<?php

/**
 * Concrete class for void caching strategy.
 *
 * @instantiator new
 * @author       Time.ly Network, Inc.
 * @since        2.0
 * @package      Ai1EC
 * @subpackage   Ai1EC.Cache.Strategy
 */
class Ai1ec_Cache_Strategy_Void extends Ai1ec_Cache_Strategy {

    /**
     * Checks if engine is available
     *
     * @return bool Always true
     */
    static public function is_available() {
        return true;
    }

    /**
     *
     * @see Ai1ec_Get_Data_From_Cache::get_data()
     *
     */
    public function get_data( $dist_key ) {
        throw new Ai1ec_Cache_Not_Set_Exception( "'$dist_key' not set" );
    }

    /**
     *
     * @see Ai1ec_Write_Data_To_Cache::write_data()
     *
     */
    public function write_data( $dist_key, $value ) {
        throw new Ai1ec_Cache_Not_Set_Exception(
            'Failed to write \'' . $dist_key . '\' to void cache'
        );
    }

    /**
     * (non-PHPdoc)
     * @see Ai1ec_Write_Data_To_Cache::delete_data()
     */
    public function delete_data( $key ) {
        return false;
    }

    /**
     *
     * @see Ai1ec_Write_Data_To_Cache::delete_matching()
     */
    public function delete_matching( $pattern ) {
        return 0;
    }

}