Add support for removing preferences using key prefix.

PiperOrigin-RevId: 875366484

internal/platform/implementation/apple/preferences_manager.h

@@ -90,6 +90,8 @@ class PreferencesManager : public nearby::api::PreferencesManager {
 
   // Removes preferences
   void Remove(absl::string_view key) override;
+  // TODO: b/485304482 - Implement this method if needed..
+  bool RemoveKeyPrefix(absl::string_view prefix) override { return false; }
 };
 
 }  // namespace nearby::apple

internal/platform/implementation/g3/preferences_manager.cc

@@ -177,6 +177,19 @@ void PreferencesManager::Remove(absl::string_view key) {
   value_.erase(absl::StrCat(key));
 }
 
+bool PreferencesManager::RemoveKeyPrefix(absl::string_view prefix) {
+  absl::MutexLock lock(mutex_);
+  auto it = value_.begin();
+  while (it != value_.end()) {
+    if (it.key().starts_with(prefix)) {
+      it = value_.erase(it);
+    } else {
+      ++it;
+    }
+  }
+  return true;
+}
+
 // Private methods
 
 // Writes data to storage.

internal/platform/implementation/g3/preferences_manager.h

@@ -108,6 +108,8 @@ class PreferencesManager : public api::PreferencesManager {
 
   // Removes preferences
   void Remove(absl::string_view key) override ABSL_LOCKS_EXCLUDED(mutex_);
+  bool RemoveKeyPrefix(absl::string_view prefix) override
+      ABSL_LOCKS_EXCLUDED(mutex_);
 
  private:
   // Writes data to storage.

internal/platform/implementation/preferences_manager.h

@@ -85,6 +85,10 @@ class PreferencesManager {
 
   // Removes preferences
   virtual void Remove(absl::string_view key) = 0;
+
+  // Removes all preferences that start with the given prefix.
+  // Returns false on error.
+  virtual bool RemoveKeyPrefix(absl::string_view prefix) = 0;
 };
 
 }  // namespace api

internal/platform/implementation/windows/preferences_manager.cc

@@ -176,6 +176,19 @@ void PreferencesManager::Remove(absl::string_view key) {
   value_.erase(absl::StrCat(key));
 }
 
+bool PreferencesManager::RemoveKeyPrefix(absl::string_view prefix) {
+  absl::MutexLock lock(mutex_);
+  auto it = value_.begin();
+  while (it != value_.end()) {
+    if (it.key().starts_with(prefix)) {
+      it = value_.erase(it);
+    } else {
+      ++it;
+    }
+  }
+  return true;
+}
+
 // Private methods
 
 // Writes data to storage.

internal/platform/implementation/windows/preferences_manager.h

@@ -108,6 +108,8 @@ class PreferencesManager : public api::PreferencesManager {
 
   // Removes preferences
   void Remove(absl::string_view key) override ABSL_LOCKS_EXCLUDED(mutex_);
+  bool RemoveKeyPrefix(absl::string_view prefix) override
+      ABSL_LOCKS_EXCLUDED(mutex_);
 
  private:
   // Writes data to storage.

internal/platform/implementation/windows/preferences_manager_test.cc

@@ -21,7 +21,10 @@
 #include <string>
 #include <vector>
 
+#include "gmock/gmock.h"
+#include "protobuf-matchers/protocol-buffer-matchers.h"
 #include "gtest/gtest.h"
+#include "absl/strings/str_cat.h"
 #include "absl/strings/string_view.h"
 #include "absl/time/clock.h"
 #include "absl/time/time.h"
@@ -35,6 +38,8 @@
 namespace nearby {
 namespace windows {
 namespace {
+using ::testing::IsEmpty;
+
 using json = ::nlohmann::json;
 constexpr absl::string_view kPreferencesFilePath = "Google/Nearby/Sharing";
 }  // namespace
@@ -184,5 +189,23 @@ TEST(PreferencesManager, RemoveKey) {
   EXPECT_EQ(result, "default key");
 }
 
+TEST(PreferencesManager, RemoveKeyPrefix) {
+  constexpr absl::string_view kKeyPrefix = "test_key_prefix.";
+  auto pm = PreferencesManager(FilePath{kPreferencesFilePath});
+  for (int i = 0; i < 10; ++i) {
+    pm.SetString(absl::StrCat(kKeyPrefix, i), absl::StrCat("value", i));
+  }
+  constexpr absl::string_view string_key = "string_key";
+  pm.SetString(string_key, "this is a test string");
+  EXPECT_EQ(pm.GetString(string_key, ""), "this is a test string");
+
+  EXPECT_TRUE(pm.RemoveKeyPrefix(kKeyPrefix));
+  for (int i = 0; i < 10; ++i) {
+    EXPECT_THAT(pm.GetString(absl::StrCat(kKeyPrefix, i), ""),
+              IsEmpty());
+  }
+  EXPECT_EQ(pm.GetString(string_key, ""), "this is a test string");
+}
+
 }  // namespace windows
 }  // namespace nearby