public static List parseSubstring()

in subsystem/subsystem-core/src/main/java/org/apache/aries/subsystem/core/capabilityset/SimpleFilter.java [375:455]
65 lines of code
16 McCabe index (conditional complexity)

    public static List<String> parseSubstring(String value)
    {
        List<String> pieces = new ArrayList();
        StringBuffer ss = new StringBuffer();
        // int kind = SIMPLE; // assume until proven otherwise
        boolean wasStar = false; // indicates last piece was a star
        boolean leftstar = false; // track if the initial piece is a star
        boolean rightstar = false; // track if the final piece is a star

        int idx = 0;

        // We assume (sub)strings can contain leading and trailing blanks
        boolean escaped = false;
loop:   for (;;)
        {
            if (idx >= value.length())
            {
                if (wasStar)
                {
                    // insert last piece as "" to handle trailing star
                    rightstar = true;
                }
                else
                {
                    pieces.add(ss.toString());
                    // accumulate the last piece
                    // note that in the case of
                    // (cn=); this might be
                    // the string "" (!=null)
                }
                ss.setLength(0);
                break loop;
            }

            // Read the next character and account for escapes.
            char c = value.charAt(idx++);
            if (!escaped && (c == '*'))
            {
                // If we have successive '*' characters, then we can
                // effectively collapse them by ignoring succeeding ones.
                if (!wasStar)
                {
                    if (ss.length() > 0)
                    {
                        pieces.add(ss.toString()); // accumulate the pieces
                        // between '*' occurrences
                    }
                    ss.setLength(0);
                    // if this is a leading star, then track it
                    if (pieces.isEmpty())
                    {
                        leftstar = true;
                    }
                    wasStar = true;
                }
            }
            else if (!escaped && (c == '\\'))
            {
                escaped = true;
            }
            else
            {
                escaped = false;
                wasStar = false;
                ss.append(c);
            }
        }
        if (leftstar || rightstar || pieces.size() > 1)
        {
            // insert leading and/or trailing "" to anchor ends
            if (rightstar)
            {
                pieces.add("");
            }
            if (leftstar)
            {
                pieces.add(0, "");
            }
        }
        return pieces;
    }