public T handleSelectOne()

in azure-spring-cloud-maven-plugin/src/main/java/com/microsoft/azure/maven/springcloud/config/ConfigurationPrompter.java [91:128]
35 lines of code
10 McCabe index (conditional complexity)

    public <T> T handleSelectOne(String templateId, List<T> options, T defaultEntity, Function<T, String> getNameFunc)
            throws IOException, InvalidConfigurationException {
        final Map<String, Object> variables = createVariableTables(templateId);
        final boolean isRequired = TemplateUtils.evalBoolean("required", variables);
        if (options.size() == 0) {
            if (isRequired) {
                throw new InvalidConfigurationException(TemplateUtils.evalText("message.empty_options", variables));
            }
            final String warningMessage = TemplateUtils.evalText("message.empty_options", variables);
            if (StringUtils.isNotBlank(warningMessage)) {
                log.warn(warningMessage);
            }
            return null;
        }
        final boolean autoSelect = TemplateUtils.evalBoolean("auto_select", variables);
        if (options.size() == 1) {
            if (autoSelect) {
                log.info(TemplateUtils.evalText("message.auto_select", variables));
                return options.get(0);
            }
            if (!this.prompt.promoteYesNo(TemplateUtils.evalText("promote.one", variables),
                    /*
                     * if only one options is available, when it is required, select it by default
                     */
                    isRequired, isRequired)) {
                if (isRequired) {
                    throw new InvalidConfigurationException(TemplateUtils.evalText("message.select_none", variables));
                }
                return null;
            }
            return options.get(0);
        }
        if (defaultEntity == null && variables.containsKey("default_index")) {
            defaultEntity = options.get((Integer) variables.get("default_index"));
        }
        return prompt.promoteSingleEntity(TemplateUtils.evalText("promote.header", variables), TemplateUtils.evalText("promote.many", variables),
                options, defaultEntity, getNameFunc, isRequired);
    }