Insert temporary warning update message during message request state.

app/src/main/java/org/thoughtcrime/securesms/database/model/InMemoryMessageRecord.java

@@ -0,0 +1,111 @@
+package org.thoughtcrime.securesms.database.model;
+
+import android.content.Context;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
+
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.recipients.Recipient;
+
+import java.util.Collections;
+
+/**
+ * In memory message record for use in temporary conversation messages.
+ */
+public class InMemoryMessageRecord extends MessageRecord {
+
+  private InMemoryMessageRecord(long id,
+                                String body,
+                                Recipient conversationRecipient,
+                                long threadId,
+                                long type)
+  {
+    super(id,
+          body,
+          conversationRecipient,
+          conversationRecipient,
+          1,
+          System.currentTimeMillis(),
+          System.currentTimeMillis(),
+          System.currentTimeMillis(),
+          threadId,
+          0,
+          0,
+          type,
+          Collections.emptyList(),
+          Collections.emptyList(),
+          -1,
+          0,
+          System.currentTimeMillis(),
+          0,
+          false,
+          Collections.emptyList(),
+          false,
+          0,
+          0);
+  }
+
+  @Override
+  public boolean isMms() {
+    return false;
+  }
+
+  @Override
+  public boolean isMmsNotification() {
+    return false;
+  }
+
+  @Override
+  public boolean isInMemoryMessageRecord() {
+    return true;
+  }
+
+  public boolean showActionButton() {
+    return false;
+  }
+
+  public @StringRes int getActionButtonText() {
+    return 0;
+  }
+
+  /**
+   * Warning message to show during message request state if you do not have groups in common
+   * with an individual or do not know anyone in the group.
+   */
+  public static final class NoGroupsInCommon extends InMemoryMessageRecord {
+    private final boolean isGroup;
+
+    public NoGroupsInCommon(long threadId, boolean isGroup) {
+      super(-1, "", Recipient.UNKNOWN, threadId, 0);
+      this.isGroup = isGroup;
+    }
+
+    @Override
+    public @Nullable UpdateDescription getUpdateDisplayBody(@NonNull Context context) {
+      return UpdateDescription.staticDescription(context.getString(isGroup ? R.string.ConversationUpdateItem_no_contacts_in_this_group_review_requests_carefully
+                                                                           : R.string.ConversationUpdateItem_no_groups_in_common_review_requests_carefully),
+                                                 R.drawable.ic_update_info_16);
+    }
+
+    @Override
+    public boolean isUpdate() {
+      return true;
+    }
+
+    @Override
+    public boolean showActionButton() {
+      return true;
+    }
+
+    public boolean isGroup() {
+      return isGroup;
+    }
+
+    @Override
+    public @StringRes int getActionButtonText() {
+      return R.string.ConversationUpdateItem_learn_more;
+    }
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/database/model/MessageRecord.java

@@ -489,6 +489,10 @@ public abstract class MessageRecord extends DisplayRecord {
     return MmsSmsColumns.Types.isFailedDecryptType(type);
   }
 
+  public boolean isInMemoryMessageRecord() {
+    return false;
+  }
+
   protected static SpannableString emphasisAdded(String sequence) {
     SpannableString spannable = new SpannableString(sequence);
     spannable.setSpan(new RelativeSizeSpan(0.9f), 0, sequence.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);