Readers

Readers can read data from input files (both local and remote), receive it from the connected optional input port, read it from a dictionary, from a database, or from a JMS.
One component only generates data. Since it is also an initial node, we will describe it here.
We can distinguish Readers according to what they can read:

Generating data

A DataGenerator component generates data.

Reading flat files

FlatFileReader reads data from flat files (delimited or fixed length).
ComplexDataReader reads data from flat files whose structure is heterogeneous or mutually dependent and it uses a GUI to achieve that.
MultiLevelReader reads data from flat files with a heterogeneous structure.

Reading XML files

XMLExtract reads data from XML files using SAX technology.
XMLReader reads data from XML files using DOM technology.
XMLXPathReader reads data from XML files using XPath queries.

Generally, use XMLExtract. If you require a more complex XPath queries, use XMLReader.

Reading JSON files

JSONExtract reads data from JSON files. Based on SAX.
JSONReader reads data from JSON files using XPath queries. Based on DOM.

Reading other files

SpreadsheetDataReader reads data from XLS or XLSX files.

Reading databases

DatabaseReader unloads data from database using a JDBC driver.

Reading other resources

Directory structure:
- LDAPReader converts directory structure into data records.