com.sap.ipe.ble.irp.handler.services.DeepSelectionService Maven / Gradle / Ivy
package com.sap.ipe.ble.irp.handler.services;
import com.sap.cds.ql.CQL;
import com.sap.cds.ql.Predicate;
import com.sap.cds.ql.Select;
import com.sap.cds.ql.Selectable;
import com.sap.cds.ql.cqn.CqnSelect;
import com.sap.cds.reflect.CdsEntity;
import org.springframework.stereotype.Service;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/***
* DeepSelectionService is used to select the composition data
* Based on the annotation deepSelect is set to true or false
*/
@Service
public class DeepSelectionService{
/***
* This method is used to select the composition data
* @param contextParameters parameters needed for selection of data
* @param entity entity from which data needs to be selected
* @return query from which the data needs to be fetched
*/
public CqnSelect getDeepSelectData(Map contextParameters, CdsEntity entity) {
CqnSelect query;
List items = new ArrayList<>();
items.add(CQL.star());
items.addAll(entity.compositions().map(c -> CQL.to(c.getName()).expand()).collect(Collectors.toList()));
Select select = Select.from(entity).columns(items);
query = select.where(b -> {
Predicate predicate = null;
Stream keySet = contextParameters.keySet().stream();
for (Iterator iterator = keySet.iterator(); iterator.hasNext();) {
String parameterName = iterator.next();
Predicate data = b.get(parameterName).eq(contextParameters.get(parameterName));
predicate = predicate == null ? data : predicate.and(data);
}
return predicate;
});
return query;
}
}