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

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

 // Copyright (C) 2013 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 <libaddressinput/address_validator.h>
 
 #include <libaddressinput/downloader.h>
 #include <libaddressinput/load_rules_delegate.h>
 #include <libaddressinput/localization.h>
 #include <libaddressinput/storage.h>
+#include <libaddressinput/util/basictypes.h>
+#include <libaddressinput/util/scoped_ptr.h>
 
+#include <cassert>
+#include <cstddef>
+#include <map>
+#include <set>
 #include <string>
 
+#include "country_rules_aggregator.h"
 #include "retriever.h"
+#include "ruleset.h"
+#include "util/stl_util.h"
 
 namespace i18n {
 namespace addressinput {
 
-AddressValidator::AddressValidator(scoped_ptr<const Downloader> downloader,
-                                   scoped_ptr<Storage> storage,
-                                   LoadRulesDelegate* load_rules_delegate)
-    : retriever_(new Retriever(
+namespace {
+
+// Validates AddressData structure.
+class AddressValidatorImpl : public AddressValidator {
+ public:
+  // Takes ownership of |downloader| and |storage|. Does not take ownership of
+  // |load_rules_delegate|.
+  AddressValidatorImpl(scoped_ptr<const Downloader> downloader,
+                       scoped_ptr<Storage> storage,
+                       LoadRulesDelegate* load_rules_delegate)
+    : aggregator_(scoped_ptr<Retriever>(new Retriever(
           VALIDATION_DATA_URL,
           downloader.Pass(),
-          scoped_ptr<Storage>(storage.Pass()))),
-      load_rules_delegate_(load_rules_delegate) {}
+          storage.Pass()))),
+      load_rules_delegate_(load_rules_delegate),
+      loading_rules_(),
+      rules_() {}
+
+  virtual ~AddressValidatorImpl() {
+    STLDeleteValues(&rules_);
+  }
+
+  // AddressValidator implementation.
+  virtual void LoadRules(const std::string& country_code) {
+    if (rules_.find(country_code) == rules_.end() &&
+        loading_rules_.find(country_code) == loading_rules_.end()) {
+      loading_rules_.insert(country_code);
+      aggregator_.AggregateRules(
+          country_code,
+          BuildScopedPtrCallback(this, &AddressValidatorImpl::OnRulesLoaded));
+    }
+  }
+
+  // AddressValidator implementation.
+  virtual Status ValidateAddress(
+      const AddressData& address,
+      const AddressProblemFilter& filter,
+      const Localization& localization,
+      AddressProblems* problems) const {
+    // TODO(rouslan): Validate the address.
+    return RULES_UNAVAILABLE;
+  }
+
+ private:
+  // Called when CountryRulesAggregator::AggregateRules loads the |ruleset| for
+  // the |country_code|.
+  void OnRulesLoaded(bool success,
+                     const std::string& country_code,
+                     scoped_ptr<Ruleset> ruleset) {
+    assert(rules_.find(country_code) == rules_.end());
+    loading_rules_.erase(country_code);
+    if (success) {
+      rules_[country_code] = ruleset.release();
+    }
+    if (load_rules_delegate_ != NULL) {
+      load_rules_delegate_->OnAddressValidationRulesLoaded(
+          country_code, success);
+    }
+  }
+
+  // Loads the ruleset for a country code.
+  CountryRulesAggregator aggregator_;
+
+  // An optional delegate to be invoked when a ruleset finishes loading.
+  LoadRulesDelegate* load_rules_delegate_;
+
+  // A set of country codes for which a ruleset is being loaded.
+  std::set<std::string> loading_rules_;
+
+  // A mapping of a country code to the owned ruleset for that country code.
+  std::map<std::string, Ruleset*> rules_;
+
+  DISALLOW_COPY_AND_ASSIGN(AddressValidatorImpl);
+};
+
+}  // namespace
 
 AddressValidator::~AddressValidator() {}
 
-void AddressValidator::LoadRules(const std::string& country_code) {}
-
-AddressValidator::Status AddressValidator::ValidateAddress(
-    const AddressData& address,
-    const AddressProblemFilter& filter,
-    const Localization& localization,
-    AddressProblems* problems) const {
-  return RULES_UNAVAILABLE;
+// static
+scoped_ptr<AddressValidator> AddressValidator::Build(
+    scoped_ptr<const Downloader> downloader,
+    scoped_ptr<Storage> storage,
+    LoadRulesDelegate* load_rules_delegate) {
+  return scoped_ptr<AddressValidator>(new AddressValidatorImpl(
+      downloader.Pass(), storage.Pass(), load_rules_delegate));
 }
 
 }  // namespace addressinput
 }  // namespace i18n