private com.google.protobuf.SingleFieldBuilderV3<
            com.google.webrisk.v1.ComputeThreatListDiffRequest.Constraints,
            com.google.webrisk.v1.ComputeThreatListDiffRequest.Constraints.Builder,
            com.google.webrisk.v1.ComputeThreatListDiffRequest.ConstraintsOrBuilder>
        getConstraintsFieldBuilder() {
      if (constraintsBuilder_ == null) {
        constraintsBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.webrisk.v1.ComputeThreatListDiffRequest.Constraints,
                com.google.webrisk.v1.ComputeThreatListDiffRequest.Constraints.Builder,
                com.google.webrisk.v1.ComputeThreatListDiffRequest.ConstraintsOrBuilder>(
                getConstraints(), getParentForChildren(), isClean());
        constraints_ = null;
      }
      return constraintsBuilder_;
    }
<pre>
Required. The constraints associated with this request.
</pre>

<code>
.google.cloud.webrisk.v1.ComputeThreatListDiffRequest.Constraints constraints = 3 [(.google.api.field_behavior) = REQUIRED];
</code>
java-webrisk/proto-google-cloud-webrisk-v1/src/main/java/com/google/webrisk/v1/ComputeThreatListDiffRequest.java