Add support for Double preference

README.md

@@ -118,7 +118,7 @@ If this validation fails, an `IllegalArgumentException` will be thrown.
 
 # Addons
 
-Krate, by default, supports the types that `SharedPreferences` supports. These are `Boolean`, `Float`, `Int`, `Long`, `String` and `Set<String>`. You may of course want to store additional types in Krate.
+Krate, by default, supports the types that `SharedPreferences` supports. These are `Boolean`, `Float`, `Int`, `Long`, `String` and `Set<String>`. Additionally, Krate supports `Double`. You may of course want to store additional types in Krate.
 
 If you don't find support for the library or type you're looking for, implementing your own delegate in your own project based on the code of existing delegates should be quite simple, this is very much a supported use case. If you think your type might be commonly used, you can also open an issue to ask for an addon library for that type.
 

app/src/main/java/hu/autsoft/krateexample/ExampleActivity.kt

@@ -38,6 +38,7 @@ class ExampleActivity : AppCompatActivity() {
         super.onResume()
 
         booleanPreference.isChecked = exampleSettings.exampleBoolean
+        doublePreferenceInput.setText(exampleSettings.exampleDouble.toString())
         floatPreferenceInput.setText(exampleSettings.exampleFloat.toString())
         intPreferenceInput.setText(exampleSettings.exampleInt.toString())
         longPreferenceInput.setText(exampleSettings.exampleLong.toString())
@@ -49,6 +50,7 @@ class ExampleActivity : AppCompatActivity() {
         super.onPause()
 
         exampleSettings.exampleBoolean = booleanPreference.isChecked
+        exampleSettings.exampleDouble = doublePreferenceInput.text.toString().toDouble()
         exampleSettings.exampleFloat = floatPreferenceInput.text.toString().toFloat()
         exampleSettings.exampleInt = intPreferenceInput.text.toString().toInt()
         exampleSettings.exampleLong = longPreferenceInput.text.toString().toLong()

app/src/main/java/hu/autsoft/krateexample/krates/ExampleCustomKrate.kt

@@ -6,6 +6,7 @@ import android.content.Context
 import android.content.SharedPreferences
 import hu.autsoft.krate.Krate
 import hu.autsoft.krate.booleanPref
+import hu.autsoft.krate.doublePref
 import hu.autsoft.krate.floatPref
 import hu.autsoft.krate.intPref
 import hu.autsoft.krate.longPref
@@ -21,6 +22,7 @@ class ExampleCustomKrate(context: Context) : Krate, ExampleSettings {
     }
 
     override var exampleBoolean by booleanPref("exampleBoolean", false)
+    override var exampleDouble by doublePref("exampleDouble", 0.0)
     override var exampleFloat by floatPref("exampleFloat", 0f)
     override var exampleInt by intPref("exampleInt", 0)
     override var exampleLong by longPref("exampleLong", 0L)

app/src/main/java/hu/autsoft/krateexample/krates/ExampleSettings.kt

@@ -2,6 +2,7 @@ package hu.autsoft.krateexample.krates
 
 interface ExampleSettings {
     var exampleBoolean: Boolean
+    var exampleDouble: Double
     var exampleFloat: Float
     var exampleInt: Int
     var exampleLong: Long

app/src/main/java/hu/autsoft/krateexample/krates/ExampleSimpleKrate.kt

@@ -3,6 +3,7 @@ package hu.autsoft.krateexample.krates
 import android.content.Context
 import hu.autsoft.krate.SimpleKrate
 import hu.autsoft.krate.booleanPref
+import hu.autsoft.krate.doublePref
 import hu.autsoft.krate.floatPref
 import hu.autsoft.krate.intPref
 import hu.autsoft.krate.longPref
@@ -16,6 +17,7 @@ class ExampleSimpleKrate(context: Context) : SimpleKrate(context, NAME), Example
     }
 
     override var exampleBoolean by booleanPref("exampleBoolean", false)
+    override var exampleDouble by doublePref("exampleDouble", 0.0)
     override var exampleFloat by floatPref("exampleFloat", 0f)
     override var exampleInt by intPref("exampleInt", 0)
     override var exampleLong by longPref("exampleLong", 0L)

app/src/main/res/layout/activity_example.xml

@@ -22,7 +22,7 @@
             app:layout_constraintTop_toTopOf="parent" />
 
         <com.google.android.material.textfield.TextInputLayout
-            android:id="@+id/floatPreference"
+            android:id="@+id/doublePreference"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_margin="8dp"
@@ -31,6 +31,25 @@
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/booleanPreference">
 
+            <com.google.android.material.textfield.TextInputEditText
+                android:id="@+id/doublePreferenceInput"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:hint="Double"
+                android:inputType="numberDecimal" />
+
+        </com.google.android.material.textfield.TextInputLayout>
+
+        <com.google.android.material.textfield.TextInputLayout
+            android:id="@+id/floatPreference"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_margin="8dp"
+            android:layout_marginTop="4dp"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/doublePreference">
+
             <com.google.android.material.textfield.TextInputEditText
                 android:id="@+id/floatPreferenceInput"
                 android:layout_width="match_parent"

krate/src/main/kotlin/hu/autsoft/krate/Functions.kt

@@ -3,12 +3,14 @@
 package hu.autsoft.krate
 
 import hu.autsoft.krate.default.BooleanDelegateWithDefault
+import hu.autsoft.krate.default.DoubleDelegateWithDefault
 import hu.autsoft.krate.default.FloatDelegateWithDefault
 import hu.autsoft.krate.default.IntDelegateWithDefault
 import hu.autsoft.krate.default.LongDelegateWithDefault
 import hu.autsoft.krate.default.StringDelegateWithDefault
 import hu.autsoft.krate.default.StringSetDelegateWithDefault
 import hu.autsoft.krate.optional.BooleanDelegate
+import hu.autsoft.krate.optional.DoubleDelegate
 import hu.autsoft.krate.optional.FloatDelegate
 import hu.autsoft.krate.optional.IntDelegate
 import hu.autsoft.krate.optional.LongDelegate
@@ -23,6 +25,13 @@ public fun Krate.booleanPref(key: String): ReadWriteProperty<Krate, Boolean?> {
     return BooleanDelegate(key)
 }
 
