Everyone-
I recently ran across a situation where it would be beneficial to use auto-naming for attributes (rather than elements), and I was wondering if this had ever come up before (I didn't find anything in the list archives).
As motivation, consider the following example:
public class DataContainer
{
private Map data; public Map getData()
{
return data;
} public void setData( Map data )
{
this.data = data;
}
}The following code instantiates the above class and then marshals it out (error handling removed):
public class DataToXML
{
public static void main( String[] args )
{
HashMap mapData = new HashMap();
mapData.put( "Boolean1", new Boolean( true ) );
mapData.put( "String1", "Test1" );
mapData.put( "Boolean2", new Boolean( false ) );
mapData.put( "String2", "Test2" ); DataContainer myData = new DataContainer();
myData.setData( mapData ); Mapping myMap = new Mapping();
myMap.loadMapping( "dataContainerMap.xml" );
Marshaller m1 = new Marshaller( new FileWriter( "myData.xml") );
m1.setMapping( myMap );
m1.marshal( myData );
}
}Following is what I would like (note: this probably also involves the bug with deriveByClass and the location attribute):
<DataContainer>
<DataMap>
<DataEntry dataKey="Boolean1" boolean="true" />
<DataEntry dataKey="String1" string="Test1" />
<DataEntry dataKey="Boolean2" boolean="false" />
<DataEntry dataKey="String2" string="Test2" />
</DataMap>
</DataContainer>Currently, when I specify node="attribute" and auto-naming="deriveByClass" I get a NPE as follows (note: in this case I am not using the location attribute as it is a known bug):
java.lang.NullPointerException
at org.apache.xml.serialize.XMLSerializer.startElement(XMLSerializer.java:421)
at org.exolab.castor.xml.util.DocumentHandlerAdapter.startElement(DocumentHandlerAdapter.java:197)
at org.exolab.castor.xml.Marshaller.marshal(Marshaller.java:1327)
at org.exolab.castor.xml.Marshaller.marshal(Marshaller.java:1543)
at org.exolab.castor.xml.Marshaller.marshal(Marshaller.java:782)
at DataToXML.main(DataToXML.java:51)
Exception in thread "main"
The complete mapping file is below:
<?xml version="1.0"?>
<!DOCTYPE mapping PUBLIC "-//EXOLAB/Castor Object Mapping DTD Version 1.0//EN" "http://castor.exolab.org/mapping.dtd";>
<mapping>
<class name="DataContainer">
<map-to xml="DataContainer" />
<field name="data" collection="map">
<bind-xml name="DataEntry">
<class name="org.exolab.castor.mapping.MapItem">
<field name="key" type="string">
<bind-xml name="dataKey" node="attribute"/>
</field>
<field name="value">
<bind-xml auto-naming="deriveByClass" node="attribute" />
</field>
</class>
</bind-xml>
</field>
</class>
</mapping>Any comments or suggestions would be greatly appreciated. Thanks for you time.
Stephen
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