[rac] Download all rules for a country code in libaddressinput.

third_party/libaddressinput/chromium/cpp/src/country_rules_aggregator.cc

+// Copyright (C) 2014 Google Inc.
+//
+// Licensed 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.
+
+#include "country_rules_aggregator.h"
+
+#include <libaddressinput/address_field.h>
+#include <libaddressinput/callback.h>
+#include <libaddressinput/util/basictypes.h>
+#include <libaddressinput/util/scoped_ptr.h>
+
+#include <cassert>
+#include <cstddef>
+#include <map>
+#include <string>
+#include <utility>
+
+#include "retriever.h"
+#include "rule.h"
+#include "ruleset.h"
+#include "util/stl_util.h"
+
+namespace i18n {
+namespace addressinput {
+
+// Information about data requests sent to Retriever. This data is not returned
+// as part of the ruleset, but is useful in constructing the ruleset
+// asynchronously.
+struct CountryRulesAggregator::RequestData {
+  // Does not take ownership of |parent|.
+  RequestData(Ruleset* parent,
+              AddressField level,
+              bool is_language_code,
+              const std::string& id)
+      : parent(parent),
+        level(level),
+        is_language_code(is_language_code),
+        id(id) {
+    assert(parent != NULL || level == COUNTRY);
+  }
+
+  ~RequestData() {}
+
+  // The parent ruleset of the data being downloaded. If NULL, then this is the
+  // root ruleset at the COUNTRY level. The language-specific and sub-region
+  // rules are added to this ruleset. Owned by |CountryRulesRetriever|.
+  Ruleset* parent;
+
+  // The level of the data being requested. Ranges from COUNTRY to
+  // DEPENDENT_LOCALITY. If COUNTRY, then the rule should use default rules from
+  // Rule::GetDefault().
+  AddressField level;
+
+  // If true, then |id| is a language. The data received for this request should
+  // be placed into a language-specific rule.
+  bool is_language_code;
+
+  // Can be a region name (e.g. "CA") or a language (e.g. "fr"). Used to add a
+  // sub-region or a language-specific rule to |parent|.
+  std::string id;
+};
+
+CountryRulesAggregator::CountryRulesAggregator(scoped_ptr<Retriever> retriever)
+    : retriever_(retriever.Pass()),
+      requests_(),
+      country_code_(),
+      rules_ready_(),
+      root_(),
+      default_language_(),
+      languages_() {
+  assert(retriever_ != NULL);
+}
+
+CountryRulesAggregator::~CountryRulesAggregator() {}
+
+void CountryRulesAggregator::AggregateRules(const std::string& country_code,
+                                            scoped_ptr<Callback> rules_ready) {
+  Reset();
+  country_code_ = country_code;
+  rules_ready_.reset(rules_ready.release());
+
+  // Key construction:
+  // https://code.google.com/p/libaddressinput/wiki/AddressValidationMetadata
+  // Example of a country-level key: "data/CA".
+  std::string key = "data/" + country_code_;
+  requests_.insert(std::make_pair(
+      key, RequestData(NULL, COUNTRY, false, std::string())));
+
+  retriever_->Retrieve(
+      key, BuildCallback(this, &CountryRulesAggregator::OnDataReady));
+}
+
+void CountryRulesAggregator::OnDataReady(bool success,
+                                         const std::string& key,
+                                         const std::string& data) {
+  std::map<std::string, RequestData>::iterator request_it =
+      requests_.find(key);
+  if (request_it == requests_.end()) {
+    return;  // An abandoned request.
+  }
+
+  if (!success) {
+    (*rules_ready_)(false, country_code_, scoped_ptr<Ruleset>());
+    Reset();
+    return;
+  }
+
+  RequestData request = request_it->second;
+  requests_.erase(request_it);
+
+  // All country-level rules are based on the default rule.
+  scoped_ptr<Rule> rule(new Rule);
+  if (request.level == COUNTRY) {
+    rule->CopyFrom(Rule::GetDefault());
+  }
+
+  if (!rule->ParseSerializedRule(data)) {
+    (*rules_ready_)(false, country_code_, scoped_ptr<Ruleset>());
+    Reset();
+    return;
+  }
+
+  // Place the rule in the correct location in the ruleset.
+  Ruleset* ruleset = NULL;
+  if (request.is_language_code) {
+    assert(request.parent != NULL);
+    request.parent->AddLanguageCodeRule(request.id, rule.Pass());
+    ruleset = request.parent;
+  } else if (request.level == COUNTRY) {
+    // The default language and all supported languages for the country code are
+    // in the country-level rule without a language code identifier. For
+    // example: "data/CA".
+    default_language_ = rule->GetLanguage();
+    languages_ = rule->GetLanguages();
+
+    root_.reset(new Ruleset(rule.Pass()));
+    ruleset = root_.get();
+  } else {
+    assert(request.parent != NULL);
+    ruleset = request.parent->AddSubRegionRuleset(request.id, rule.Pass());
+  }
+
+  if (!request.is_language_code) {
+    // Retrieve the language-specific rules for this region.
+    for (std::vector<std::string>::const_iterator
+             lang_it = languages_.begin();
+         lang_it != languages_.end();
+         ++lang_it) {
+      if (*lang_it == default_language_) {
+        continue;
+      }
+      // Example of a language-specific key: "data/CA--fr".
+      std::string language_code_key = key + "--" + *lang_it;
+      requests_.insert(std::make_pair(
+          key, RequestData(ruleset, request.level, true, *lang_it)));
+      retriever_->Retrieve(
+          language_code_key,
+          BuildCallback(this, &CountryRulesAggregator::OnDataReady));
+    }
+
+    if (request.level < DEPENDENT_LOCALITY) {
+      // Retrieve the sub-region rules for this region.
+      for (std::vector<std::string>::const_iterator
+               subkey_it = ruleset->rule().GetSubKeys().begin();
+           subkey_it != ruleset->rule().GetSubKeys().end();
+           ++subkey_it) {
+        // Example of a sub-region key: "data/CA/AB".
+        std::string sub_region_key = key + "/" + *subkey_it;
+        requests_.insert(std::make_pair(
+            key,
+            RequestData(ruleset,
+                        static_cast<AddressField>(request.level + 1),
+                        false,
+                        *subkey_it)));
+        retriever_->Retrieve(
+            sub_region_key,
+            BuildCallback(this, &CountryRulesAggregator::OnDataReady));
+      }
+    }
+  }
+
+  if (requests_.empty()) {
+    (*rules_ready_)(true, country_code_, root_.Pass());
+    Reset();
+  }
+}
+
+void CountryRulesAggregator::Reset() {
+  requests_.clear();
+  country_code_.clear();
+  rules_ready_.reset();
+  root_.reset();
+  default_language_.clear();
+  languages_.clear();
+}
+
+}  // namespace addressinput
+}  // namespace i18n