static String decodeUrl()

in src/main/java/org/apache/commons/io/FileUtils.java [1192:1223]

• 30 lines of code
• 9 McCabe index (conditional complexity)

    static String decodeUrl(final String url) {
        String decoded = url;
        if (url != null && url.indexOf('%') >= 0) {
            final int n = url.length();
            final StringBuilder builder = new StringBuilder();
            final ByteBuffer byteBuffer = ByteBuffer.allocate(n);
            for (int i = 0; i < n; ) {
                if (url.charAt(i) == '%') {
                    try {
                        do {
                            final byte octet = (byte) Integer.parseInt(url.substring(i + 1, i + 3), 16);
                            byteBuffer.put(octet);
                            i += 3;
                        } while (i < n && url.charAt(i) == '%');
                        continue;
                    } catch (final IndexOutOfBoundsException | NumberFormatException ignored) {
                        // malformed percent-encoded octet, fall through and
                        // append characters literally
                    } finally {
                        if (byteBuffer.position() > 0) {
                            byteBuffer.flip();
                            builder.append(StandardCharsets.UTF_8.decode(byteBuffer).toString());
                            byteBuffer.clear();
                        }
                    }
                }
                builder.append(url.charAt(i++));
            }
            decoded = builder.toString();
        }
        return decoded;
    }