Here is the scenario:
From SOLR I'm getting results that are restyled with XSLT so that it is
compliant with Pivots Hashmap/Dictionary schemas. This gets bound with the
serializer on every query (very fast, BTW).
In one part of the GUI, I have a treeview that shows facets based on the
search results. On each leaf node I have an enhanced treenode (I called it
UDTreeNode, for "UserDictionaryCapableTreeNode". As someone is
selecting/unselecting values from the tree to filter results based on facet
items, I'm capturing the node userdata into a UserDataDictionary on the
Treeview object. So as someone is refining their search results, I'm
adding/removing from that dictionary on Treeview based on node events and
the userdata on each node. But when the person wants to start a NEW search
without any facet filtering applied, I need a way to clear all selections
from the TreeView dictionary.(This is the point where I'm looking for a more
elegant method, like clear() to clear all element from a Map, etc). What if
you had a method to set Treeview.UserDataDictionary to null or a "new/empty
Component.UserDataDictionary"? Is there a problem with seting it to a
new/empty dictionary? Something to do with events, etc.?
BTW, it would also be neat if you can have a basic "checked" or "selected"
attribute on treenodes, so when I'm binding xml to the treeview, the
appropriate nodes are checked and the "selectedpaths" on treeview would be
updated. Otherwise, I think I'd have to save the last "selected paths" and
reapply them after setting treedata with xml from SOLR. Only issue with
this idea is that selected paths are position-based, not element-id
based/wtkx-id-based, etc. So if the xml from SOLR is modified, right now it
would be difficult to apply the last "selectedpaths" to the new treedata. I
think i can hack something together for this. I need to look at the
treeview.setdata() method and see if I can update the selected-paths based
on treenode attributes or my new treenode userdatadictionary.
Kudos to you guys for making this framework. My manager at work is excited
about this (which is actually a surprise, because the the IT-shop is
primarily Microsoft shop). So SOLR (java) and Pivot (java) in that shop
might change peoples' perceptions of Java. I was trying GWT/SmartGWT a few
weeks ago but ran into roadblocks with their databinding conventions. Pivot
lets me take a XML document, break it up and bind to individual
treeview/tableview components in one HTTP GET.
One more thing, in the old Thinlet, you could always grab a handle to an
object by it's ID (every element in their xml had an ID attribute) as long
as you provided an ID attribute. It was something like
"desktop.getByID(my_item_id)". With this you were able to provide the scope
of the seach with another argument, just in case you were using duplicate
IDs in across larger components.
With Pivot, you have to explicity set a variable when the serializer is
running. Is there a big cost to storing a map of all IDs ? Just an idea.
I can send you screenshots of the prototype if you'd like (after the
weekend).
Thanks again.
Bob
----- Original Message -----
From: "Greg Brown" <[email protected]>
To: <[email protected]>
Sent: Saturday, February 13, 2010 8:39 AM
Subject: Re: clearing all items from Component.UserDataDictionary
Just curious - what is the use case that is driving this? Our assumption
when implementing UserDataDictionary was that bulk removes of user data
would not be a common requirement, so it would help to understand the
motivation. There may be another way to accomplish what you are trying to
do...
On Feb 12, 2010, at 4:24 PM, Robert Piotrowski wrote:
I there a quick way to remove all items in Component.UserDataDictionary
in one step?
If I iterate with the iterator and use remove(), I get a concurrency
exception.
My workaround right now is by interating over the dictionary to get all
keys into a vector and then looping thru the vector to remove elements by
keyname back on the dictionary. But it's nasty.
Maybe it should implement the Map interface too/instead?
Or is there a way to set it to an empty dictionary? I can't see to get
that to work.
Thanks,
Bob
