Package org.jdbi.v3.core.mapper.reflect.internal

Class NullDelegatingMapper<T>

java.lang.Object
org.jdbi.v3.core.mapper.reflect.internal.NullDelegatingMapper<T>
Type Parameters:
T -
All Implemented Interfaces:
RowMapper<T>
public final class NullDelegatingMapper<T> extends Object implements RowMapper<T>
Delegating mapper that implements the @PropagateNull semantics to check a specific column in the result set for null first. If that column is null, return null as the value, otherwise executed the delegated mapper.

  • Field Details

    • index

      private final int index

    • delegate

      private final RowMapper<T> delegate

  • Constructor Details

    • NullDelegatingMapper

      public NullDelegatingMapper(int index, RowMapper<T> delegate)

  • Method Details

    • init

      public void init(ConfigRegistry registry)
      Description copied from interface: RowMapper
      Allows for initialization of the row mapper instance within a ConfigRegistry scope. This method is called once when the row mapper is first used from a ConfigRegistry.

      Note that handles, statements, sql objects etc. all create copies of the registry, and this method will be called for every copy

      Specified by:
      init in interface RowMapper<T>
      Parameters:
      registry - A reference to the ConfigRegistry that this instance belongs to.

    • map

      public T map(ResultSet rs, StatementContext ctx) throws SQLException
      Description copied from interface: RowMapper
      Map the current row of the result set. This method should not cause the result set to advance; allow Jdbi to do that, please.
      Specified by:
      map in interface RowMapper<T>
      Parameters:
      rs - the result set being iterated
      ctx - the statement context
      Returns:
      the value to produce for this row
      Throws:
      SQLException - if anything goes wrong go ahead and let this percolate; Jdbi will handle it

    • specialize

      public RowMapper<T> specialize(ResultSet rs, StatementContext ctx) throws SQLException
      Description copied from interface: RowMapper
      Returns a specialized row mapper, optimized for the given result set.

      Before mapping the result set from a SQL statement; Jdbi will first call this method to obtain a specialized instance. The returned mapper will then be used to map the result set rows, and discarded.

      Implementing this method is optional; the default implementation returns this. Implementors might choose to override this method to improve performance, e.g. by matching up column names to properties once for the entire result set, rather than repeating the process for every row.

      Specified by:
      specialize in interface RowMapper<T>
      Parameters:
      rs - the result set to specialize over
      ctx - the statement context to specialize over
      Returns:
      a row mapper equivalent to this one, possibly specialized.
      Throws:
      SQLException - if anything goes wrong go ahead and let this percolate; Jdbi will handle it
      See Also:

    • toString

      public String toString()
      Overrides:
      toString in class Object