public GetReferenceRequest withFile(String file) {
        setFile(file);
        return this;
    }
<p>
The file to retrieve.
</p>

@param file
       The file to retrieve.
@return Returns a reference to this object so that method calls can be chained together.
@see ReferenceFile
aws-java-sdk-omics/src/main/java/com/amazonaws/services/omics/model/GetReferenceRequest.java