64     OptionDescriptor get(String optionName);
  65 
  66     /**
  67      * Create a union options descriptor out of multiple given descriptors. The operation
  68      * descriptors are not checked for duplicate keys. The option descriptors are iterated in
  69      * declaration order.
  70      *
  71      * @since 1.0
  72      */
  73     static OptionDescriptors createUnion(OptionDescriptors... descriptors) {
  74         if (descriptors.length == 0) {
  75             return EMPTY;
  76         } else if (descriptors.length == 1) {
  77             return descriptors[0];
  78         } else {
  79             return new UnionOptionDescriptors(descriptors);
  80         }
  81     }
  82 
  83     /**








  84      * Create an {@link OptionDescriptors} instance from a list. The option descriptors
  85      * implementation is backed by a {@link LinkedHashMap} that preserves ordering.
  86      *
  87      * @since 1.0
  88      */
  89     static OptionDescriptors create(List<OptionDescriptor> descriptors) {
  90         if (descriptors == null || descriptors.isEmpty()) {
  91             return EMPTY;
  92         }
  93         return new OptionDescriptorsMap(descriptors);
  94     }
  95 }
  96 
  97 class OptionDescriptorsMap implements OptionDescriptors {
  98 
  99     final Map<String, OptionDescriptor> descriptors = new LinkedHashMap<>();
 100 
 101     OptionDescriptorsMap(List<OptionDescriptor> descriptorList) {
 102         for (OptionDescriptor descriptor : descriptorList) {
 103             descriptors.put(descriptor.getName(), descriptor);

  64     OptionDescriptor get(String optionName);
  65 
  66     /**
  67      * Create a union options descriptor out of multiple given descriptors. The operation
  68      * descriptors are not checked for duplicate keys. The option descriptors are iterated in
  69      * declaration order.
  70      *
  71      * @since 1.0
  72      */
  73     static OptionDescriptors createUnion(OptionDescriptors... descriptors) {
  74         if (descriptors.length == 0) {
  75             return EMPTY;
  76         } else if (descriptors.length == 1) {
  77             return descriptors[0];
  78         } else {
  79             return new UnionOptionDescriptors(descriptors);
  80         }
  81     }
  82 
  83     /**
  84      * {@inheritDoc}
  85      *
  86      * @since 1.0
  87      */
  88     @Override
  89     Iterator<OptionDescriptor> iterator();
  90 
  91     /**
  92      * Create an {@link OptionDescriptors} instance from a list. The option descriptors
  93      * implementation is backed by a {@link LinkedHashMap} that preserves ordering.
  94      *
  95      * @since 1.0
  96      */
  97     static OptionDescriptors create(List<OptionDescriptor> descriptors) {
  98         if (descriptors == null || descriptors.isEmpty()) {
  99             return EMPTY;
 100         }
 101         return new OptionDescriptorsMap(descriptors);
 102     }
 103 }
 104 
 105 class OptionDescriptorsMap implements OptionDescriptors {
 106 
 107     final Map<String, OptionDescriptor> descriptors = new LinkedHashMap<>();
 108 
 109     OptionDescriptorsMap(List<OptionDescriptor> descriptorList) {
 110         for (OptionDescriptor descriptor : descriptorList) {
 111             descriptors.put(descriptor.getName(), descriptor);