private int readNormalizedVertexAttributeIndex()

in commons-geometry-io-euclidean/src/main/java/org/apache/commons/geometry/io/euclidean/threed/obj/PolygonObjParser.java [244:273]

• 24 lines of code
• 4 McCabe index (conditional complexity)

    private int readNormalizedVertexAttributeIndex(final String type, final int available) {
        final SimpleTextParser parser = getTextParser();

        final int objIndex = parser
                .nextWithLineContinuation(ObjConstants.LINE_CONTINUATION_CHAR, SimpleTextParser::isIntegerPart)
                .getCurrentTokenAsInt();

        final int normalizedIndex = objIndex < 0 ?
                available + objIndex :
                objIndex - 1;

        if (normalizedIndex < 0 || normalizedIndex >= available) {
            final StringBuilder err = new StringBuilder();
            err.append(type)
                .append(" index ");

            if (available < 1) {
                err.append("cannot be used because no values of that type have been defined");
            } else {
                err.append("must evaluate to be within the range [1, ")
                    .append(available)
                    .append("] but was ")
                    .append(objIndex);
            }

            throw parser.tokenError(err.toString());
        }

        return normalizedIndex;
    }