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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.
#
class Class
def fields(*fields)
module_eval {
def initialize(*args, &block)
args = init_fields(*args)
if respond_to? :init
init(*args) {|*a| yield(*a)}
elsif args.any?
raise ArgumentError, "extra arguments: #{args.inspect}"
end
end
}
vars = fields.map {|f| :"@#{f.to_s().chomp("?")}"}
define_method(:init_fields) {|*args|
vars.each {|v|
instance_variable_set(v, args.shift())
}
args
}
vars.each_index {|i|
define_method(fields[i]) {
instance_variable_get(vars[i])
}
}
end
end
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