Richard,
I had a similar issue, but was able to resolve it with .betwixt files, and
a simple collections class.
The example if for a reflexive questionaire:
Questionnaire
QuestionaireInfo
QuestionGroup
Question
QuestionGroup
Question...
/QuestionGroup
/Question
Question
QuestionGroup...
Questions:
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
Questionnaire:
...
Questions questions = new Questions();
...
addQuestion(Question q) {
questions.add(q);
}
Questionnare Betwixt:
<?xml version='1.0'?>
<info>
<element name='rq:questionnaire'>
<attribute name="xmlns:rq" value="some namespace" />
<element name='rq:questionnaireInfo'
property='questionnaireInfo' />
<element name='rq:questionGroup' property='questions'/>
</element>
</info>
Question:
...
Questions questions = new Questions();
...
addQuestion(Question q) {
questions.add(q);
}
Question Betwixt:
<?xml version='1.0'?>
<info>
<element name='rq:question'>
...
<element name='rq:questionGroup' property='questions' />
</element>
</info>
public class Questions {
private List questions = new ArrayList();
public Iterator getQuestions() {
return questions.iterator();
}
public void addQuestion(Question question) {
questions.add(question);
}
public int size() {
return questions.size();
}
}
Questions Betwixt:
<?xml version='1.0'?>
<info>
<element name='rq:questionGroup'>
<element property='questions'
updater='addQuestion' />
</element>
</info>
This could be applied to your objects quite easily.
Hope this helps.
Ryan -
>
> Hi,
>
> I am trying to model a budget as a tree structure.
>
> For example:
>
> A1 [parent] Eligible costs
> A1.1 [parent] Personnel
> A1.2 [parent] Travel and accomodation
> A1.2.1 [parent] Travel
> A1.2.1.1 [Leaf] Travel - London Brussels 19/11/2005
> A1.2.1.2 [Leaf] Travel - Amsterdam Brussels 21/11/2005
>
>
> Expense-categories are non-leaf items in the tree (modelled by the java
> class BudgetNonLeafItemImpl) and individual expense items are leaves
> (BudgetLeafItemImpl ).
>
>
> Both types of node have many fields and operations in common which they
> inherit from a common base class (BaseBudgetItemImpl).
>
> A simplified skeleton of the source code looks like the follows:
>
> public abstract class BaseBudgetItemImpl {
> public abstract boolean isLeafItemType();
> //
> }
>
> public class BudgetLeafItemImpl extends BaseBudgetItemImpl {
> /** Is this an item at the extremity of the tree - yes always */
> public boolean isLeafItemType() { return true; }
> //
> }
>
>
> public class BudgetNonLeafItemImpl extends BaseBudgetItemImpl {
>
> /** Is this an item at the extremity of the tree - no never */
> public boolean isLeafItemType() { return false; }
>
> public List getChildren() {
}
>
> public BaseBudgetItemImpl addChild(BaseBudgetItemImpl child) {
}
>
> private ArrayList children = new ArrayList(); // holds references to
> leaf- or non-leaf items !
> //
> }
>
>
> Does it make sense to try to use Betwixt to read/write (round-trip) such a
> structure or would another tool (Castor ?) be better for the job ?
>
> I started trying to write the xml and this works fine (see actual output
> from an attempted round-trip of the more complex real classes below). I
> managed to read back the root node but none of the children get restored.
>
> The basic question is if Betwixt can handle the recursive relationship -
> the root node will be of type non-leaf and this will contain a mixture of
> leaf and non-leaf items in the "children" collection. The non-leaf nodes
> may of course then themselves have children of both types.
