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#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
module Thrift
class Union
def initialize(name=nil, value=nil)
if name
if name.is_a? Hash
if name.size > 1
raise "#{self.class} cannot be instantiated with more than one field!"
end
name, value = name.keys.first, name.values.first
end
if Thrift.type_checking
raise Exception, "#{self.class} does not contain a field named #{name}!" unless name_to_id(name.to_s)
end
if value.nil?
raise Exception, "Union #{self.class} cannot be instantiated with setfield and nil value!"
end
Thrift.check_type(value, struct_fields[name_to_id(name.to_s)], name) if Thrift.type_checking
elsif !value.nil?
raise Exception, "Value provided, but no name!"
end
@setfield = name
@value = value
end
def inspect
if get_set_field
"<#{self.class} #{@setfield}: #{inspect_field(@value, struct_fields[name_to_id(@setfield.to_s)])}>"
else
"<#{self.class} >"
end
end
def read(iprot)
iprot.read_struct_begin
fname, ftype, fid = iprot.read_field_begin
handle_message(iprot, fid, ftype)
iprot.read_field_end
fname, ftype, fid = iprot.read_field_begin
raise "Too many fields for union" unless (ftype == Types::STOP)
iprot.read_struct_end
validate
end
def write(oprot)
validate
oprot.write_struct_begin(self.class.name)
fid = self.name_to_id(@setfield.to_s)
field_info = struct_fields[fid]
type = field_info[:type]
if is_container? type
oprot.write_field_begin(@setfield, type, fid)
write_container(oprot, @value, field_info)
oprot.write_field_end
else
oprot.write_field(@setfield, type, fid, @value)
end
oprot.write_field_stop
oprot.write_struct_end
end
def ==(other)
other.equal?(self) || other.instance_of?(self.class) && @setfield == other.get_set_field && @value == other.get_value
end
alias_method :eql?, :==
def hash
[self.class.name, @setfield, @value].hash
end
def self.field_accessor(klass, field_info)
klass.send :define_method, field_info[:name] do
if field_info[:name].to_sym == @setfield
@value
else
raise RuntimeError, "#{field_info[:name]} is not union's set field."
end
end
klass.send :define_method, "#{field_info[:name]}=" do |value|
Thrift.check_type(value, field_info, field_info[:name]) if Thrift.type_checking
@setfield = field_info[:name].to_sym
@value = value
end
end
def self.qmark_isset_method(klass, field_info)
klass.send :define_method, "#{field_info[:name]}?" do
get_set_field == field_info[:name].to_sym && !get_value.nil?
end
end
def self.generate_accessors(klass)
klass::FIELDS.values.each do |field_info|
field_accessor(klass, field_info)
qmark_isset_method(klass, field_info)
end
end
# get the symbol that indicates what the currently set field type is.
def get_set_field
@setfield
end
# get the current value of this union, regardless of what the set field is.
# generally, you should only use this method when you don't know in advance
# what field to expect.
def get_value
@value
end
def <=>(other)
if self.class == other.class
if get_set_field == other.get_set_field
if get_set_field.nil?
0
else
get_value <=> other.get_value
end
else
if get_set_field && other.get_set_field.nil?
-1
elsif get_set_field.nil? && other.get_set_field
1
elsif get_set_field.nil? && other.get_set_field.nil?
0
else
name_to_id(get_set_field.to_s) <=> name_to_id(other.get_set_field.to_s)
end
end
else
self.class <=> other.class
end
end
protected
def handle_message(iprot, fid, ftype)
field = struct_fields[fid]
if field and field[:type] == ftype
@value = read_field(iprot, field)
name = field[:name].to_sym
@setfield = name
else
iprot.skip(ftype)
end
end
end
end
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