private String readLine()

in src/main/java/org/apache/commons/io/input/ReversedLinesFileReader.java [174:225]
33 lines of code
9 McCabe index (conditional complexity)

        private String readLine() { //NOPMD Bug in PMD

            String line = null;
            int newLineMatchByteCount;

            final boolean isLastFilePart = no == 1;

            int i = currentLastBytePos;
            while (i > -1) {

                if (!isLastFilePart && i < avoidNewlineSplitBufferSize) {
                    // avoidNewlineSplitBuffer: for all except the last file part we
                    // take a few bytes to the next file part to avoid splitting of newlines
                    createLeftOver();
                    break; // skip last few bytes and leave it to the next file part
                }

                // --- check for newline ---
                if ((newLineMatchByteCount = getNewLineMatchByteCount(data, i)) > 0 /* found newline */) {
                    final int lineStart = i + 1;
                    final int lineLengthBytes = currentLastBytePos - lineStart + 1;

                    if (lineLengthBytes < 0) {
                        throw new IllegalStateException("Unexpected negative line length=" + lineLengthBytes);
                    }
                    final byte[] lineData = Arrays.copyOfRange(data, lineStart, lineStart + lineLengthBytes);

                    line = new String(lineData, charset);

                    currentLastBytePos = i - newLineMatchByteCount;
                    break; // found line
                }

                // --- move cursor ---
                i -= byteDecrement;

                // --- end of file part handling ---
                if (i < 0) {
                    createLeftOver();
                    break; // end of file part
                }
            }

            // --- last file part handling ---
            if (isLastFilePart && leftOver != null) {
                // there will be no line break anymore, this is the first line of the file
                line = new String(leftOver, charset);
                leftOver = null;
            }

            return line;
        }