From a2de8a2a055440c036b3e9ead03cb01404f1894d Mon Sep 17 00:00:00 2001
From: Greyson Parrelli <greyson@signal.org>
Date: Thu, 30 Apr 2020 12:52:04 -0400
Subject: [PATCH] Ensure you can't set null values in DefaultValueLiveData.

---
 .../securesms/util/DefaultValueLiveData.java       | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/app/src/main/java/org/thoughtcrime/securesms/util/DefaultValueLiveData.java b/app/src/main/java/org/thoughtcrime/securesms/util/DefaultValueLiveData.java
index 2fe907f0ff..7c91e19223 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/util/DefaultValueLiveData.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/util/DefaultValueLiveData.java
@@ -3,6 +3,8 @@ package org.thoughtcrime.securesms.util;
 import androidx.annotation.NonNull;
 import androidx.lifecycle.MutableLiveData;
 
+import org.whispersystems.libsignal.util.guava.Preconditions;
+
 /**
  * Helps prevent all the @Nullable warnings when working with LiveData.
  */
@@ -15,6 +17,18 @@ public class DefaultValueLiveData<T> extends MutableLiveData<T> {
     this.defaultValue = defaultValue;
   }
 
+  @Override
+  public void postValue(@NonNull T value) {
+    Preconditions.checkNotNull(value);
+    super.postValue(value);
+  }
+
+  @Override
+  public void setValue(@NonNull T value) {
+    Preconditions.checkNotNull(value);
+    super.setValue(value);
+  }
+
   @Override
   public @NonNull T getValue() {
     T value = super.getValue();