@classmethod
def handle(cls, value, context, **kwargs):
    """Returns the value of a key for a given hook in hook_data.

        Format of value:

            <hook_name>::<key>
        """
    try:
        hook_name, key = value.split('::')
    except ValueError:
        raise ValueError(
            'Invalid value for hook_data: %s. Must be in <hook_name>::<key> format.'
             % value)
    return context.hook_data[hook_name][key]
