DS::Source - component that is the source of rows
This class is the source of rows.
It can be bound to any DS::Target,
which will receive rows from it.
Unless you are into writing complicated classes,
you will probably never need to inherit directly from this class.
If you need to write a class that retrieves data from outside a chain and passes it on as rows,
please take a look at DS::Importer.
None.
Constructor.
Instantiates an object of class $class,
returning the type $out_type,
attaced to the target $target.
Besides $class,
any of the parameters can be left out.
Attaches target $target to this object.
This method also triggers type checking,
ensuring that the outgoing type of this object is sufficient for $target.
If the type check fails,
an exception is thrown.
This is a method mostly for internal use. It will get or set the target, bypassing type checks.
Calling this metod will cause the transformer to pass $row to the target $target.
This is an accessor that gets or sets the outgoing type of this object.
DS::Importer, DS::Transformer, DS::Target.
Written by Michael Zedeler.
