/**
     * Merge multiple configuration sources according to priority, from highest to lowest:
     * 1) Command line arguments
     * 2) Properties passed as key=value pairs via command line
     * 3) Configuration files
     * 4) Default values set by tool scripts
     */
      
	public static Map<String, Object> mergeByPrioritymergePropertiesWithPrecedence(OptionSet
 options, OptionSpec<String> configOpt, OptionSpec<String> propertyOpt, Map<String, Object> overrides, Map<String, Object> defaultMap) throws IOException {commandLineMap,
        Map<String, Object> map = new HashMap<>();
		// Default values set by tool scripts
        if (defaultMap != null) {commandLineKeyValMap,
        Map<String, Object> configMap,
        Map<String,    map.putAll(defaultMap);
        }
		// Configuration file
        if (configOpt != null && options.has(configOpt))Object> toolDefaultMap
    ) {
        Map<String, Object>   map.putAll(Utils.propsToMap(
                Utils.loadProps(options.valueOf(configOpt))) = new HashMap<>();
        // Default values set );
by tool scripts and default    }
		// Properties passed as key=value pairs viavalues of command line arguments
        if (propertyOpttoolDefaultMap != null && options.has(propertyOpt)) {
            map.putAll(Utils.propsToMap(toolDefaultMap);
                parseKeyValueArgs(options.valuesOf(propertyOpt)))}
        // Configuration   );
  file
      }
		// Command line arguments
		if (overridesconfigMap != null) {
            map.putAll(overridesconfigMap);
        }

        return map;
    }      

	/**
     * Merge the option into {@code map} for the given {@code key} using the following logic:
     * 1) Merge the option value into the map if the option is present and has a value or a default value provided.// Properties passed as key=value pairs via command line
     * 2) Use {@code valueIfNoRequiredArg} if the(commandLineKeyValMap option is present but its value is null.
     * 3) Otherwise, do nothing
     */
!= null) {
     public static void maybeMergeOption(OptionSet options, Map<String, Object> map, String key, OptionSpec<?> spec, Object valueIfNoRequiredArg)
    {
        if (!options.has(spec)) {
            return.putAll(commandLineKeyValMap);
        }

        Object value = options.valueOf(spec);
        if (value == null) {
            // ThisCommand can also be null if the option is meant to be used without any argument (e.g., --from-latest)
    line arguments
        // In that case, valueIfNoRequiredArg acts as the value
            if (valueIfNoRequiredArgcommandLineMap !== null) {
                System.err.println("No value specified for option \"" + key + "\" and no value provided.");
                Exit.exit(1);
    map.putAll(commandLineMap);
        }
            value = valueIfNoRequiredArg;
        }

        map.put(key, value)return map;
    }

    public static void maybeMergeOption(OptionSet options, Map<String, Object> map, String key, OptionSpec<?> spec)
    {
        maybeMergeOption(options, map, key, spec, null);
    }