public void addHeader()

in geronimo-mail_2.1_spec/src/main/java/jakarta/mail/internet/InternetHeaders.java [406:468]
42 lines of code
9 McCabe index (conditional complexity)

    public void addHeader(final String name, final String value) {
        final InternetHeader newHeader = new InternetHeader(name, value);

        // The javamail spec states that "Recieved" headers need to be added in reverse order.
        // Return-Path is permitted before Received, so handle it the same way.
        if (name.equalsIgnoreCase("Received") || name.equalsIgnoreCase("Return-Path")) {
            // see if we have one of these already
            final int pos = findHeader(name);

            // either insert before an existing header, or insert at the very beginning
            if (pos != -1) {
                // this could be a placeholder header with a null value.  If it is, just update
                // the value.  Otherwise, insert in front of the existing header.
                final InternetHeader oldHeader = headers.get(pos);
                if (oldHeader.getValue() == null) {
                    oldHeader.setValue(value);
                }
                else {
                    headers.add(pos, newHeader);
                }
            }
            else {
                // doesn't exist, so insert at the beginning
                headers.add(0, newHeader);
            }
        }
        // normal insertion
        else {
            // see if we have one of these already
            int pos = findHeader(name);

            // either insert before an existing header, or insert at the very beginning
            if (pos != -1) {
                final InternetHeader oldHeader = headers.get(pos);
                // if the existing header is a place holder, we can just update the value
                if (oldHeader.getValue() == null) {
                    oldHeader.setValue(value);
                }
                else {
                    // we have at least one existing header with this name.  We need to find the last occurrance,
                    // and insert after that spot.

                    int lastPos = findHeader(name, pos + 1);

                    while (lastPos != -1) {
                        pos = lastPos;
                        lastPos = findHeader(name, pos + 1);
                    }

                    // ok, we have the insertion position
                    headers.add(pos + 1, newHeader);
                }
            }
            else {
                // find the insertion marker.  If that is missing somehow, insert at the end.
                pos = findHeader(":");
                if (pos == -1) {
                    pos = headers.size();
                }
                headers.add(pos, newHeader);
            }
        }
    }