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All configuration information of a Transformation Step is stored as Step Options. The API provides methods for saving and retrieving step options, which are stored as key-value pairs in a Map. User input may be directly saved as an option value, or inputs may be encoded as options. It is up to the step to set them up and consume them.
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Wires
One can resolve how an input field is linked to an output (via a default metadata field) using FieldUUID and linkFieldUUID. However, it is not always convenient to do this as it involves iterating over the fields. The Wire class provides an easy way to map these fields together. It may then be used to retrieve/send data. The API sets up the wires and a widget developer can use them to manipulate data without worrying about the order of fields in the default/output metadata collection.
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