>
> Thanks,
> Richard SULLIVAN
>
>
>
>
> XML output:
> =========<?xml version="1.0"?> <budgetNonLeafItemImpl id="1">
> <child id="2">
> <basicLayoutInfo id="3">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <canAddOnlyLeaves>false</canAddOnlyLeaves>
> <descriptions/>
> <leafItemType>false</leafItemType>
> <mandatory>true</mandatory>
> <optionalId/>
> <title>A1.1 Personnel</title>
> <toolTipText/>
> <usageNotes/>
> <valid>true</valid>
> </child>
> <child id="4">
> <child id="5">
> <child id="6">
> <basicLayoutInfo id="7">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <descriptions/>
> <leafItemType>true</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1.2.1.1 Travel - London Brussels</title>
> <valid>false</valid>
> <values>
> <value>London</value>
> <value>Brussels</value>
> <value>Air</value>
> <value>132.11</value>
> <value>3</value>
> </values>
> </child>
> <child id="8">
> <basicLayoutInfo id="9">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <descriptions/>
> <leafItemType>true</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1.2.1.2 Travel - Amsterdam Brussels</title>
> <valid>false</valid>
> <values>
> <value/>
> <value/>
> <value/>
> <value>100.0</value>
> <value>1</value>
> </values>
> </child>
> <basicLayoutInfo id="10">
> <attachTo/>
> <table>true</table>
> </basicLayoutInfo>
> <canAddOnlyLeaves>true</canAddOnlyLeaves>
> <descriptions>
> <description>London-Brussels</description>
> <description>Brussels-London</description>
> <description>Method</description>
> <description>Cost per person</description>
> <description>Nr. Persons</description>
> </descriptions>
> <leafItemType>false</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1.2.1 Travel</title>
> <toolTipText/>
> <usageNotes/>
> <valid>true</valid>
> </child>
> <basicLayoutInfo id="11">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <canAddOnlyLeaves>false</canAddOnlyLeaves>
> <descriptions/>
> <leafItemType>false</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1.2 Travel and accomodation</title>
> <toolTipText/>
> <usageNotes/>
> <valid>true</valid>
> </child>
> <child id="12">
> <child id="13">
> <child id="14">
> <basicLayoutInfo id="15">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <descriptions>
> <description>English</description>
> <description>French</description>
> <description>Cost per page (Euro)</description>
> <description>Nr. pages</description>
> </descriptions>
> <leafItemType>true</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1.3.1.1 Translation of questionaire for all member
> states</title>
> <valid>true</valid>
> <values>
> <value/>
> <value/>
> <value>10.5</value>
> <value>10</value>
> </values>
> </child>
> <child id="16">
> <basicLayoutInfo id="17">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <descriptions>
> <description>English</description>
> <description>French</description>
> <description>Cost per page (Euro)</description>
> <description>Nr. pages</description>
> </descriptions>
> <leafItemType>true</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1.3.1.1 Translation of questionaire for all member
> states</title>
> <valid>true</valid>
> <values>
> <value/>
> <value/>
> <value>10.5</value>
> <value>10</value>
> </values>
> </child>
> <basicLayoutInfo id="18">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <canAddOnlyLeaves>false</canAddOnlyLeaves>
> <descriptions/>
> <leafItemType>false</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1.3.1 Implementation costs - Translations</title>
> <toolTipText/>
> <usageNotes/>
> <valid>true</valid>
> </child>
> <basicLayoutInfo id="19">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <canAddOnlyLeaves>false</canAddOnlyLeaves>
> <descriptions/>
> <leafItemType>false</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1.3 Implementation costs</title>
> <toolTipText/>
> <usageNotes/>
> <valid>true</valid>
> </child>
> <child id="20">
> <child id="21">
> <basicLayoutInfo id="22">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <descriptions>
> <description>Audit fees</description>
> </descriptions>
> <leafItemType>true</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1.4.1 Audit reports</title>
> <valid>true</valid>
> <values>
> <value>0.0</value>
> </values>
> </child>
> <child id="23">
> <basicLayoutInfo id="24">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <descriptions>
> <description>Cost of obtaining financial guarantee</description>
> </descriptions>
> <leafItemType>true</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1.4.2 Financial guarantee</title>
> <valid>true</valid>
> <values>
> <value>0.0</value>
> </values>
> </child>
> <basicLayoutInfo id="25">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <canAddOnlyLeaves>true</canAddOnlyLeaves>
> <descriptions/>
> <leafItemType>false</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1.4 Frais résultant d'exigences de la convention</title>
> <toolTipText/>
> <usageNotes/>
> <valid>true</valid>
> </child>
> <child id="26">
> <child id="27">
> <basicLayoutInfo id="28">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <descriptions>
> <description>General expenses</description>
> </descriptions>
> <leafItemType>true</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1.7.1 General expenses</title>
> <valid>true</valid>
> <values>
> <value>0.0</value>
> </values>
> </child>
> <basicLayoutInfo id="29">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <canAddOnlyLeaves>true</canAddOnlyLeaves>
> <descriptions/>
> <leafItemType>false</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1.7 Indirect and other costs (max 7% of eligible
> costs)</title>
> <toolTipText/>
> <usageNotes/>
> <valid>true</valid>
> </child>
> <basicLayoutInfo id="30">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <canAddOnlyLeaves>false</canAddOnlyLeaves>
> <descriptions/>
> <leafItemType>false</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1 Eligible costs</title>
> <toolTipText/>
> <usageNotes/>
> <valid>true</valid>
> </budgetNonLeafItemImpl>
>
>
>
> XML parsed back to object then regenerated:
> =========================================<?xml version="1.0"?>
> <budgetNonLeafItemImpl id="1">
> <basicLayoutInfo id="2">
> <attachTo/>
> <table>false</table>
> </basicLayoutInfo>
> <canAddOnlyLeaves>false</canAddOnlyLeaves>
> <descriptions/>
> <leafItemType>false</leafItemType>
> <mandatory>false</mandatory>
> <optionalId/>
> <title>A1 Eligible costs</title>
> <toolTipText/>
> <usageNotes/>
> <valid>true</valid>
> </budgetNonLeafItemImpl>
>
>
>
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