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#include "rule_retriever.h"
16
17#include <libaddressinput/callback.h>
18#include <libaddressinput/util/basictypes.h>
19#include <libaddressinput/util/scoped_ptr.h>
20
21#include <cassert>
22#include <cstddef>
23#include <string>
24
25#include "retriever.h"
26#include "rule.h"
27
28namespace i18n {
29namespace addressinput {
30
31namespace {
32
33class Helper {
34 public:
35  Helper(const std::string& key,
36         const RuleRetriever::Callback& rule_ready,
37         const Retriever& data_retriever)
38      : rule_ready_(rule_ready),
39        data_retrieved_(BuildCallback(this, &Helper::OnDataRetrieved)) {
40    data_retriever.Retrieve(key, *data_retrieved_);
41  }
42
43 private:
44  ~Helper() {}
45
46  void OnDataRetrieved(bool success,
47                       const std::string& key,
48                       const std::string& data) {
49    Rule rule;
50    if (!success) {
51      rule_ready_(false, key, rule);
52    } else {
53      success = rule.ParseSerializedRule(data);
54      rule_ready_(success, key, rule);
55    }
56    delete this;
57  }
58
59  const RuleRetriever::Callback& rule_ready_;
60  scoped_ptr<Retriever::Callback> data_retrieved_;
61
62  DISALLOW_COPY_AND_ASSIGN(Helper);
63};
64
65}  // namespace
66
67RuleRetriever::RuleRetriever(const Retriever* retriever)
68    : data_retriever_(retriever) {
69  assert(data_retriever_ != NULL);
70}
71
72RuleRetriever::~RuleRetriever() {}
73
74void RuleRetriever::RetrieveRule(const std::string& key,
75                                 const Callback& rule_ready) const {
76  new Helper(key, rule_ready, *data_retriever_);
77}
78
79}  // namespace addressinput
80}  // namespace i18n
81