Hi Dennis:
Thanks for the prompt & helpful reply. The only gotcha I found was making sure
the individual marshallings got written to the underlying stream: so I got a
reference to the XML writer and flush()'d it. Result:
IXMLWriter wrapperWriter = null;
for ( int i = 0; i < objects.size(); i++ ) {
Object object = objects.get( i );
IBindingFactory bFact = BindingDirectory.getFactory( object.getClass() );
IMarshallingContext mCtx = bFact.createMarshallingContext();
mCtx.setIndent( 4 );
mCtx.setOutput( out, "UTF-8" );
IXMLWriter writer = mCtx.getXmlWriter();
// set up document
if ( i == 0 ) {
mCtx.startDocument( "UTF-8", null );
writer.startTagClosed( 0, "wrapperElement" );
wrapperWriter = writer;
}
// marshall object
((IMarshallable)object).marshal( mCtx );
writer.flush();
// clean up after last object
if ( i == objects.size() - 1 ) {
wrapperWriter.endTag( 0, "wrapperElement" );
wrapperWriter.flush();
}
}
Regards,
Richard Rodgers
Quoting Dennis Sosnoski <[EMAIL PROTECTED]>:
> Hi Richard,
>
> You don't need to know the index of the object class to make your code
> work, you can just cast the instance of the class to IMarshallable and
> call the marshal() method on the object instance. This interface is
> added by JiBX as part of the binding compile.
>
> Aside from that, in order for the result to be a valid XML document
> you're going to need to add a wrapper element around all these
> individual roots. Writing text directly to the output stream is
> generally not a great way of doing things - another alternative would be
> to just add writing the XML declaration and the wrapper element start
> tag inside your loop (after you've gotten the marshalling context, and
> only when i == 0), then finish with the wrapper element end tag when
> after writing the root at i == roots.length-1.
>
> - Dennis
>
> Dennis M. Sosnoski
> SOA, Web Services, and XML
> Training and Consulting
> http://www.sosnoski.com - http://www.sosnoski.co.nz
> Seattle, WA +1-425-296-6194 - Wellington, NZ +64-4-298-6117
>
>
>
> Richard Rodgers wrote:
>> Hello:
>>
>> I have what I think is a straightforward operation I don't know how to
>> accomplish in JiBX - I want to marshall several different objects
>> into a single
>> document, but the objects may have different marshalling contexts.
>>
>> For example, the code (where 'out' is an OutputStream)
>>
>> IBindingFactory bFact = BindingDirectory.getFactory( object.getClass() );
>> IMarshallingContext mCtx = bFact.createMarshallingContext();
>> mCtx.setIndent( 4 );
>> mCtx.marshalDocument( object, "UTF-8", null, out );
>>
>> works fine if the document file will contain only the object rooted
>> at 'object';
>> but if I have several such objects, where the call to 'getFactory'
>> might return
>> a different factory, I gather I have to do something like this to build a
>> document
>> (with Object[] roots ):
>>
>> 1 // manually construct the XML declaration
>> 2 out.write( "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n".getBytes() );
>> 3
>> 4 // loop thru all objects
>> 5 for ( int i = 0; i < roots.length; i++ ) {
>> 6 IBindingFactory bFact = BindingDirectory.getFactory(
>> roots[i].getClass()
>> );
>> 7 IMarshallingContext mCtx = bFact.createMarshallingContext();
>> 8 mCtx.setIndent( 4 );
>> 9 mCtx.setOutput( out, "UTF-8" );
>> 10
>> 11 if ( i < roots.length - 1 ) {
>> 12 // this invocation won't call 'endDocument', so I can add
>> other objects
>> 13 IMarshaller mr = mCtx.getMarshaller( index,
>> roots[i].getClass().getName()
>> );
>> 14 mr.marshal( object, mCtx );
>> 15 }
>> 16 else {
>> 17 // this final invocation will call 'endDocument' and
>> properly close file
>> 18 mCtx.marshallDocument( roots[i] );
>> 19 }
>> 20 }
>>
>> The problem is in line 13: I don't know how to get the correct value for
>> 'index'.
>> The JavaDoc says 'class index for marshalling definition' but I
>> have no idea
>> what that means,
>> much less how to obtain it programmatically. I searched in vain for sample
>> code that works like this.
>>
>> Any help much appreciated, either in explaining this API, or even
>> an alternate
>> approach that
>> skins the cat another way...
>>
>> Thanks a lot,
>>
>> Richard Rodgers
>>
>>
>> -------------------------------------------------------------------------
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>>
>
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