util: Start converting to Kotlin

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

4 files changed, 48 insertions, 66 deletions

diff --git a/ui/src/main/java/com/wireguard/android/util/ExceptionLoggers.java b/ui/src/main/java/com/wireguard/android/util/ExceptionLoggers.java
deleted file mode 100644
index 8a58afbe..00000000
--- a/ui/src/main/java/com/wireguard/android/util/ExceptionLoggers.java
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
- * Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
- * SPDX-License-Identifier: Apache-2.0
- */
-
-package com.wireguard.android.util;
-
-import android.util.Log;
-
-import androidx.annotation.Nullable;
-import java9.util.function.BiConsumer;
-
-/**
- * Helpers for logging exceptions from asynchronous tasks. These can be passed to
- * {@code CompletionStage.whenComplete()} at the end of an asynchronous future chain.
- */
-
-public enum ExceptionLoggers implements BiConsumer<Object, Throwable> {
-    D(Log.DEBUG),
-    E(Log.ERROR);
-
-    private static final String TAG = "WireGuard/" + ExceptionLoggers.class.getSimpleName();
-    private final int priority;
-
-    ExceptionLoggers(final int priority) {
-        this.priority = priority;
-    }
-
-    @Override
-    public void accept(final Object result, @Nullable final Throwable throwable) {
-        if (throwable != null)
-            Log.println(Log.ERROR, TAG, Log.getStackTraceString(throwable));
-        else if (priority <= Log.DEBUG)
-            Log.println(priority, TAG, "Future completed successfully");
-    }
-}
diff --git a/ui/src/main/java/com/wireguard/android/util/ExceptionLoggers.kt b/ui/src/main/java/com/wireguard/android/util/ExceptionLoggers.kt
new file mode 100644
index 00000000..3fe56128
--- /dev/null
+++ b/ui/src/main/java/com/wireguard/android/util/ExceptionLoggers.kt
@@ -0,0 +1,27 @@
+/*
+ * Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package com.wireguard.android.util
+
+import android.util.Log
+import java9.util.function.BiConsumer
+
+/**
+ * Helpers for logging exceptions from asynchronous tasks. These can be passed to
+ * `CompletionStage.whenComplete()` at the end of an asynchronous future chain.
+ */
+enum class ExceptionLoggers(private val priority: Int) : BiConsumer<Any?, Throwable?> {
+    D(Log.DEBUG), E(Log.ERROR);
+
+    override fun accept(result: Any?, throwable: Throwable?) {
+        if (throwable != null)
+            Log.println(Log.ERROR, TAG, Log.getStackTraceString(throwable))
+        else if (priority <= Log.DEBUG)
+            Log.println(priority, TAG, "Future completed successfully")
+    }
+
+    companion object {
+        private val TAG = "WireGuard/" + ExceptionLoggers::class.java.simpleName
+    }
+}
diff --git a/ui/src/main/java/com/wireguard/android/util/FragmentUtils.java b/ui/src/main/java/com/wireguard/android/util/FragmentUtils.java
deleted file mode 100644
index f93fd60d..00000000
--- a/ui/src/main/java/com/wireguard/android/util/FragmentUtils.java
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
- * SPDX-License-Identifier: Apache-2.0
- */
-package com.wireguard.android.util;
-
-import android.content.Context;
-import android.view.ContextThemeWrapper;
-
-import com.wireguard.android.activity.SettingsActivity;
-import com.wireguard.util.NonNullForAll;
-
-import androidx.preference.Preference;
-
-@NonNullForAll
-public final class FragmentUtils {
-    private FragmentUtils() {
-        // Prevent instantiation
-    }
-
-    public static SettingsActivity getPrefActivity(final Preference preference) {
-        final Context context = preference.getContext();
-        if (context instanceof ContextThemeWrapper) {
-            if (context instanceof SettingsActivity) {
-                return ((SettingsActivity) context);
-            }
-        }
-        return null;
-    }
-}
diff --git a/ui/src/main/java/com/wireguard/android/util/FragmentUtils.kt b/ui/src/main/java/com/wireguard/android/util/FragmentUtils.kt
new file mode 100644
index 00000000..90e7ab0c
--- /dev/null
+++ b/ui/src/main/java/com/wireguard/android/util/FragmentUtils.kt
@@ -0,0 +1,21 @@
+/*
+ * Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package com.wireguard.android.util
+
+import android.view.ContextThemeWrapper
+import androidx.preference.Preference
+import com.wireguard.android.activity.SettingsActivity
+
+object FragmentUtils {
+    fun getPrefActivity(preference: Preference): SettingsActivity {
+        val context = preference.context
+        if (context is ContextThemeWrapper) {
+            if (context is SettingsActivity) {
+                return context
+            }
+        }
+        throw IllegalStateException("Failed to resolve SettingsActivity")
+    }
+}