Re: [Vtd-xml-users] Random Access Proposal (take 2)

[Jimmy Z. <cra...@co...>]

I need to give that some thought...
----- Original Message ----- 
From: "Rodrigo Cunha" <rn...@gm...>
To: "Mark Swanson" <ma...@Sc...>
Cc: <vtd...@li...>
Sent: Wednesday, February 28, 2007 7:20 PM
Subject: Re: [Vtd-xml-users] Random Access Proposal (take 2)


> Nah... given what i understand about the internal structure making it
> the new document root is not trivial, i think.
>
> But you could get away with:
>
> - A bookmark/position saving system, aka the (in)famous SimpleContext
> class?...
>
> - A function evaluating:
>
> boolean SimpleContext.isSunOf(Simplecontext ctx); //this should be
> simple and efficient to implement
>
> Regards,
>
> Rodrigo
>
> Mark Swanson wrote:
>> Rodrigo Cunha wrote:
>>> For a SimpleContext, or something similar:
>>>
>>> The comparison operator could just compare the arrays containing the
>>> internal state of Navigator.
>>>
>>> The hashcode would be the XOR of all elements in the array, that
>>> implements java hashcode and equals in a compatible way with the
>>> assumed rules in java libraries.
>>>
>>> Jimmy, I think my "SimpleContext" or whatever you want to call it, if
>>> properly implemented and perhaps with a few extra functions  could
>>> solve all the problems of random access.
>>>
>>> I think we just want something with the functionality of push() and
>>> pop() but that can be extracted and kept outside, memorizing the
>>> equivalent of a single stack position, and perhaps with a bit more
>>> functionality.
>>
>> It will be interesting to see how much / little info we can get away
>> with saving and still be able to start an XPath expression from an
>> arbitrary point.
>>
>> Important: it may make the implementation easier if we make the
>> arbitrary starting point the new document root - just for xpath
>> evaluation purposes. I think this is perfect, actually. I don't want
>> anything except for the node and its children - that's why I'm
>> explicitly pointing there in the first place.
>>
>> F.E.
>> (forgive the illegal simplified syntax..)
>>
>> aaa
>>   bbb
>>     ccc    <- Index saved, new root for xpath eval.
>>       eee
>>       fff
>>     /ccc
>>     dd
>> ...
>>
>> I'd want to say something like this:
>>
>> vtdNav.toElement(cccIndex); // reset cursor to ccc
>> ap.selectXPath("/ccc/*")
>>
>> Cheers.
>>
>
>
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