[sword-devel] Fastest way of counting verses

[Troy A. Griffitts]

Thanks Manfred,

I have your previous posts on this one in my inbox still to debug.  I 
really appreciated the feedback even if I don't always reply right away. 
  Please don't stop reminding me though.

	-Troy.



Manfred Bergmann wrote:
> Hi Troy.
> 
> The speed of the library is good but we're producing some overhead for 
> display like adding markers to the text in order to synchronize between 
> views and such.
> The overall speed is still ok but if the user pulls more books like 
> 1-5Mose then it can take 7 - 10 secs.
> However that's for your snippets, I could speed up some things here.
> 
> Here is something interesting:
> (a not existing key is used in the examples).
> 
> ---------------------------
> sword::VerseKey    vk;
> sword::ListKey lk = vk.ParseVerseList("Par.1.1", vk, true);
> lk.Persist(true);
> swModule->setKey(lk);
> for ((*swModule) = sword::TOP; !swModule->Error(); (*swModule)++) {
>     // do something
>     ...
> }
> --------------------------
> The above crashes at (*swModule) = sword::TOP.
> 
> ---------------------------
> sword::VerseKey    vk;
> sword::ListKey lk = vk.ParseVerseList("Par.1.1", vk, true);
> //lk.Persist(true);
> swModule->setKey(lk);
> for ((*swModule) = sword::TOP; !swModule->Error(); (*swModule)++) {
>     // do something
>     ...
> }
> --------------------------
> This doesn't crash but iteration starts at Gen 1.
> Note, Persist() is commented.
> 
> --------------------------
> sword::VerseKey    vk;
> sword::ListKey lk = vk.ParseVerseList("Par.1.1", vk, true);
> for (lk = sword::TOP; !lk.Error(); lk++) {
>     swModule->setKey(lk);
>     // do something
> }
> --------------------------
> This produces the correct output - nothing, loop is not entered.
> 
> 
> 
> Regards,
> Manfred
> 
> Am 12.03.2009 um 13:19 schrieb Troy A. Griffitts:
> 
>> Manfred,
>>
>> Are you specifically asking about how to obtain the ordinal count of a 
>> traversable SWKey?
>>
>> If so, the official answer is, "you can't without counting yourself". 
>> SWKey's which return true for isTraversible() don't contractually 
>> offer their set count.  This is fairly common with optimized object 
>> containers who's set count is not easily derived (think of linked lists).
>>
>> Having said this, SWKey offers a bookmarking facility with long 
>> SWKey::Index(), SWKey::Index(long).
>>
>> The longs can _usually_ be used to practically bound a 'range'.
>>
>> e.g.
>>
>> VerseKey *parser = (VerseKey *)kjv->getKey();
>> ListKey keySet = parser->ParseVerseList("matt-jn", parser, true);
>>
>> keySet = TOP;
>> long start = keySet.Index();
>> keySet = BOTTOM;
>> long end = keySet.Index();
>>
>> progressBar.setStart(start);
>> progressBar.setEnd(end);
>>
>>
>> for (keySet = TOP; !keySet.Error(); keySet++) {
>>     progressBar.setValue(keySet.Index());
>>     // process text here...
>> }
>>
>>
>> // Having said this, a few points:
>>
>> obvious fail case: "gen; rev22:21"
>>
>> true ordinal count:
>> long i = 0; for (keySet = TOP; !keySet.Error(); keySet++) i++;
>>
>> finally, processing a set of display data should really not take 
>> humanly noticeable times on even old desktop computers (or even 
>> reasonably recent mobile devices).  We've actually, recently been 
>> trying to optimize things on mobile devices for SwordReader and as we 
>> continue to make improvements for these devices you should see 
>> improvements on all platforms.  Please let us know with a snippet of 
>> code which demonstrates an iteration which takes any noticeable time 
>> to complete.
>>
>>     -Troy.
>>
>>
>>
>>
>>
>> Manfred Bergmann wrote:
>>> Hi.
>>> Another APi question:
>>> In order to show a progress indicator to not bore the user when the 
>>> cursor ball spins and a text pull takes a little longer I want to 
>>> know how many verses need to be pulled before actually doing it.
>>> This can be for any reference the user enters, "gen" or "gen 1,6,9" 
>>> or anything like that.
>>> What is the fastest way to do that?
>>> Regards,
>>> Manfred
>>> _______________________________________________
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>>
>>
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> 
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