private static ConfigResult getConfig()

in log4j-core/src/main/java/org/apache/logging/log4j/core/filter/MutableThreadContextMapFilter.java [319:389]
71 lines of code
16 McCabe index (conditional complexity)

    private static ConfigResult getConfig(final LastModifiedSource source,
            final AuthorizationProvider authorizationProvider) {
        final File inputFile = source.getFile();
        InputStream inputStream = null;
        HttpInputStreamUtil.Result result = null;
        final long lastModified = source.getLastModified();
        if (inputFile != null && inputFile.exists()) {
            try {
                final long modified = inputFile.lastModified();
                if (modified > lastModified) {
                    source.setLastModified(modified);
                    inputStream = new FileInputStream(inputFile);
                    result = new HttpInputStreamUtil.Result(Status.SUCCESS);
                } else {
                    result = new HttpInputStreamUtil.Result(Status.NOT_MODIFIED);
                }
            } catch (Exception ex) {
                result = new HttpInputStreamUtil.Result(Status.ERROR);
            }
        } else if (source.getURI() != null) {
            try {
                result = HttpInputStreamUtil.getInputStream(source, authorizationProvider);
                inputStream = result.getInputStream();
            } catch (ConfigurationException ex) {
                result = new HttpInputStreamUtil.Result(Status.ERROR);
            }
        } else {
            result = new HttpInputStreamUtil.Result(Status.NOT_FOUND);
        }
        final ConfigResult configResult = new ConfigResult();
        if (result.getStatus() == Status.SUCCESS) {
            LOGGER.debug("Processing Debug key/value pairs from: {}", source.toString());
            try {
                final KeyValuePairConfig keyValuePairConfig = MAPPER.readValue(inputStream, KeyValuePairConfig.class);
                if (keyValuePairConfig != null) {
                    final Map<String, String[]> configs = keyValuePairConfig.getConfigs();
                    if (configs != null && configs.size() > 0) {
                        final List<KeyValuePair> pairs = new ArrayList<>();
                        for (Map.Entry<String, String[]> entry : configs.entrySet()) {
                            final String key = entry.getKey();
                            for (final String value : entry.getValue()) {
                                if (value != null) {
                                    pairs.add(new KeyValuePair(key, value));
                                } else {
                                    LOGGER.warn("Ignoring null value for {}", key);
                                }
                            }
                        }
                        if (pairs.size() > 0) {
                            configResult.pairs = pairs.toArray(EMPTY_ARRAY);
                            configResult.status = Status.SUCCESS;
                        } else {
                            configResult.status = Status.EMPTY;
                        }
                    } else {
                        LOGGER.debug("No configuration data in {}", source.toString());
                        configResult.status = Status.EMPTY;
                    }
                } else {
                    LOGGER.warn("No configs element in MutableThreadContextMapFilter configuration");
                    configResult.status = Status.ERROR;
                }
            } catch (Exception ex) {
                LOGGER.warn("Invalid key/value pair configuration, input ignored: {}", ex.getMessage());
                configResult.status = Status.ERROR;
            }
        } else {
            configResult.status = result.getStatus();
        }
        return configResult;
    }