[Partly answering to myself, in case somebody else has the same problem, and going further with an extended question]
My use case was to build a 3D vector from the apache commons math library, using the constructor with 3 double parameters for the vector coordinates: Vector3D(double, double, double). <http://commons.apache.org/math/apidocs/org/apache/commons/math/geometry/Vector3D.html#Vector3D%28double,%20double,%20double%29> This class is immutable (the coordinates are stored in final fields). The only way I found was to implement complete marshaller/unmarshaller, has described in the Custom marshallers and unmarshallers <http://jibx.sourceforge.net/tutorial/binding-custom.html#marunmar> section of the documentation. Implementing only the unmarshller is impossible, if you use "unmarshaller=some.class.you.wrote", you must also provide the marshaller otherwise JiBX will complain. The main unmarshal method from the IUnmarshaller interface is called with an object as its first parameter, but it seems to be always null (I found no hint about this in the documentation). This was pretty good for me as I wanted to build the vector myself after having unmarshalled the three coordinates. I ended up with something close to this (showing only the unmarshal part): public class Vector3DBinder implements IMarshaller, IUnmarshaller, IAliasable { private final String uri; private final int index; private final String name; public Vector3DBinder() { uri = null; index = 0; name = "vector"; } public Vector3DBinder(final String uri, final int index, final String name) { this.uri = uri; this.index = index; this.name = name; } // skipping the isExtension, marshall and isPresent method public Object unmarshal(final Object object, final IUnmarshallingContext context) throws JiBXException { try { final UnmarshallingContext ctx = (UnmarshallingContext) context; // extract coordinates ctx.parseToStartTag(uri, name); final double x = Double.parseDouble(ctx.attributeText(uri, "x", null)); final double y = Double.parseDouble(ctx.attributeText(uri, "y", null)); final double z = Double.parseDouble(ctx.attributeText(uri, "z", null)); ctx.parsePastStartTag(uri, name); ctx.parsePastEndTag(uri, name); // return a new vector return new Vector3D(x, y, z); } catch (ClassCastException cce) { throw new JiBXException(cce.getMessage(), cce); } } } This method is in a custom Vector3DBinder class. One interesting property of this approach is that JiBX does not attempt to modify the Vector3D class itself, which is simpler as it allows to simply put the commons-math jar as an already built dependency and not to change the build process. I still have a problem, though. I want to extract data from an XML document containing several vectors instances, similar to this reduced exemple: <root> <vector-1 x="1.0" y="0.0" z="0.0"/> <vector-2 x="0.0" y="1.0" z="0.0"/> </root> I was able to do this only with the following binding: <mapping name="root" class="Root"> <structure name="vector-1" field="v1" marshaller="some.package.path.Vector3DBinder" unmarshaller="some.package.path.Vector3DBinder"/> <structure name="vector-2" field="v2" marshaller="some.package.path.Vector3DBinder" unmarshaller="some.package.path.Vector3DBinder"/> </mapping> Since I have lots of vectors in the real file, I would have prefered to use something like: <mapping name="root" class="Root"> <structure name="vector-1" field="v1" /> <structure name="vector-2" field="v2" /> </mapping> <mapping class="org.apache.commons.math.geometry.Vector3D" abstract="true" marshaller="some.package.path.Vector3DBinder" unmarshaller="some.package.path.Vector3DBinder"/> </mapping> Despite the abstract="true" attribute, and the fact the class implements IAliasable, in the second case I get an error while unmarshalling because JiBX expects a "vector" element and not the "vector-1" and "vector-2" elements. The reason for this seems to be that the unmarshaller is built for the no-argument constructor instead of the constructor providing the current name. If I use the first binding, repeating myself the marshaller="..." and unmarshaller="..." everywhere, all works as expected. I don't understand what I do wrong. I guess I misunderstood the abstract="true" attribute and IAliasable interface, but need help to understand them correctly. Thanks, Luc ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ jibx-users mailing list jibx-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jibx-users
