Wordpress helper class for paged querying

gistfile1.php

<?php

/**
 *
 */
class PagedResourceQuery
{

    public static $cachedQueries = array();

    public static $supportedQueries = array(
        "events" => array(
            'post_type' => 'events',
            'post_status' => 'publish',
            'suppress_filters' => false,
            'order' => 'ASC'
        ),
        "news" => array(
            'meta_key' => 'post_display_flag',
            'post_type' => 'news',
            'post_status' => 'publish',
            'posts_per_page' => -1,
            'orderby' => 'meta_value_num',
            'suppress_filters' => false,
            'order' => 'ASC'
        )
    );

    public static function query($resource, $start = 0, $end = 5)
    {
        $args = self::$supportedQueries[$resource];
        $args['posts_per_page'] = $end - $start;
        $args['paged'] = $start;

        return new WP_Query($args);
    }

    public static function get($resource, $start = 0, $end = 5)
    {
        // cache here
        $res = self::query($resource, $start, $end);
        return $res->get_posts();
    }

    public static function json($resource, $start = 0, $end = 5, $preprocessor =null)
    {
        // cache here
        $result = self::query($resource, $start, $end);
        if (isset($preprocessor) && is_callable($preprocessor)) {
            $result = call_user_func($preprocessor, $result->posts);
        } else {
            $result = $result->posts;
        }
        return json_encode($result);
    }
}

function eventsToJSON ($array) {
    $res = array();
    $temp = array();
    for ($i = 0; $i < count($array); $i++) {
        $v = $array[$i];
        $meta = get_post_meta($v->ID);
        $temp['post_title'] = $v->post_title;
        $temp['meta'] = $meta;
        $res[] = $temp;
    }
    return $res;
}

//print_r(PagedResourceQuery::json('news',0,5, 'eventsToJSON'));