Hi Christian,
First of all, I must apologize and clear some of the mistakes in my previous
mail:
I had first tried with the line:
oParent.appendChild(oChild).appendChild(oChild.cloneNode(false));
and then with simply:
oParent.appendChild(oChild);
Which would result in only one single Child node. Moreover, I had tried the
code with the line
oNodes.add(0, oGuest);
and without it, and
oDocument.insertBefore(oGuest, (Node)oDocument.selectSingleNode("//Child"));
I have tried these two statement separately and printed the document with
System.out.println(oDocument.asXML());
In ALL cases, I am getting the Guest element placed right at the top level.
I didn't understand the last part of your explanation: I DID say that the
tree structure that you drew
parent
|
-guest
|
-child
|
-child
was SUPPOSED to be, had the insertBefore() method worked the way it should
have (that is where we both agree). But it doesn't turn out that way. And I
need to be clear about one thing: after an element has been newly created
with Document.createElement(), and BEFORE it has been appended to a parent
Node, does it already have a postion in the XML Document (according to what
you say?). I don't get any errors, even in runtime - the whole code runs and
gives the output as I have described.
As for the compilation error, there have been some changes in the build in
the last three days, so you'll have to take the daily build in order for the
code to work.
And for your question: why I'm using DOMDocument - no particular reason. I
know there are probably 10 different ways to achieve the same thing, but I
just wanted to explore many possibilities before choosing one of the ways
for my next project. And I wanted especially to explore the w3c.dom classes
because they conform with the MS-DOM structure, that's all.
If you don't mind, I would appreciate some further clarification on this.
Thanks
Soumanjoy
-----Original Message-----
From: Christian Holmqvist, IT, Posten
[mailto:[EMAIL PROTECTED]]
Sent: Thursday, April 25, 2002 12:48 PM
To: 'Soumanjoy Das'; 'James Strachan'; [EMAIL PROTECTED]
Subject: RE: [dom4j-user] Add element between elements in a document.
Hi!
First of all, I could not even run your example, got the error:
java.lang.ClassCastException: org.dom4j.tree.DefaultElement
at org.dom4j.dom.DOMDocument.createElement(DOMDocument.java:209)
at
se.posten.logistik.applications.cr.test.DOM4J_test.<init>(DOM4J_test.java:29
)
at
se.posten.logistik.applications.cr.test.DOM4J_test.main(DOM4J_test.java:90)
But anyway.
If I understand the this correct does this:
oParent.appendChild(oChild).appendChild(oChild.cloneNode(false));
add two child elements like this.
parent
|
-child
|
-child
The list from this command will be of size two containing two child elements
> List oNodes = oDocument.selectNodes("//Child[@id]"); //Will
> retrieve the one
> single Child Element
These are
child
|
-child
AND
child
The next statement of value is
> oNodes.add(0, oGuest); //Doesn't affect the original document
Where in the documentation do you find that this is not references to the
original document. At least I can not find any cloning or detachment in the
doc or code...
But the question is, where does the guest element go. Intutinally I would
say, right before the first child element in the original document,
resulting in a document looking like this:
parent
|
-guest
|
-child
|
-child
and the ofcourse first in the node list.
BUT then this:
> oDocument.insertBefore(oGuest,
(Node)oDocument.selectSingleNode("//Child"));
should not have been allowed because the guest element already got a parent
and a place in the document.
But on the other hand.
The guest element should be placed before the first child element witch is
where the parent element is. And when using this in contrast to that the
node list do indeed affect the org document and there is the guest placed at
position 0 then the result would be that the document looks like your
result.
I would say that the document should look like:
parent
|
-guest
|
-child
|
-child
if it where correct. Don't you think so?
Another question, why do you use the DOMDocument and not the DocumentHelper
and org.Dom4j.Element and Document?
Cheers Christian Holmqvist
> -----Ursprungligt meddelande-----
> Från: Soumanjoy Das [mailto:[EMAIL PROTECTED]]
> Skickat: den 25 april 2002 06:58
> Till: 'James Strachan'; [EMAIL PROTECTED]
> Ämne: RE: [dom4j-user] Add element between elements in a document.
