ognl

Interface NullHandler

All Known Implementing Classes:

ObjectNullHandler

public interface NullHandler

Interface for handling null results from Chains. Object has the opportunity to substitute an object for the null and continue.

Author:

Luke Blanshard (blanshlu@netscape.net), Drew Davidson (drew@ognl.org)

Method Summary

Methods

Modifier and Type	Method and Description
Object	nullMethodResult(Map context, Object target, String methodName, Object[] args) Method called on target returned null.
Object	nullPropertyValue(Map context, Object target, Object property) Property in target evaluated to null.

Method Detail

nullMethodResult

Object nullMethodResult(Map context,
                      Object target,
                      String methodName,
                      Object[] args)

Method called on target returned null.

Parameters:

context - the current execution context.

target - the Object on which the method was called.

methodName - the name of the method which was called.

args - the arguments to the method that was called.

Returns:

the result Object containing the state of the method call that returned null.

nullPropertyValue

Object nullPropertyValue(Map context,
                       Object target,
                       Object property)

Property in target evaluated to null. Property can be a constant String property name or a DynamicSubscript.

Parameters:

context - the current execution context.

target - the Object to which the property belongs.

property - the property whose value evaluated to null.

Returns:

the result Object containing the state of the property that evaluated to null.