feat(fcm): Add FcmOptions on MulticastMessage

src/main/java/com/google/firebase/messaging/MulticastMessage.java

@@ -51,6 +51,7 @@ public class MulticastMessage {
   private final AndroidConfig androidConfig;
   private final WebpushConfig webpushConfig;
   private final ApnsConfig apnsConfig;
+  private final FcmOptions fcmOptions;
 
   private MulticastMessage(Builder builder) {
     this.tokens = builder.tokens.build();
@@ -64,14 +65,16 @@ private MulticastMessage(Builder builder) {
     this.androidConfig = builder.androidConfig;
     this.webpushConfig = builder.webpushConfig;
     this.apnsConfig = builder.apnsConfig;
+    this.fcmOptions = builder.fcmOptions;
   }
 
   List<Message> getMessageList() {
     Message.Builder builder = Message.builder()
         .setNotification(this.notification)
         .setAndroidConfig(this.androidConfig)
         .setApnsConfig(this.apnsConfig)
-        .setWebpushConfig(this.webpushConfig);
+        .setWebpushConfig(this.webpushConfig)
+        .setFcmOptions(this.fcmOptions);
     if (this.data != null) {
       builder.putAllData(this.data);
     }
@@ -99,6 +102,7 @@ public static class Builder {
     private AndroidConfig androidConfig;
     private WebpushConfig webpushConfig;
     private ApnsConfig apnsConfig;
+    private FcmOptions fcmOptions;
 
     private Builder() {}
 
@@ -170,6 +174,15 @@ public Builder setApnsConfig(ApnsConfig apnsConfig) {
       return this;
     }
 
+    /**
+     * Sets the {@link FcmOptions}, which can be overridden by the platform-specific {@code
+     * fcm_options} fields.
+     */
+    public Builder setFcmOptions(FcmOptions fcmOptions) {
+      this.fcmOptions = fcmOptions;
+      return this;
+    }
+
     /**
      * Adds the given key-value pair to the message as a data field. Key or the value may not be
      * null.

src/test/java/com/google/firebase/messaging/MulticastMessageTest.java

@@ -39,6 +39,7 @@ public class MulticastMessageTest {
       .putData("key", "value")
       .build();
   private static final Notification NOTIFICATION = new Notification("title", "body");
+  private static final FcmOptions FCM_OPTIONS = FcmOptions.withAnalyticsLabel("analytics_label");
 
   @Test
   public void testMulticastMessage() {
@@ -47,6 +48,7 @@ public void testMulticastMessage() {
         .setApnsConfig(APNS)
         .setWebpushConfig(WEBPUSH)
         .setNotification(NOTIFICATION)
+        .setFcmOptions(FCM_OPTIONS)
         .putData("key1", "value1")
         .putAllData(ImmutableMap.of("key2", "value2"))
         .addToken("token1")
@@ -96,7 +98,8 @@ private void assertMessage(Message message, String expectedToken) {
     assertSame(APNS, message.getApnsConfig());
     assertSame(WEBPUSH, message.getWebpushConfig());
     assertSame(NOTIFICATION, message.getNotification());
+    assertSame(FCM_OPTIONS, message.getFcmOptions());
     assertEquals(ImmutableMap.of("key1", "value1", "key2", "value2"), message.getData());
     assertEquals(expectedToken, message.getToken());
   }
-}
+}