public static String filterName()

in src/main/java/org/apache/sling/event/impl/support/ResourceHelper.java [137:168]

• 25 lines of code
• 8 McCabe index (conditional complexity)

    public static String filterName(final String resourceName) {
        if ( resourceName == null ) {
            return null;
        }
        final StringBuilder sb = new StringBuilder(resourceName.length());
        char lastAdded = 0;

        for(int i=0; i < resourceName.length(); i++) {
            final char c = resourceName.charAt(i);
            char toAdd = c;

            if (!ALLOWED_CHARS.get(c)) {
                if (lastAdded == REPLACEMENT_CHAR) {
                    // do not add several _ in a row
                    continue;
                }
                toAdd = REPLACEMENT_CHAR;

            } else if(i == 0 && Character.isDigit(c)) {
                sb.append(REPLACEMENT_CHAR);
            }

            sb.append(toAdd);
            lastAdded = toAdd;
        }

        if (sb.length()==0) {
            sb.append(REPLACEMENT_CHAR);
        }

        return sb.toString();
    }