@CheckResult @NonNull
  public final <T> Observable<T> mapToOneOrDefault(@NonNull Function<Cursor, T> mapper,
      @NonNull T defaultValue) {
    """
	Given a function mapping the current row of a {@link Cursor} to {@code T}, transform each
	emitted {@link Query} which returns a single row to {@code T}.
	<p>
	It is an error for a query to pass through this operator with more than 1 row in its result
	set. Use {@code LIMIT 1} on the underlying SQL query to prevent this. Result sets with 0 rows
	emit {@code defaultValue}.
	<p>
	This method is equivalent to:
	<pre>{@code
	flatMap(q -> q.asRows(mapper).take(1).defaultIfEmpty(defaultValue))
	}</pre>
	and a convenience operator for:
	<pre>{@code
	lift(Query.mapToOneOrDefault(mapper, defaultValue))
	}</pre>
	
	@param mapper Maps the current {@link Cursor} row to {@code T}. May not return null.
	@param defaultValue Value returned if result set is empty
    """
    return lift(Query.mapToOneOrDefault(mapper, defaultValue));
  }
@CheckResult @NonNull
  public final <T> Observable<T> mapToOneOrDefault(@NonNull Function<Cursor, T> mapper,
      @NonNull T defaultValue) {
    return lift(Query.mapToOneOrDefault(mapper, defaultValue));
  }
@ CheckResult @ NonNull public final < T > Observable < T > mapToOneOrDefault ( @ NonNull Function < Cursor , T > mapper , @ NonNull T defaultValue ) { return lift ( Query . mapToOneOrDefault ( mapper , defaultValue ) ) ; }
Given a function mapping the current row of a {@link Cursor} to {@code T}, transform each
emitted {@link Query} which returns a single row to {@code T}.
<p>
It is an error for a query to pass through this operator with more than 1 row in its result
set. Use {@code LIMIT 1} on the underlying SQL query to prevent this. Result sets with 0 rows
emit {@code defaultValue}.
<p>
This method is equivalent to:
<pre>{@code
flatMap(q -> q.asRows(mapper).take(1).defaultIfEmpty(defaultValue))
}</pre>
and a convenience operator for:
<pre>{@code
lift(Query.mapToOneOrDefault(mapper, defaultValue))
}</pre>

@param mapper Maps the current {@link Cursor} row to {@code T}. May not return null.
@param defaultValue Value returned if result set is empty
Given a function mapping the current row of a { @link Cursor } to { @code T } transform each emitted { @link Query } which returns a single row to { @code T } . <p > It is an error for a query to pass through this operator with more than 1 row in its result set . Use { @code LIMIT 1 } on the underlying SQL query to prevent this . Result sets with 0 rows emit { @code defaultValue } . <p > This method is equivalent to : <pre > { @code flatMap ( q - > q . asRows ( mapper ) . take ( 1 ) . defaultIfEmpty ( defaultValue )) } < / pre > and a convenience operator for : <pre > { @code lift ( Query . mapToOneOrDefault ( mapper defaultValue )) } < / pre >