com.github.quintans.ezSQL.transformers

Interface QueryMapper

All Known Implementing Classes:

MapBeanTransformer

public interface QueryMapper

Method Summary

Modifier and Type	Method and Description
void	apply(Object instance, String name, Object value)
Object	createFrom(Object parentInstance, String name) Method called to get domain instance (POJO) when calling the property() method.
boolean	map(ResultSetWrapper rsw, Object instance, List<MapColumn> mapColumns) collecting the data from the database and put in the domain instance.

Method Detail

createFrom

Object createFrom(Object parentInstance,
                  String name)

Method called to get domain instance (POJO) when calling the property() method. This method is only called when there is a need to create a new instance. If the parent instance is null, it means we are asking for the root object to be instantiated. Otherwise we are asking an instance of the type defined by the property defined in 'name' in the parent instance. Override this method to provide your own implementation for a different domain object. We defer the setting of the instance, by returning a lambda, because we may wish not to set the value. e.g: in an outer join, all related fields came as null, therefore it is a empty entity

Parameters:

parentInstance - parent instance

name - name of the parent property that we want to instantiate for

Returns:

lambda where we apply the the instance value to the parent instance

apply

void apply(Object instance,
           String name,
           Object value)

map

boolean map(ResultSetWrapper rsw,
            Object instance,
            List<MapColumn> mapColumns)

collecting the data from the database and put in the domain instance. The value from a column is always put in an domain instance.

Parameters:

rsw - resultset wrapper

instance - domain instance to return

mapColumns - column mapping info

Returns:

true if the instance was populated with data