private static String buildAbsoluteIdFromParts(String namespace, String name, String member) {
        if (member != null) {
            return namespace + '#' + name + '$' + member;
        } else {
            return namespace + '#' + name;
        }
    }
Creates an absolute shape ID from parts of a shape ID.

@param namespace Namespace of the shape.
@param name Name of the shape.
@param member Optional/nullable member name.
@return The parsed ID.
@throws ShapeIdSyntaxException when the ID is malformed.
smithy-model/src/main/java/software/amazon/smithy/model/shapes/ShapeId.java