- this.path = Preconditions.checkNotNull(path);
- this.listener = Preconditions.checkNotNull(listener);
- this.initialState = Preconditions.checkNotNull(initialState);
- this.onRegistration = Preconditions.checkNotNull(onRegistration);
+ this.path = requireNonNull(path);
+ this.listener = requireNonNull(listener);
+ this.initialState = requireNonNull(initialState);
+ this.onRegistration = requireNonNull(onRegistration);
+ }
+
+ @Override
+ public String toString() {
+ return "RegisterListener [path=" + path + ", listener=" + listener + ", initialState present="
+ + initialState.isPresent() + "]";