53 
  54     /**
  55      * If the value is not set, and no fallback value is found,
  56      * the parameter uses the value returned by the producer.
  57      */
  58     Function<Map<String, ? super Object>, T> defaultValueFunction;
  59 
  60     /**
  61      * An optional string converter for command line arguments.
  62      */
  63     BiFunction<String, Map<String, ? super Object>, T> stringConverter;
  64 
  65     String getID() {
  66         return id;
  67     }
  68 
  69     Class<T> getValueType() {
  70         return valueType;
  71     }
  72 
  73     void setValueType(Class<T> valueType) {
  74         this.valueType = valueType;
  75     }
  76 
  77     boolean getIsDefaultValue() {
  78         return isDefaultValue;
  79     }
  80 
  81     Function<Map<String, ? super Object>, T> getDefaultValueFunction() {
  82         return defaultValueFunction;
  83     }
  84 
  85     void setDefaultValueFunction(
  86             Function<Map<String, ? super Object>, T> defaultValueFunction) {
  87         this.defaultValueFunction = defaultValueFunction;
  88     }
  89 
  90     BiFunction<String, Map<String, ? super Object>,T>
  91             getStringConverter() {
  92         return stringConverter;
  93     }
  94 
  95     void setStringConverter(BiFunction<String,
  96             Map<String, ? super Object>, T> stringConverter) {
  97         this.stringConverter = stringConverter;
  98     }
  99 
 100     @SuppressWarnings("unchecked")
 101     final T fetchFrom(Map<String, ? super Object> params) {
 102         return fetchFrom(params, true);
 103     }
 104 
 105     @SuppressWarnings("unchecked")
 106     final T fetchFrom(Map<String, ? super Object> params,
 107             boolean invokeDefault) {
 108         Object o = params.get(getID());
 109         if (o instanceof String && getStringConverter() != null) {
 110             return getStringConverter().apply((String)o, params);
 111         }
 112 
 113         Class<T> klass = getValueType();
 114         if (klass.isInstance(o)) {
 115             return (T) o;
 116         }
 117         if (o != null) {

  53 
  54     /**
  55      * If the value is not set, and no fallback value is found,
  56      * the parameter uses the value returned by the producer.
  57      */
  58     Function<Map<String, ? super Object>, T> defaultValueFunction;
  59 
  60     /**
  61      * An optional string converter for command line arguments.
  62      */
  63     BiFunction<String, Map<String, ? super Object>, T> stringConverter;
  64 
  65     String getID() {
  66         return id;
  67     }
  68 
  69     Class<T> getValueType() {
  70         return valueType;
  71     }
  72 




  73     boolean getIsDefaultValue() {
  74         return isDefaultValue;
  75     }
  76 
  77     Function<Map<String, ? super Object>, T> getDefaultValueFunction() {
  78         return defaultValueFunction;
  79     }
  80 





  81     BiFunction<String, Map<String, ? super Object>,T>
  82             getStringConverter() {
  83         return stringConverter;





  84     }
  85 
  86     @SuppressWarnings("unchecked")
  87     final T fetchFrom(Map<String, ? super Object> params) {
  88         return fetchFrom(params, true);
  89     }
  90 
  91     @SuppressWarnings("unchecked")
  92     final T fetchFrom(Map<String, ? super Object> params,
  93             boolean invokeDefault) {
  94         Object o = params.get(getID());
  95         if (o instanceof String && getStringConverter() != null) {
  96             return getStringConverter().apply((String)o, params);
  97         }
  98 
  99         Class<T> klass = getValueType();
 100         if (klass.isInstance(o)) {
 101             return (T) o;
 102         }
 103         if (o != null) {