Module: SaxStream::Mapper::ClassMethods

Defined in:
lib/sax_stream/mapper.rb

Instance Method Summary collapse

Instance Method Details

#attribute_group(group_name) ⇒ Object 



25
26
27
28
29
30
 
# File 'lib/sax_stream/mapper.rb', line 25

def attribute_group(group_name)
  self.mapping_options = {group_name: group_name}
  yield
ensure
  clear_mapping_options
end

#child_handler_for(key, attributes, collector, handler_stack, current_object) ⇒ Object 



97
98
99
100
101
102
 
# File 'lib/sax_stream/mapper.rb', line 97

def child_handler_for(key, attributes, collector, handler_stack, current_object)
  mapping = field_mapping(key, attributes)
  if mapping
    mapping.handler_for(key, collector, handler_stack, current_object)
  end
end

#field_mapping(key, attributes = []) ⇒ Object 



121
122
123
 
# File 'lib/sax_stream/mapper.rb', line 121

def field_mapping(key, attributes = [])
  field_mappings.field_mapping(key, attributes) || parent_field_mapping(key, attributes)
end

#group_keys(group_name) ⇒ Object 



116
117
118
119
 
# File 'lib/sax_stream/mapper.rb', line 116

def group_keys(group_name)
  @group_keys ||= {}
  @group_keys[group_name] ||= []
end

#map(attribute_name, options = {}) ⇒ Object 



19
20
21
22
23
 
# File 'lib/sax_stream/mapper.rb', line 19

def map(attribute_name, options = {})
  store_key_for_group attribute_name
  mapping = Internal::MappingFactory.build_mapping(attribute_name, options)
  store_field_mapping(options[:to], mapping)
end

#map_attribute_onto_object(object, key, value) ⇒ Object 



77
78
79
 
# File 'lib/sax_stream/mapper.rb', line 77

def map_attribute_onto_object(object, key, value)
  map_key_onto_object(object, "@#{key}", value)
end

#map_element_stack_top_onto_object(object, element_stack) ⇒ Object 



81
82
83
84
85
86
 
# File 'lib/sax_stream/mapper.rb', line 81

def map_element_stack_top_onto_object(object, element_stack)
  map_key_onto_object(object, element_stack.path, element_stack.content, element_stack.relative_attributes)
  element_stack.attributes.each do |key, value|
    map_key_onto_object(object, key, value)
  end
end

#map_key_onto_object(object, key, value, attributes = []) ⇒ Object 



88
89
90
91
92
93
94
95
 
# File 'lib/sax_stream/mapper.rb', line 88

def map_key_onto_object(object, key, value, attributes = [])
  if value
    mapping = field_mapping(key, attributes)
    if mapping
      mapping.map_value_onto_object(object, value)
    end
  end
end

#mappings ⇒ Object 



108
109
110
 
# File 'lib/sax_stream/mapper.rb', line 108

def mappings
  @mappings_incuding_inherited ||= parent_class_values(:mappings, CoreExtensions::OrderedHash.new).merge(class_mappings).freeze
end

#maps_node?(name) ⇒ Boolean

Returns:

  • (Boolean) 


73
74
75
 
# File 'lib/sax_stream/mapper.rb', line 73

def maps_node?(name)
  @node_name == name || @node_name == '*'
end

#node(name, options = {}) ⇒ Object 



14
15
16
17
 
# File 'lib/sax_stream/mapper.rb', line 14

def node(name, options = {})
  @node_name = name
  @collect = options.has_key?(:collect) ? options[:collect] : true
end

#node_name ⇒ Object 



69
70
71
 
# File 'lib/sax_stream/mapper.rb', line 69

def node_name
  @node_name
end

#relate(attribute_name, options = {}) ⇒ Object

Define a relation to another object which is built from an XML node using another class which also includes SaxStream::Mapper.

attribute_name

The name of the attribute on your object that the related objects will be stored in.

options

An options hash which can accept the following-

[:to] Default value: "*"
      The path to the XML which defines an instance of this related node. This
      is a bit like an XPath expression, but not quite. See the README for examples.
      For relations, this can include a wildcard "*" as the last part of the path,
      eg: "product/review/*". If the path is just set to "*" then this will match
      any immediate child of the current node, which is good for polymorphic collections.
      You can also specify an array of strings to match against multiple paths, for example,
      to: ['/images/*', 'files/*', 'base_image']
[:as] Required, no default value.
      Needs to be a class which includes SaxStream::Mapper, or an array of such classes.
      Using an array of classes, even if the array only has one item, denotes that an
      array of related items are expected. Calling @object.relations['name'] will return
      an array which will be empty if nothing is found. If a singular value is used for
      the :as option, then the relation will be assumed to be singular, and so it will
      be nil or the expected class (and will raise an error if multiples are in the file).
[:parent_collects] Default value: false
      Set to true if the object defining this relationship (ie, the parent
      in the relationship) needs to collect the defined children. If so, the
      parent object will be used as the collector for these children, and they
      will not be passed to the collector supplied to the parser. Use this when
      the child objects are not something you want to process on their own, but
      instead you want them all to be loaded into the parent which will then be
      collected as normal. If this is left false, then the parent ojbect will
      not be informed of it's children, because they will be passed to the collector
      and then forgotten about. However, the children will know about their parent,
      or at least what is known about it, but the parent will not be finished being
      parsed. The parent will have already parsed all XML attributes though.



64
65
66
67
 
# File 'lib/sax_stream/mapper.rb', line 64

def relate(attribute_name, options = {})
  options[:to] ||= '*'
  store_relation_mapping(options[:to], Internal::MappingFactory.build_relation(attribute_name, options))
end

#relation_mappings ⇒ Object 



104
105
106
 
# File 'lib/sax_stream/mapper.rb', line 104

def relation_mappings
  (class_relation_mappings + parent_class_values(:relation_mappings, [])).freeze
end

#should_collect? ⇒ Boolean

Returns:

  • (Boolean) 


112
113
114
 
# File 'lib/sax_stream/mapper.rb', line 112

def should_collect?
  @collect
end