Stream wrappers that only rewrite URLs, best method?

[Forizon]

I have written a stream wrapper that behaves just like the File System stream wrapper because it only translates URLs into something that File System can handle in calls such as (include 'custom://module/path/to/file.php', is_file, is_readable, fopen, etc). It works, but I can't help but think that there has to be a better way.

Here is a part of the code:

class MyStream {
    // ...
    public function stream_open ($path, $mode, $options, &$opened_path)
    {
        // translate the given url into an actual file path
        $this->real_path = self::translate($path);

    $this->resource = fopen($this->real_path, $mode);
    if ($this->resource !== false && ($options & STREAM_USE_PATH) === STREAM_USE_PATH) {
        $opened_path = $this->resource;
    } 
    return $this->resource !== false;
} 

public function stream_close ()
{
    fclose($this->resource);
} 

public function stream_read ($count)
{
    return fread($this->resource, $count);
} 

public function stream_write ($data)
{
    return fwrite($this->resource, $data);
} 
// etc for about [B]twenty[/B] methods.

Is there some sort of filter that I can use to accomplish this without all this overhead and to minimize the areas where I could screw up?