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From Adrian Mitev <>
Subject Re: [JXPath] Questions about pointers, listeners & filters
Date Mon, 27 Apr 2009 20:36:32 GMT
Why don't you share us the solutions?

On Mon, Apr 27, 2009 at 4:50 PM, Andrew Hughes <> wrote:
> I think I have a solution for both based on JXPath.
> Cheers && a HUGE thank's to JXPath && Matt.
> On Fri, Apr 24, 2009 at 12:09 PM, Andrew Hughes <> wrote:
>> Hi All - probably just Matt tho   :)
>> I've had some great results with JXPath, and I am now getting down to the
>> nitty/gritty of what I am trying to achieve. Which is quite complex and I've
>> no doubt that more experienced people than me exist in this area! Help is
>> once again greatly appreciated!!!
>> Background: I am dealing with dynamic objects (Nodes). Node's
>> appear/disappear at runtime and are encapsulated in a heirarchy of HashMap's
>> for JXPath's context bean. This works fantastic, but I have two remaining
>> mandatory requirements.
>> Requirement 1: Listening
>> As a new node appears, listeners defined as expressions would like to know
>> about this. For example, someone would like to know if a Ferrari ever
>> appears in the context bean:  //Car[@name="Ferrari"]
>> or /Transport/Vehicle/Car[@name="Ferrari"]. I believe that I should be
>> testing is if the newly created/removed node/pointer is found in any of the
>> supplied listening expressions? Ideally this can be done by traversing the
>> minimal number of object's as possible - and could be too inefficient :'(
>> for use.
>> Requirement 2: Filtering.
>> As a new node appear's I would like to know if I should include this node
>> in the context bean hierarchy (i.e. addNewChild()) or ignore it. The
>> criteria is if the new node is found using an expression (include or
>> exclude). For example, if we don't deal with China then we might have an
>> exclude expression /World/Asia/China or /World/Asia/*. Can I determine if
>> the new node is within an includes/excludes expression without having to add
>> the node to the context, then testing, then removing - becuase this has the
>> potential to falsly invoke listeners in Requirement #1
>> I'd like to know if there is any helpful functionality within jxpath that I
>> am unaware of. I suspect there is
>> As usual... I'm incredibly thankful for any help I can get :)

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