vtd-xml-users — This mailing list is for users or people interested in VTD-XML

Re: [Vtd-xml-users] Need more arbitrary random access

[tony y. <gao...@gm...>]

I don't think the push() and pop() pairs can really resolve my problem. As
previous example shows, I need remember all children positions(indexes).
if I invoke many times push(), when pop() from stack who knows which child
pop up?
Remember the DOM reference all node it parsed. As for VTD-XML, it need to be
condidered the similar feature.


-- 
Kindly Regards

Tony
===============================

Re: [Vtd-xml-users] Need more arbitrary random access

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

There is a global stack that you can access. Since it is a stack it is =
first-in last out,
so you can push in a node then pop it back out...
vn.push(); // save the location
....// do what ever you want, such as navigation
vn.pop();   // instantly restore cursor  to the saved location...

Have you tried the demo on the sourceforge web page? it seems to do what =
you have described ...
  ----- Original Message -----=20
  From: tony yin=20
  To: vtd...@li...=20
  Cc: vtd...@li...=20
  Sent: Sunday, July 30, 2006 12:15 AM
  Subject: Re: [Vtd-xml-users] Need more arbitrary random access


  Well. For example:
  <root>
    <child>AAA</child>
    <child>BBB</child>
    <child>CCC</child>
    ...
  </root>
  When processing XML doc in DOM I can reserve every node references in =
my code and exactly retrieve the 2nd "<child>" node back at anytime I =
wanted, there is no need to traverse. That's the point I want to be done =
in VTD-XML Model if I can save the 2nd "<child>" token's index in my =
code. The necessary situation is, I generate a tree in my UI from an XML =
and I want mouse click linking to correct node and display information =
of that node.=20
  Sounds reasonable?

  --=20
  Kindly Regards

  Tony
  =
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=20


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Re: [Vtd-xml-users] Need more arbitrary random access

[tony y. <gao...@gm...>]

Well. For example:
<root>
  <child>AAA</child>
  <child>BBB</child>
  <child>CCC</child>
  ...
</root>
When processing XML doc in DOM I can reserve every node references in my
code and exactly retrieve the 2nd "<child>" node back at anytime I wanted,
there is no need to traverse. That's the point I want to be done in VTD-XML
Model if I can save the 2nd "<child>" token's index in my code. The
necessary situation is, I generate a tree in my UI from an XML and I want
mouse click linking to correct node and display information of that node.
Sounds reasonable?

-- 
Kindly Regards

Tony
===============================

Re: [Vtd-xml-users] Need more arbitrary random access

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

The navigation has to be based on some criteria (such as specificied in =
an XPath expression).
VTD navigator uses an array of integers to represent a particular =
location in XML, "getCurrentIndex"
only returns one those integers in the array...

What would be the equivalent function calls in DOM that does what you =
described??
  ----- Original Message -----=20
  From: tony yin=20
  To: vtd...@li...=20
  Sent: Saturday, July 29, 2006 8:20 AM
  Subject: [Vtd-xml-users] Need more arbitrary random access


  Hi all:

  I know the VTD-XML is based on some kind of cursor navigation. But I =
searched all API docs and can't find how to random access the token I =
wanted. Just a method:
  if (vn.toElement(VTDNav.NEXT_CHILD,"*")) {=20
        //any action
  }
  I think it's not good enough to process my xml. I need another method =
to achieve this:
  method(){
       ancestorTokenIndex =3D vn.getCurrentIndex();
  }
  ...
  foo(){
       vn.toIndex(ancestorTokenIndex);
       int t =3D vn.getText();
       String text =3D vn.toNormalizedString(t) ;
       ...
  }
  Why I need more arbitrary random access? I just need it. And I think =
it's easy to implement because VTD-xml design concept, isn't it?=20

  --=20
  Kindly Regards

  Tony
  =
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=20


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  Take Surveys. Earn Cash. Influence the Future of IT
  Join SourceForge.net's Techsay panel and you'll get the chance to =
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[Vtd-xml-users] Need more arbitrary random access

[tony y. <gao...@gm...>]

Hi all:

I know the VTD-XML is based on some kind of cursor navigation. But I
searched all API docs and can't find how to random access the token I
wanted. Just a method:
if (vn.toElement(VTDNav.NEXT_CHILD,"*")) {
      //any action
}
I think it's not good enough to process my xml. I need another method to
achieve this:
method(){
     ancestorTokenIndex = vn.getCurrentIndex();
}
...
foo(){
     vn.toIndex(ancestorTokenIndex);
     int t = vn.getText();
     String text = vn.toNormalizedString(t) ;
     ...
}
Why I need more arbitrary random access? I just need it. And I think it's
easy to implement because VTD-xml design concept, isn't it?

-- 
Kindly Regards

Tony
===============================

Re: [Vtd-xml-users] multiple context objects

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

Similar issues have been raised before, yes we are still thinking about =
that...=20
original design goal is to keep as much complexity out of the =
implementation as possible, the problem of=20
multiple context object is that once we give people more than one =
cursor, people will want even more,=20
potentially making position tracking difficult ... the goal is KISS, =
keep it simple and stupid...

regarding LC entry, yes, there is a way, but requires hacking on your =
side, also for nodes that goes beyond
depth 4, linear scan is used to locate child nodes...
so the best/simplest way is to wrap around vn.toElement(FIRST_CHILD)....
it will take care of everything...=20

  ----- Original Message -----=20
  From: Aakash Jain=20
  To: Jimmy Zhang=20
  Sent: Tuesday, June 13, 2006 11:28 PM
  Subject: Re: multiple context objects


