/**
* Checks that a component tag as an attribute and that the attribute has the required value
* Throws an IllegalStateException if it is not
* @param ComponentTag $tag The tag to check
* @param String $attribute The attribute to find
* @param String $value The value the attribute will have
*/
protected function checkComponentTagAttribute(ComponentTag $tag, $attribute, $value)
{
$attributes = $tag->getAttributes();
if (!array_key_exists($attribute, $attributes) || $attributes[$attribute] != $value) {
throw new \IllegalStateException(sprintf("An %s component can only be added to a tag with a %s of %s", get_called_class(), $attribute, $value));
}
}
