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Posted to user@commons.apache.org by Richard Sullivan <su...@web.de> on 2005/11/07 16:30:37 UTC
betwixt: can it round-trip a tree structure?
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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Re: betwixt: can it round-trip a tree structure?
Posted by robert burrell donkin <ro...@blueyonder.co.uk>.
hi ryan
that's quite a cool example :)
if you'd fancy contributing it to the betwixt documentation please
submit a patch.
(you'll find information about how to do this by browsing
http://jakarta.apache.com/commons http://jakarta.apache.org and
http://www.apache.org/dev. please attach patches to
http://issues.apache.org/bugzilla since the mailing list usually strips
them.)
- robert
On Mon, 2005-11-07 at 10:16 -0600, Ryan McGuinness wrote:
> 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>
> >
> >
> >
> > ______________________________________________________________________
> > XXL-Speicher, PC-Virenschutz, Spartarife & mehr: Nur im WEB.DE Club!
> > Jetzt gratis testen! http://freemail.web.de/home/landingpad/?mc=021130
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: commons-user-help@jakarta.apache.org
> >
> >
> >
>
>
> -- "Imagination is more important than knowledge" - Albert Einstein.
>
>
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Re: betwixt: can it round-trip a tree structure?
Posted by Ryan McGuinness <ry...@fallingonline.com>.
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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