toString method
A string representation of this object.
Some classes have a default textual representation,
often paired with a static parse function (like int.parse).
These classes will provide the textual representation as
their string representation.
Other classes have no meaningful textual representation
that a program will care about.
Such classes will typically override toString to provide
useful information when inspecting the object,
mainly for debugging or logging.
Implementation
@override
String toString() {
final StringBuffer buffer = StringBuffer('$kind: $message');
if (disk != null) buffer.write(' (disk: $disk)');
if (path != null) buffer.write(' (path: $path)');
if (cause != null) buffer.write('\n$cause');
return buffer.toString();
}