Creating a bar chart from the input data

This scenario describes a Job that reads source data from a CSV file and transforms the data into a bar chart showing a comparison of several large cities. The input file is shown below:

For more technologies supported by Talend, see Talend components.

City;Population(x1000);LandArea(km2);PopulationDensity(people/km2)
Beijing;10233;1418;7620
Moscow;10452;1081;9644
Seoul;10422;605;17215
Tokyo;8731;617;14151
Jakarta;8490;664;12738
New York;8310;789;10452

Because the input file has a different structure than the one required by the tBarChart component, this use case uses the tMap component to adapt the source data to the three-column schema of tBarChart so that a temporary CSV file can be created as the input to the tBarChart component.

To ensure correct generation of the temporary input file, a pre-treatment subJob is used to delete the temporary file in case it already exists before the main Job is executed; as this temporary file serves this specific Job only, a post-treatment subJob is used to deleted it after the main Job is executed.