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Eclipse 3.5 property databinding with nested property names [message #483578]

Wed, 02 September 2009 08:00

Reto Urfer

Messages: 8
Registered: July 2009

Junior Member

Hi

Eclipse 3.5 does supports nested property names "a.b.c" for value
databinding but unfortunately for list, set and map databinding only simple
porperty names "a" are supported.

Is there any reason why nested property names are not supported for list,
set and map?

I implemented a corresponding extension for list and it seems to work
properly (see attached list_method.java). The same extension could easily be
implemented for set and map properties. If property name is "a.b.c", "a" and
"b" are value properties and only "c" is the list, set or map property.

Thanks

Reto

Attachment: list_method.java
(Size: 1.41KB, Downloaded 249 times)

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Re: Eclipse 3.5 property databinding with nested property names [message #483668 is a reply to message #483578]

Wed, 02 September 2009 14:04

Matthew Hall

Messages: 368
Registered: July 2009

Senior Member

Reto Urfer wrote:
> Eclipse 3.5 does supports nested property names "a.b.c" for value
> databinding but unfortunately for list, set and map databinding only simple
> porperty names "a" are supported.
>
> Is there any reason why nested property names are not supported for list,
> set and map?

They are supported, but I did not support them as dot-delimited strings
because there is no standard syntax for specifying a list property. If
we accepted code like:

IListProperty siblingNamesProp =
BeanProperties.list("parent.children.name")

Then BeanProperties would basically have to guess which of the three
nested properties is the list property. Rather than do this you use
three method calls to make it explicit:

IListProperty siblineNamesProp =
BeanProperties.value("parent").list("children").values("name ");

which accomplishes the same thing. The same pattern may be applied to
get nested set or map properties.

Matthew

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