org.apache.tapestry5.plastic
Interface FieldConduit<T>

All Known Subinterfaces:

ParameterConduit

All Known Implementing Classes:

ReadOnlyComponentFieldConduit

public interface FieldConduit<T>

A FieldConduit is an object that effectively replaces the field in the instantiated object. All reads and writes of the field are replaced with invocations on the conduit. Once a field's access is replaced with a conduit, the field itself is no longer used. The conduit will even see initializations of the field.

In Aspect Oriented Programming terms, a FieldConduit allows you to advise read and write access to the field.

If a field has both a FieldConduit and a FieldHandle, then the methods of the FieldHandle will be connected to the methods of the FieldConduit.

Method Summary

T	get(Object instance, InstanceContext context) Invoked when the field is read.
void	set(Object instance, InstanceContext context, T newValue) Invoked when the field's value is updated.

Method Detail

get

T get(Object instance,
      InstanceContext context)

Invoked when the field is read.

Parameters:

instance - the instance containing the field

context - (see ClassInstantiator.with(Class, Object))

set

void set(Object instance,
         InstanceContext context,
         T newValue)

Invoked when the field's value is updated.

Parameters:

instance - the instance containing the field

context - (see ClassInstantiator.with(Class, Object))

newValue - value assigned to the field