1// Copyright (C) 2013 Google Inc.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14//
15// An object to retrieve validation rules.
16
17#ifndef I18N_ADDRESSINPUT_RULE_RETRIEVER_H_
18#define I18N_ADDRESSINPUT_RULE_RETRIEVER_H_
19
20#include <libaddressinput/callback.h>
21#include <libaddressinput/util/basictypes.h>
22#include <libaddressinput/util/scoped_ptr.h>
23
24#include <string>
25
26namespace i18n {
27namespace addressinput {
28
29class Retriever;
30class Rule;
31
32// Retrieves validation rules. Sample usage:
33//    const Retriever* retriever = ...
34//    RuleRetriever rules(retriever);
35//    const scoped_ptr<const RuleRetriever::Callback> rule_ready(
36//        BuildCallback(this, &MyClass::OnRuleReady));
37//    rules.RetrieveRule("data/CA/AB--fr", *rule_ready);
38class RuleRetriever {
39 public:
40  typedef i18n::addressinput::Callback<const std::string&,
41                                       const Rule&> Callback;
42
43  // Takes ownership of |retriever|.
44  explicit RuleRetriever(const Retriever* retriever);
45  ~RuleRetriever();
46
47  // Retrieves the rule for |key| and invokes the |rule_ready| callback.
48  void RetrieveRule(const std::string& key, const Callback& rule_ready) const;
49
50 private:
51  scoped_ptr<const Retriever> data_retriever_;
52
53  DISALLOW_COPY_AND_ASSIGN(RuleRetriever);
54};
55
56}  // namespace addressinput
57}  // namespace i18n
58
59#endif  // I18N_ADDRESSINPUT_RULE_RETRIEVER_H_
60