Package org.apache.commons.dbutils.handlers

Class AbstractKeyedHandler<K,V>

java.lang.Object

org.apache.commons.dbutils.handlers.AbstractKeyedHandler<K,V>

Type Parameters:

K - the type of keys maintained by the returned map

V - the type of mapped values

All Implemented Interfaces:

ResultSetHandler<Map<K,V>>

Direct Known Subclasses:

BeanMapHandler, KeyedHandler

public abstract class AbstractKeyedHandler<K,V>
extends Object
implements ResultSetHandler<Map<K,V>>

ResultSetHandler implementation that returns a Map. ResultSet rows are converted into objects (Vs) which are then stored in a Map under the given keys (Ks).

Since:

1.3

See Also:

ResultSetHandler

Constructor Summary

Constructors

Constructor	Description
AbstractKeyedHandler()

Method Summary

Modifier and Type	Method	Description
protected abstract K	createKey(ResultSet resultSet)	This factory method is called by handle() to retrieve the key value from the current ResultSet row.
protected Map<K,V>	createMap()	This factory method is called by handle() to create the Map to store records in.
protected abstract V	createRow(ResultSet resultSet)	This factory method is called by handle() to store the current ResultSet row in some object.
Map<K,V>	handle(ResultSet resultSet)	Convert each row's columns into a Map and store then in a Map under ResultSet.getObject(key) key.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractKeyedHandler

public AbstractKeyedHandler()

Method Detail

createKey

protected abstract K createKey(ResultSet resultSet)
                        throws SQLException

This factory method is called by handle() to retrieve the key value from the current ResultSet row.

Parameters:

resultSet - ResultSet to create a key from

Returns:

K from the configured key column name/index

Throws:

SQLException - if a database access error occurs

createMap

protected Map<K,V> createMap()

This factory method is called by handle() to create the Map to store records in. This implementation returns a HashMap instance.

Returns:

Map to store records in

createRow

protected abstract V createRow(ResultSet resultSet)
                        throws SQLException

This factory method is called by handle() to store the current ResultSet row in some object.

Parameters:

resultSet - ResultSet to create a row from

Returns:

V object created from the current row

Throws:

SQLException - if a database access error occurs

handle

public Map<K,V> handle(ResultSet resultSet)
                      throws SQLException

Convert each row's columns into a Map and store then in a Map under ResultSet.getObject(key) key.

Specified by:

handle in interface ResultSetHandler<K>

Parameters:

resultSet - ResultSet to process.

Returns:

A Map, never null.

Throws:

SQLException - if a database access error occurs

See Also:

ResultSetHandler.handle(java.sql.ResultSet)