static Map fieldsDelta()

in scripts/src/main/java/com/gu/typesafe/config/impl/SimpleConfigOrigin.java [424:474]
46 lines of code
21 McCabe index (conditional complexity)

    static Map<SerializedField, Object> fieldsDelta(Map<SerializedField, Object> base,
            Map<SerializedField, Object> child) {
        Map<SerializedField, Object> m = new EnumMap<SerializedField, Object>(child);

        for (Map.Entry<SerializedField, Object> baseEntry : base.entrySet()) {
            SerializedField f = baseEntry.getKey();
            if (m.containsKey(f) && ConfigImplUtil.equalsHandlingNull(baseEntry.getValue(), m.get(f))) {
                // if field is unchanged, just remove it so we inherit
                m.remove(f);
            } else if (!m.containsKey(f)) {
                // if field has been removed, we have to add a deletion entry
                switch (f) {
                case ORIGIN_DESCRIPTION:
                    throw new com.gu.typesafe.config.ConfigException.BugOrBroken("origin missing description field? " + child);
                case ORIGIN_LINE_NUMBER:
                    m.put(SerializedField.ORIGIN_LINE_NUMBER, -1);
                    break;
                case ORIGIN_END_LINE_NUMBER:
                    m.put(SerializedField.ORIGIN_END_LINE_NUMBER, -1);
                    break;
                case ORIGIN_TYPE:
                    throw new com.gu.typesafe.config.ConfigException.BugOrBroken("should always be an ORIGIN_TYPE field");
                case ORIGIN_URL:
                    m.put(SerializedField.ORIGIN_NULL_URL, "");
                    break;
                case ORIGIN_RESOURCE:
                    m.put(SerializedField.ORIGIN_NULL_RESOURCE, "");
                    break;
                case ORIGIN_COMMENTS:
                    m.put(SerializedField.ORIGIN_NULL_COMMENTS, "");
                    break;
                case ORIGIN_NULL_URL: // FALL THRU
                case ORIGIN_NULL_RESOURCE: // FALL THRU
                case ORIGIN_NULL_COMMENTS:
                    throw new com.gu.typesafe.config.ConfigException.BugOrBroken("computing delta, base object should not contain " + f + " "
                            + base);
                case END_MARKER:
                case ROOT_VALUE:
                case ROOT_WAS_CONFIG:
                case UNKNOWN:
                case VALUE_DATA:
                case VALUE_ORIGIN:
                    throw new com.gu.typesafe.config.ConfigException.BugOrBroken("should not appear here: " + f);
                }
            } else {
                // field is in base and child, but differs, so leave it
            }
        }

        return m;
    }