final MapString MapString MapString BigDecimal levelSubtotalDict return levelSubtotalDictentrySetstream collectCollectorstoMap MapEntrygetKey entry - entrygetV

This code takes a nested map called levelSubtotalDict and transforms it into a new map with a different structure.

The input map levelSubtotalDict has the following structure:

Map<String, Map<String, Map<String, BigDecimal>>>

The output map has the following structure:

Map<String, Map<String, List<ComputeResultExportDTO>>>

The transformation is done using Java streams and the collect method. Here's how it works:

1. The entrySet() method is called on levelSubtotalDict to get a stream of key-value pairs from the outer map.
2. The collect method is used to collect the stream into a new map. The key remains the same, but the value is transformed using the following steps:
3. The entry.getValue() method is called to get the inner map for each outer key-value pair.
4. The entrySet() method is called on the inner map to get a stream of key-value pairs from the inner map.
5. The map method is used to transform each inner key-value pair into a new key-value pair. The key is the same as the inner key, and the value is a list of ComputeResultExportDTO objects.
6. Within the map method, the scoreMap.entrySet() method is called to get a stream of key-value pairs from the score map.
7. The map method is used to transform each score key-value pair into a new ComputeResultExportDTO object. The properties of this object are set based on the key-value pair and additional information from the empNameAndCode object.
8. The collect method is used to collect the stream of ComputeResultExportDTO objects into a list.
9. The resulting list of ComputeResultExportDTO objects is used as the value in the new key-value pair for the inner map.
10. The collect method is used to collect the stream of inner key-value pairs into a new map. The key remains the same, and the value is the list of ComputeResultExportDTO objects.
11. The resulting map is used as the value in the new key-value pair for the outer map.
12. Finally, the outer map is collected and returned