>
>
> Hi,
>
> I still don't get it. If one extracts a list of nodes into a
> Java List by an
> XPath query, and then adds a node into that List, the Node
> doesn't get added
> into the original document from which the list was queried
> (makes sense
> here). The only way to do it is to use the .appenChild() or
> .insertBefore()
> etc. methods of the Document or Element. But I also observe this:
>
> When I create a new Element and try to add it to a Document as:
> document.insertBefore(newChild, refChild), the newChild is
> always inserted
> right at the BEGINNING of the document, BEFORE the document
> element, hence
> making TWO Root elements!!! (Irrespective of refChild). First
> of all, why is
> the function inserting it at the top instead of before the
> refChild element?
> Secondly, why is the function ALLOWING this insert at an
> illegal position -
> because, when I try to open the resultant XML, it obviously
> gives the error
> that there cannot be more than one Root element!
>
> Is this again an issue with org.w3c.dom as opposed to org.dom4j.dom?
>
> Here's the code sample:
>
> import org.w3c.dom.*;
> import org.dom4j.dom.*;
> import java.util.*;
> //import etc...
> //...
>
> DOMDocument oDocument = new DOMDocument("Root");
> //Add a Root element
> Element oParent = oDocument.createElement("Parent");
> oParent.setAttribute("id", "P01");
> //Add a child element
> oDocument.appendChild(oParent);
> Element oChild = oDocument.createElement("Child");
> oChild.setAttribute("id", "C01");
> oParent.appendChild(oChild).appendChild(oChild.cloneNode(false));
> //Get the Child Element in a list
> List oNodes = oDocument.selectNodes("//Child[@id]"); //Will
> retrieve the one
> single Child Element
> Element oGuest = oDocument.createElement("Guest");
> oGuest.setAttribute("name", "newcomer");
> oNodes.add(0, oGuest); //Doesn't affect the original document
> oDocument.insertBefore(oGuest,
> (Node)oDocument.selectSingleNode("//Child"));
> System.out.println(oDocument.asXML());
>
> Here's the Output:
> <Guest name="newcomer"/>
> <Parent id="P01">
> <Child id="C01"/>
> </Parent>
>
> I doubt this is what .insertBefore() is supposed to do. Have I missed
> something here...? An explanation would be appreciated...
> (Here's another
> one for you James :-).
>
> Thanks
> Soumanjoy
>
>
> -----Original Message-----
> From: James Strachan [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, April 23, 2002 8:10 PM
> To: Christian Holmqvist, IT, Posten; [EMAIL PROTECTED]
> Subject: Re: [dom4j-user] Add element between elements in a document.
>
>
> A Branch (a Document or Element) has a method called
> content() which returns
> a modifiable List. So you can use the standard Java 2 List
> interface to
> change the content of an Element or Document.
>
> e.g.
>
> DocumentFactory factory = new DocumentFactory();
> Document doc = factory.createDocument();
> Element root = doc.addElement( "html" );
> Element header = root.addElement( "header" );
> Element footer = root.addElement( "footer" );
>
> // now lets add <foo> in between header & footer
> List list = root.content();
> Element foo = factory.createElement( "foo" );
> list.add( 1, foo );
>
> // assertions
> assertTrue( list.size() == 3 );
> assertTrue( list.get(0) == header );
> assertTrue( list.get(1) == foo );
> assertTrue( list.get(2) == footer );
>
>
> The above code has all been added to the unit test
> dom4j/src/test/org/dom4j/TestContent in the method
> testAddingInTheMiddle().
>
> James
> ----- Original Message -----
> From: "Christian Holmqvist, IT, Posten"
> <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, April 23, 2002 2:32 PM
> Subject: [dom4j-user] Add element between elements in a document.
>
>
> > Hi
> >
> > I have a small problem with adding elements.
> >
> > I got a document that looks something like this:
> >
> > Doc
> > |
> > --- Header
> > |
> > |
> > --- Footer
> >
> > On the document handler class (my class) there is a method
> called add
> > element. This element should be placed in between the header and the
> footer
> > i.e:
> >
> > Doc
> > |
> > --- Header
> > |
> > -> (new element)
> > |
> > --- Footer
> >
> > My problem is that I can not figure out how to add a elemnt
> to a specific
> > position in a document.
> >
> > Help... please...
> >
> > Cheers Christian Holmqvist
> >
> > _______________________________________________
> > dom4j-user mailing list
> > [EMAIL PROTECTED]
> > https://lists.sourceforge.net/lists/listinfo/dom4j-user
>
>
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