Exception when trying to declare a property with a generic type and a constraint
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Key: QI-53
URL: http://issues.ops4j.org/jira/browse/QI-53
Project: Qi4j
Issue Type: Bug
Components: Core Runtime
Affects Versions: 0.2
Reporter: Richard Wallace
Assignee: Rickard Öberg
(First reported in thread on mailing list
http://lists.ops4j.org/pipermail/qi4j-dev/2008-May/002094.html)
I'm trying to create a composite called CostPerUnit with the Amount,
Money, and Unit classes that are part of JSR-275 and JScience. It looks
like this
public interface CostPerUnit {
@NotNull ImmutableProperty<Amount<Money>> cost();
@NotNull ImmutableProperty<Unit<?>> unit();
CostPerUnit toCostPer(@NotNull Unit<?> unit);
}
then my mixin that implements the toCostPer(unit) method is
public abstract class CostPerUnitMixin implements CostPerUnit {
@This CostPerUnit costPerUnit;
@Structure CompositeBuilderFactory builderFactory;
public @Cached CostPerUnit toCostPer(Unit<?> unit) {
CompositeBuilder<CostPerUnitComposite> builder =
builderFactory.newCompositeBuilder(CostPerUnitComposite.class);
builder.stateOfComposite().cost().set(convert(costPerUnit.cost().get(),
costPerUnit.unit().get(), unit));
builder.stateOfComposite().unit().set(unit);
return builder.newInstance();
}
Amount<Money> convert(Amount<Money> cost, Unit<?> from, Unit<?> to) {
UnitConverter converter = from.getConverterTo(to);
return
Amount.valueOf(converter.convert(cost.getEstimatedValue()), cost.getUnit());
}
}
and then I have a composite defined as
@Mixins({CostPerUnitMixin.class})
public interface CostPerUnitComposite extends CostPerUnit, Composite {}
So naturally I wanted to test the conversion was working - I don't
really expect it to be but that's what the test is for. But when I try
and run the test I get the following exception
java.lang.ClassCastException:
sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl cannot be
cast to java.lang.Class
at
org.qi4j.spi.composite.CompositeModel.getConstraintModel(CompositeModel.java:215)
at
org.qi4j.runtime.composite.CompositeResolver.addConstraintResolution(CompositeResolver.java:429)
at
org.qi4j.runtime.composite.CompositeResolver.resolvePropertyModel(CompositeResolver.java:419)
at
org.qi4j.runtime.composite.CompositeResolver.resolveMixin(CompositeResolver.java:152)
at
org.qi4j.runtime.composite.CompositeResolver.getResolvedMixins(CompositeResolver.java:223)
at
org.qi4j.runtime.composite.CompositeResolver.resolveCompositeModel(CompositeResolver.java:69)
If I take out the Amount<Money> and replace it with a Long and then take
out the unit property, the CompositeBuilder is able to create a
CostPerUnitComposite instance just fine.
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