protected String getValueToUse()

in src/main/java/org/apache/sling/jackrabbit/usermanager/impl/post/PrincipalNameGeneratorImpl.java [136:187]
41 lines of code
16 McCabe index (conditional complexity)

    protected String getValueToUse(Map<String, ?> parameters, String paramName) {
        String valueToUse = null;
        List<String> values = valueToList(parameters.get(paramName));
        if (!values.isEmpty()) {
            for (String specialParam : values) {
                if (specialParam != null && !specialParam.isEmpty()) {
                    valueToUse = specialParam;
                }

                if (valueToUse != null) {
                    if (valueToUse.isEmpty()) {
                        // empty value is not usable
                        valueToUse = null;
                    } else {
                        // found value, so stop looping
                        break;
                    }
                }
            }
        } else {
            // check for a paramName@ValueFrom param
            // SLING-130: VALUE_FROM_SUFFIX means take the value of this
            // property from a different field
            values = valueToList(parameters.get(String.format("%s%s", paramName, SlingPostConstants.VALUE_FROM_SUFFIX)));
            if (!values.isEmpty()) {
                for (String specialParam : values) {
                    if (specialParam != null && !specialParam.isEmpty()) {
                        // retrieve the reference parameter value
                        List<String> refValues = valueToList(parameters.get(specialParam));
                        // @ValueFrom params must have exactly one value, else ignored
                        if (refValues.size() == 1) {
                            specialParam = refValues.get(0);
                            if (specialParam != null && !specialParam.isEmpty()) {
                                valueToUse = specialParam;
                            }
                        }
                    }

                    if (valueToUse != null) {
                        if (valueToUse.isEmpty()) {
                            // empty value is not usable
                            valueToUse = null;
                        } else {
                            // found value, so stop looping
                            break;
                        }
                    }
                }
            }
        }
        return valueToUse;
    }