DO NOT REPLY [Bug 32380] - [beanutils] Indexed property inside a mapped property cannot be accessed

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http://issues.apache.org/bugzilla/show_bug.cgi?id=32380





------- Additional Comments From tettoni@iso.org  2005-05-20 14:20 -------
(In reply to comment #0)
Hi, I think the expression parser may be in cause. I feel a fix should go there.

Indeed, for JavaBean's simple properties (as well as for java.util.Map), the 
period '.' denotes the operator to dereference from one parent object's 
property to it's child object value.

Likewise, for indexed properties (as well as for java.util.List), the "[i]" 
syntax represent the derefenrencing of that element (the identifier is a 
number, not a name).

Therefore, getProperty(MYLIST, "5") should work, in analogy with getProperty
(MYMAP, "key"). It does not. In any case, the processing of "." or "[]" is left 
to the parser. 

Solving this would allow Maps of Lists, Lists of Lists, etc. I do not yet see a 
limitation, but I don't have enough knowledge of BeanUtils :-)

> Hi, guys.
> Suppose I have a Map, let's call it "building", inside that map I have an 
entry
> with key "rooms", which is a Collection. If I try to access room number 20 
like
> this:
> "building.rooms[20].type" it doesn't work (throws IllegalArgumentException).
> I made a custom implementation of "building" Map so that I can see what param 
is
> passed to the get() method. Surprisingly I see, that
> PropertyUtilsBean.getInstance().getProperty(bean, name) calls get() method on 
my
> Map with parameter "rooms[20]" (including index part). 
> This is definitely a bug, because getProperty() should recognize, that "rooms"
> is an indexed property (because it has []), so it should cut off "[20]", call
> get("rooms") and then obtain element with index 20 from the retrieved 
Collection.
> Please have a look.



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