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Contents
require 'xml/mapping'
module XML
module MappingExtensions
# Base class for simple single-attribute nodes that convert
# XML strings to object values.
#
# Usage:
# - extend this class
# - override `to_value` (and, optionally, `to_xml_text`) to do your conversion
# - call `::XML::Mapping.add_node_class` to add your new node class
class NodeBase < ::XML::Mapping::SingleAttributeNode
# See `::XML::Mapping::SingleAttributeNode#initialize`
def initialize(*args)
path, *args = super(*args)
@path = ::XML::XXPath.new(path)
args
end
# Implements `::XML::Mapping::SingleAttributeNode#extract_attr_value`.
# @param xml [Element] The XML element to extract the value from
# @return [Object, nil] the mapped value, or nil if
def extract_attr_value(xml)
xml_text = default_when_xpath_err { @path.first(xml).text }
to_value(xml_text) if xml_text
end
# Implements `::XML::Mapping::SingleAttributeNode#set_attr_value`.
# The object value is passed to `to_xml_text` for string conversion.
# @param xml [Element] The XML element to write to
# @param value [Object] The value to write
def set_attr_value(xml, value)
text = to_xml_text(value)
@path.first(xml, ensure_created: true).text = text
end
# Override this method to convert XML text to an object value
# @param _xml_text [String] The XML string to parse
# @return [Object] The object value
def to_value(_xml_text)
fail NoMethodError, "#{self.class} should override #to_value to convert an XML string to an object value"
end
# Override this method to convert object values to XML text.
# The default implementation simply calls `to_s`.
# @param value [Object] The object value to convert
# @return [String] The XML string to write
def to_xml_text(value)
value.to_s
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems