@Override
    public String toString() {

        return "SingleInputStream{" +
                "isFaultStream=" + isFaultStream +
                ", isInnerStream=" + isInnerStream +
                ", id='" + streamId + '\'' +
                ", streamReferenceId='" + streamReferenceId + '\'' +
                ", streamHandlers=" + streamHandlers +
                ", windowPosition=" + windowPosition +
                '}';
    }
Single input stream using only filters and functions
modules/siddhi-query-api/src/main/java/io/siddhi/query/api/execution/query/input/stream/SingleInputStream.java