org.apache.commons.betwixt.expression
Class TypedUpdater

java.lang.Object
  org.apache.commons.betwixt.expression.TypedUpdater

All Implemented Interfaces:

Updater

Direct Known Subclasses:

DynaBeanUpdater, MethodUpdater

public abstract class TypedUpdater
extends java.lang.Object
implements Updater

Abstracts common features for strongly typed Updater's. Strongly type Updater's perform conversions based on this the expected type before the bean update is invoked.

Since:

0.7

Author:

Apache Commons Team, Apache Software Foundation

Constructor Summary

TypedUpdater()

Method Summary

protected abstract void	executeUpdate(Context context, java.lang.Object bean, java.lang.Object value) Updates the bean with the given value.
java.lang.Class	getValueType() Gets the type expected.
protected void	handleException(Context context, java.lang.Exception e) Strategy method to allow derivations to handle exceptions differently.
void	setValueType(java.lang.Class valueType) Sets the type expected.
void	update(Context context, java.lang.Object newValue) Updates the current bean context with the given String value

Methods inherited from class java.lang.Object

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

Constructor Detail

TypedUpdater

public TypedUpdater()

Method Detail

update

public void update(Context context,
                   java.lang.Object newValue)

Updates the current bean context with the given String value

Specified by:

update in interface Updater

Parameters:

context - the Context to be updated

newValue - the update to this new value

getValueType

public java.lang.Class getValueType()

Gets the type expected. The value passed into update(org.apache.commons.betwixt.expression.Context, java.lang.Object) will be converted on the basis of this type before being passed to executeUpdate(org.apache.commons.betwixt.expression.Context, java.lang.Object, java.lang.Object).

Returns:

Class giving expected type, not null

setValueType

public void setValueType(java.lang.Class valueType)

Sets the type expected. The value passed into update(org.apache.commons.betwixt.expression.Context, java.lang.Object) will be converted on the basis of this type before being passed to executeUpdate(org.apache.commons.betwixt.expression.Context, java.lang.Object, java.lang.Object).

Parameters:

valueType - Class giving expected type, not null

executeUpdate

protected abstract void executeUpdate(Context context,
                                      java.lang.Object bean,
                                      java.lang.Object value)
                               throws java.lang.Exception

Updates the bean with the given value.

Parameters:

bean -

value - value after type conversion

Throws:

java.lang.Exception

handleException

protected void handleException(Context context,
                               java.lang.Exception e)

Strategy method to allow derivations to handle exceptions differently.

Parameters:

context - the Context being updated when this exception occured

e - the Exception that occured during the update