Check localIdentity is null before setting it.

rmehta19 · rmehta19 · commit 7f267121aa66 · 2024-09-12T09:49:26.000-07:00
diff --git a/s2a/src/main/java/io/grpc/s2a/S2AChannelCredentials.java b/s2a/src/main/java/io/grpc/s2a/S2AChannelCredentials.java
@@ -73,6 +73,7 @@ public static final class Builder {
     @CanIgnoreReturnValue
     public Builder setLocalSpiffeId(String localSpiffeId) {
       checkNotNull(localSpiffeId);
+      checkArgument(localIdentity == null, "localIdentity is already set.");
       localIdentity = S2AIdentity.fromSpiffeId(localSpiffeId);
       return this;
     }
@@ -85,6 +86,7 @@ public Builder setLocalSpiffeId(String localSpiffeId) {
     @CanIgnoreReturnValue
     public Builder setLocalHostname(String localHostname) {
       checkNotNull(localHostname);
+      checkArgument(localIdentity == null, "localIdentity is already set.");
       localIdentity = S2AIdentity.fromHostname(localHostname);
       return this;
     }
@@ -97,6 +99,7 @@ public Builder setLocalHostname(String localHostname) {
     @CanIgnoreReturnValue
     public Builder setLocalUid(String localUid) {
       checkNotNull(localUid);
+      checkArgument(localIdentity == null, "localIdentity is already set.");
       localIdentity = S2AIdentity.fromUid(localUid);
       return this;
     }
