match, ids match, check revision number
        if (
            $hash == $config->getBatchSerial($this->type) &&
            $revision < $config->get($this->type, 'DefinitionRev')
        ) return true;
        return false;
    }

    /**
     * Checks if a definition's type jives with the cache's type
     * @note Throws an error on failure
     * @param $def Definition object to check
     * @return Boolean true if good, false if not
     */
    public function checkDefType($def) {
        if ($def->type !== $this->type) {
            trigger_error("Cannot use definition of type {$def->type} in cache for {$this->type}");
            return false;
        }
        return true;
    }

    /**
     * Adds a definition object to the cache
     */
    abstract public function add($def, $config);

    /**
     * Unconditionally saves a definition object to the cache
     */
    abstract public function set($def, $config);

    /**
     * Replace an object in the cache
     */
    abstract public function replace($def, $config);

    /**
     * Retrieves a definition object from the cache
     */
    abstract public function get($config);

    /**
     * Removes a definition object to the cache
     */
    abstract public function remove($config);

    /**
     * Clears all objects from cache
     */
    abstract public function flush($config);

    /**
     * Clears all expired (older version or revision) objects from cache
     * @note Be carefuly implementing this method as flush. Flush must
     *       not interfere with other Definition types, and cleanup()
     *       should not be repeatedly called by userland code.
     */
    abstract public function cleanup($config);

}

// vim: et sw=4 sts=4

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