question: public static boolean computeBooleanFromString ( String stringBoolean , boolean defaultValue ) { if ( stringBoolean == null ) return defaultValue ; else if ( stringBoolean . equalsIgnoreCase ( "true" ) ) return true ; else if ( stringBoolean . equalsIgnoreCase ( "false" ) ) return false ; else throw new IllegalArgumentException ( "Property value must be \"true\" or \"false\" instead of \"" + stringBoolean + "\"" ) ; }
target:  Computes a boolean value from a string value retrieved from a property in the given map.