Hi,
--- BoD <[EMAIL PROTECTED]> wrote:
> Hi! I'm trying to use jxpath to easily parse a simple xml file and
> avoid
> using the DOM interfaces.
> But I'm confused about one thing.
> Here is the file I want to analyse:
>
> -xml file--------------------------------------
>
> <?xml version="1.0" encoding="utf-8"?>
> <configurator>
> <field id="test1" type="TextField">
> <ldap-key>test1 ldapkey</ldap-key>
> <label>test1:</label>
> <tooltip>test1 tooltip</tooltip>
> <icon>test1 tooltip</icon>
> <ldap-access>
> <read/>
> <write/>
> </ldap-access>
> <emulation>
> <activex/>
> <java/>
> </emulation>
> <possible-value-labels>
> <label>possible value label 1</label>
> <label>possible value label 2</label>
> <label>possible value label 3</label>
> </possible-value-labels>
> <possible-values>
> <value>toto</value>
> <value>tutu</value>
> <value>titi</value>
> </possible-values>
> <default-values>
> <value>tutu</value>
> </default-values>
> </field>
>
>
> <field id="test2" type="CheckBox">
> <ldap-key>test2 ldapkey</ldap-key>
> <label>test2</label>
> <tooltip>test2 tooltip</tooltip>
> <!--icon>test1 tooltip</icon--> <!-- no icon -->
> <ldap-access>
> <write/>
> </ldap-access>
> <emulation>
> <java/>
> </emulation>
> <!--possible-value-labels/--> <!-- not used in a checkbox -->
> <possible-values>
> <value>toto</value>
> <value>tutu</value>
> </possible-values>
> <default-values>
> <value>tutu</value>
> </default-values>
> </field>
>
> </configurator>
>
> -eof-----------------------------------
>
>
>
> And here is my code, that include my questions in the comments:
>
>
> -java file-----------------------------
>
> // [snip xml file opening]
>
> Element rootNode = doc.getDocumentElement(); // <configurator>
> JXPathContext configuratorContext =
> JXPathContext.newContext(rootNode);
> configuratorContext.setLenient(true); // will return null if a node
> is not
> there, instead of throwing an exception
> Iterator fieldList = configuratorContext.iteratePointers("field");
> while (fieldList.hasNext())
> {
> Pointer pointer = (Pointer)fieldList.next();
>
>
> // first question : is there a better way of doing this, e.g.
> creating
> // a new [sub]context instead of concate pointer everywhere? If so,
> how
> // to do this?
There is currently no better way, but it sounds like it might make
sense to add that kind of functionality. I'll think about it.
> String fieldName =
> (String)configuratorContext.getValue(pointer+"/@id");
> String type =
> (String)configuratorContext.getValue(pointer+"/@type");
> String LDAPKey =
> (String)configuratorContext.getValue(pointer+"/ldap-key");
> String label =
> (String)configuratorContext.getValue(pointer+"/label");
> String toolTip =
> (String)configuratorContext.getValue(pointer+"/tooltip"); // can be
> null
> String icon =
> (String)configuratorContext.getValue(pointer+"/icon"); //
> can be null
>
> int LDAPAccess = 0;
> if
>
(((NodePointer)configuratorContext.getPointer(pointer+"/ldap-access/read")).
> isActual())
> LDAPAccess += Field.LDAP_ACCESS_READ;
> if
>
(((NodePointer)configuratorContext.getPointer(pointer+"/ldap-access/write"))
> .isActual())
> LDAPAccess += Field.LDAP_ACCESS_WRITE;
> int emulation = 0;
> if
>
(((NodePointer)configuratorContext.getPointer(pointer+"/emulation/activex"))
> .isActual())
> emulation += Field.EMULATION_ACTIVEX;
> if
>
(((NodePointer)configuratorContext.getPointer(pointer+"/emulation/java")).is
> Actual())
> emulation += Field.EMULATION_JAVA;
>
> Pointer labelsPointer = =
>
configuratorContext.getPointer(pointer+"/possible-value-labels/label");
> System.out.println(labelsPointer);
>
> // this prints:
> // /field[1]/possible-value-labels[1]/label[1]
> //
> // Why the last '[1]', it's supposed to be a collection so no '[1]' !
The getPointer() method always looks for the first match. The iterate()
method is the one used when you need a collection.
> Iterator possibleValueLabelsIterator =
> configuratorContext.iterate(labelsPointer.asPath());
> while (possibleValueLabelsIterator.hasNext())
> System.out.println(possibleValueLabelsIterator.next());
> // so this one above doesn't work (returns an Iterator with only one
> element)
True.
> // but this one below works:
> Iterator possibleValueLabelsIterator =
> configuratorContext.iterate(pointer+"/possible-value-labels/label");
> while (possibleValueLabelsIterator.hasNext())
> System.out.println(possibleValueLabelsIterator.next());
Correct.
>
> // how come ?
I think it makes sense. A pointer points at an individual element by
definition, so the presense of "[index]" in the path is justified. And
once you have that [index] you are stuck with element it points to.
You might want to use the original path rather than the pointers in the
path concatenation expressions.
>
> -eof-----------------------------------
>
>
> Thank you very much for your help!
> BoD
- Dmitri
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