From 5ad65919e95dbe849da060a372f720983ffaa09e Mon Sep 17 00:00:00 2001
From: Han Yin <han.yin@arm.com>
Date: Fri, 11 Apr 2025 14:38:56 -0700
Subject: [PATCH] util: implement user preferences utility

---
 .../data/preferences/UserPreferences.kt       | 83 +++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 examples/llama.android/app/src/main/java/com/example/llama/revamp/data/preferences/UserPreferences.kt

diff --git a/examples/llama.android/app/src/main/java/com/example/llama/revamp/data/preferences/UserPreferences.kt b/examples/llama.android/app/src/main/java/com/example/llama/revamp/data/preferences/UserPreferences.kt
new file mode 100644
index 0000000000..2b034de459
--- /dev/null
+++ b/examples/llama.android/app/src/main/java/com/example/llama/revamp/data/preferences/UserPreferences.kt
@@ -0,0 +1,83 @@
+package com.example.llama.revamp.data.preferences
+
+import android.content.Context
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.booleanPreferencesKey
+import androidx.datastore.preferences.core.edit
+import androidx.datastore.preferences.core.longPreferencesKey
+import androidx.datastore.preferences.preferencesDataStore
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+
+/**
+ * Manages user preferences for the application.
+ */
+class UserPreferences(private val context: Context) {
+
+    companion object {
+        private val Context.dataStore: DataStore<Preferences> by preferencesDataStore(name = "settings")
+
+        // Performance monitoring preferences
+        val PERFORMANCE_MONITORING_ENABLED = booleanPreferencesKey("performance_monitoring_enabled")
+        val USE_FAHRENHEIT_TEMPERATURE = booleanPreferencesKey("use_fahrenheit_temperature")
+        val MONITORING_INTERVAL_MS = longPreferencesKey("monitoring_interval_ms")
+
+        // Default values
+        const val DEFAULT_MONITORING_INTERVAL_MS = 5000L
+    }
+
+    /**
+     * Gets whether performance monitoring is enabled.
+     */
+    fun isPerformanceMonitoringEnabled(): Flow<Boolean> {
+        return context.dataStore.data.map { preferences ->
+            preferences[PERFORMANCE_MONITORING_ENABLED] ?: true
+        }
+    }
+
+    /**
+     * Sets whether performance monitoring is enabled.
+     */
+    suspend fun setPerformanceMonitoringEnabled(enabled: Boolean) {
+        context.dataStore.edit { preferences ->
+            preferences[PERFORMANCE_MONITORING_ENABLED] = enabled
+        }
+    }
+
+    /**
+     * Gets whether temperature should be displayed in Fahrenheit.
+     */
+    fun usesFahrenheitTemperature(): Flow<Boolean> {
+        return context.dataStore.data.map { preferences ->
+            preferences[USE_FAHRENHEIT_TEMPERATURE] ?: false
+        }
+    }
+
+    /**
+     * Sets whether temperature should be displayed in Fahrenheit.
+     */
+    suspend fun setUseFahrenheitTemperature(useFahrenheit: Boolean) {
+        context.dataStore.edit { preferences ->
+            preferences[USE_FAHRENHEIT_TEMPERATURE] = useFahrenheit
+        }
+    }
+
+    /**
+     * Gets the monitoring interval in milliseconds.
+     */
+    fun getMonitoringInterval(): Flow<Long> {
+        return context.dataStore.data.map { preferences ->
+            preferences[MONITORING_INTERVAL_MS] ?: DEFAULT_MONITORING_INTERVAL_MS
+        }
+    }
+
+    /**
+     * Sets the monitoring interval in milliseconds.
+     */
+    suspend fun setMonitoringInterval(intervalMs: Long) {
+        context.dataStore.edit { preferences ->
+            preferences[MONITORING_INTERVAL_MS] = intervalMs
+        }
+    }
+}