+/**
+ * Creates an option preference of type Double with the given [key] in this [Krate] instance.
+ */
+public fun Krate.doublePref(key: String): ReadWriteProperty<Krate, Double?> {
+    return DoubleDelegate(key)
+}
+
 /**
  * Creates an optional preference of type [Float] with the given [key] in this [Krate] instance.
  */
@@ -66,6 +75,13 @@ public fun Krate.booleanPref(key: String, defaultValue: Boolean): ReadWritePrope
     return BooleanDelegateWithDefault(key, defaultValue)
 }
 
+/**
+ * Creates a non-option preference of type Double with the given [key] and [defaultValue] in this [Krate] instance.
+ */
+public fun Krate.doublePref(key: String, defaultValue: Double): ReadWriteProperty<Krate, Double> {
+    return DoubleDelegateWithDefault(key, defaultValue)
+}
+
 /**
  * Creates a non-optional preference of type [Float] with the given [key] and [defaultValue] in this [Krate] instance.
  */

krate/src/main/kotlin/hu/autsoft/krate/default/DoubleDelegateWithDefault.kt

@@ -0,0 +1,26 @@
+package hu.autsoft.krate.default
+
+import hu.autsoft.krate.Krate
+import hu.autsoft.krate.util.edit
+import hu.autsoft.krate.util.getDouble
+import hu.autsoft.krate.util.putDouble
+import kotlin.properties.ReadWriteProperty
+import kotlin.reflect.KProperty
+
+internal class DoubleDelegateWithDefault(
+        private val key: String,
+        private val default: Double
+) : ReadWriteProperty<Krate, Double> {
+
+    override operator fun getValue(thisRef: Krate, property: KProperty<*>): Double {
+        return if (thisRef.sharedPreferences.contains(key)) {
+            thisRef.sharedPreferences.getDouble(key, default)
+        } else {
+            default
+        }
+    }
+
+    override operator fun setValue(thisRef: Krate, property: KProperty<*>, value: Double) {
+        thisRef.sharedPreferences.edit { putDouble(key, value) }
+    }
+}

krate/src/main/kotlin/hu/autsoft/krate/optional/DoubleDelegate.kt

@@ -0,0 +1,31 @@
+package hu.autsoft.krate.optional
+
+import hu.autsoft.krate.Krate
+import hu.autsoft.krate.util.edit
+import hu.autsoft.krate.util.getDouble
+import hu.autsoft.krate.util.putDouble
+import kotlin.properties.ReadWriteProperty
+import kotlin.reflect.KProperty
+
+internal class DoubleDelegate(
+        private val key: String
+) : ReadWriteProperty<Krate, Double?> {
+
+    override operator fun getValue(thisRef: Krate, property: KProperty<*>): Double? {
+        return if (!thisRef.sharedPreferences.contains(key)) {
+            null
+        } else {
+            thisRef.sharedPreferences.getDouble(key, 0.0)
+            //thisRef.sharedPreferences.getLong(key, 0.0.toRawBits()).toDouble()
+        }
+    }
+
+    override fun setValue(thisRef: Krate, property: KProperty<*>, value: Double?) {
+        if (value == null) {
+            thisRef.sharedPreferences.edit { remove(key) }
+        } else {
+            thisRef.sharedPreferences.edit { putDouble(key, value) }
+            //thisRef.sharedPreferences.edit { putLong(key, value.toRawBits()) }
+        }
+    }
+}

krate/src/main/kotlin/hu/autsoft/krate/util/SharedPrefExtensions.kt

@@ -7,3 +7,9 @@ internal inline fun SharedPreferences.edit(edits: SharedPreferences.Editor.() ->
     editor.edits()
     editor.apply()
 }
+
+internal fun SharedPreferences.Editor.putDouble(key: String, double: Double) =
+        putLong(key, java.lang.Double.doubleToRawLongBits(double))
+
+internal fun SharedPreferences.getDouble(key: String, default: Double) =
+        java.lang.Double.longBitsToDouble(getLong(key, java.lang.Double.doubleToRawLongBits(default)))

krate/src/test/java/hu/autsoft/krate/TestKrate.kt

@@ -10,6 +10,7 @@ internal class TestKrate(context: Context) : SimpleKrate(context) {
     }
 
     var optionalBoolean by booleanPref("optionalBoolean")
+    var optionDouble by doublePref("optionalDouble")
     var optionalFloat by floatPref("optionalFloat")
     var optionalInt by intPref("optionalInt")
     var optionalLong by longPref("optionalLong")

krate/src/test/java/hu/autsoft/krate/test/OptionalTests.kt

@@ -33,6 +33,20 @@ internal class OptionalTests {
         assertEquals(null, testKrate.optionalBoolean)
     }
 
+    @Test
+    fun testOptionalDoublePref() {
+        assertEquals(null, testKrate.optionDouble)
+
+        testKrate.optionDouble = -487741.0
+        assertEquals(-487741.0, testKrate.optionDouble)
+
+        testKrate.optionDouble = 215125.0
+        assertEquals(215125.0, testKrate.optionDouble)
+
+        testKrate.optionDouble = null
+        assertEquals(null, testKrate.optionDouble)
+    }
+
     @Test
     fun testOptionalFloatPref() {
         assertEquals(null, testKrate.optionalFloat)