@In(create=true)

creates the component for you.

No, it's not equivalent.

private MyDto dto = (MyDto)Component.getInstance(MyDto.class);

creates a component if it doesn't exist in the scope

@In(required=false)
private MyDto dto;

this just performs a dependency injection

James S. wrote on Mar 26, 2010 16:08:


Hi,

I have an injected property which has a required attribute false.

@In(required=false)
private MyDto dto;

I would like to convert above to like this:

private MyDto dto = (MyDto)Component.getInstance(MyDto.class);

How can I set a required attribute programatically?

Thank you for your help!

You can't actually set the required attribute programmatically. However, you should get the same behavior by doing this:

private MyDto dto = (MyDto)Component.getInstance(MyDto.class, false);

What this means is: Inject an instance of MyDto.class if and only if one exits in my current context(s). Doing this is basically the same as setting required=false. The boolean represents the decision to create an instance if one does not exist.