| # |
| # 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 |