  In place of providing multiple context object, it can provide context =
save and load methods. Currently it provides push and pop methods that =
operate on VTD's stack only. But the user cannot save and load the =
context in his defined stack or some other array.=20

  Regarding the hasChild() problem:
  The lower 32 bits in LC entry contains -1 if there is no child of a =
node. Is there a way to access that entry. Because this will be a =
straight forward check to know if the node has child or not.=20


  --=20

  Aakash Jain
  PUCSD
  Ph : 91 9844223652=20

  " There are 10 types of people in this world, those who understand =
binary and others who don't. "


  On 6/14/06, Jimmy Zhang <cra...@co...> wrote:
    Sorry for the late reply...
    right now VTD-XML doesn't implement multiple context object, because =
a
    context
    object is a global variable so you can use it across procedures... =
and we
    have yet to
    come across a scenario where multiple context object is needed...=20

    the best way to check whether a node has child or not is navigate to =
it and
    check
    the result value...

    if (vn.toElement(VTDNav.FC)  =3D=3D false)

       {// no child

       }
    else {
      vn.toElement (VTDNav.P); // return to the orginal node
      // has child...

    }

    let me know if there is any further question...

Re: [Vtd-xml-users] find attribute value by index

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

Yes, but vn.getCurrentIndex() will get you the index value of the cursor =
element...
  ----- Original Message -----=20
  From: Aakash Jain=20
  To: Jimmy Zhang=20
  Sent: Tuesday, June 13, 2006 11:36 PM
  Subject: Re: find attribute value by index


  getRootIndex() returns the inddex of the root element of the xml tree.

  eg:

  <root>
      <child attr1=3D"val1"/>
      <child attr1=3D"val2"/>
  </root>

  so, no matter where your context object is , it will always return =
index for "root".=20



  On 6/14/06, Jimmy Zhang <cra...@co...> wrote:
    It can be done let me give an example..
    The XML snippet is as follows:

    <test attr1=3D'val1'  attr2 =3D 'val2' />

    vn.getRootIndex() will get you the index value of "test" element, =
which is
    root....=20

    say its index is 1;

    then next few tokens

    attr1 ---> index value is 2
    val1  =3D=3D>index value is 3
    attr2 ----> index is 4
    val2  =3D=3D> index value is 5

    make sure you check for the token type at the given index values=20
    using vn.getTokenType(int i)..

    possible token types are ATTR_VAL, ATTR_NAME, ATTR_NS (for =
namespace)


    >How can we find an attribute's value by number?

    >Like we have VTDNav.getAttrValue(String)=20

    >but that gives the value given the key.
    >What if i dont know the key?

    >Help!!!!!!!!!!!!!!






  --=20
  " There are 10 types of people in this world, those who understand =
binary and others who don't. "=20

  Aakash Jain
  PUCSD
  Ph : 91 9844223652 

Re: [Vtd-xml-users] Node Operation Question, How To Insert , Delete , Update Node with VTD-XML

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

VTD-XML's XML content exchange is at the byte level, which is different =
from DOM.
VTD-XML allows you to update the individulal token value, or cut away a =
chunk...
there is going to be an article called "cut, paste, split and assemble =
XML with VTD-XML"
coming out next month in Javaworld that will dig into those features....

Re: [Vtd-xml-users] find attribute value by index

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

It can be done let me give an example..
The XML snippet is as follows:

<test attr1=3D'val1'  attr2 =3D 'val2' />

vn.getRootIndex() will get you the index value of "test" element, which =
is=20
root....

say its index is 1;

then next few tokens

attr1 ---> index value is 2
val1  =3D=3D>index value is 3
attr2 ----> index is 4
val2  =3D=3D> index value is 5

make sure you check for the token type at the given index values
using vn.getTokenType(int i)..

possible token types are ATTR_VAL, ATTR_NAME, ATTR_NS (for namespace)


>How can we find an attribute's value by number?

 >Like we have VTDNav.getAttrValue(String)

 >but that gives the value given the key.
 >What if i dont know the key?

 >Help!!!!!!!!!!!!!!

Re: [Vtd-xml-users] multiple context objects

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

Sorry for the late reply...
right now VTD-XML doesn't implement multiple context object, because a=20
context
object is a global variable so you can use it across procedures... and =
we=20
have yet to
come across a scenario where multiple context object is needed...

the best way to check whether a node has child or not is navigate to it =
and=20
check
the result value...

if (vn.toElement(VTDNav.FC)  =3D=3D false)

   {// no child

   }
else {
  vn.toElement(VTDNav.P); // return to the orginal node
  // has child...

}

let me know if there is any further question...

[Vtd-xml-users] Node Operation Question, How To Insert , Delete , Update Node with VTD-XML?

[Sun Z. <zhi...@gm...>]

Hello everyone

 Node Operation Question, How To Insert , Delete , Update Node with VTD-XML?

[Vtd-xml-users] Finding attribute value by index

[Aakash J. <aak...@gm...>]

How can we find an attribute's value by number?

Like we have VTDNav.getAttrValue(String)

but that gives the value given the key.
What if i dont know the key?

Help!!!!!!!!!!!!!!

--=20
" There are 10 types of people in this world, those who understand binary
and others who don't. "

Aakash Jain
PUCSD
Ph : 91 9844223652

[Vtd-xml-users] Multiple context objects

[Aakash J. <aak...@gm...>]

Can we have multiple context objects in VTD?
As we can have multiple nodes in a DOM parse tree?

Also is there a way to check whether an element has some children.

One possible way is:

vn.toElement(VTDNav.FC)

but this changes the current context

is there some function like hasChild()


--=20
" There are 10 types of people in this world, those who understand binary
and others who don't. "

Aakash Jain
PUCSD
Ph : 91 9844223652