cucumber-jvm: proposal for specifying default xstream converters

FooStepDefs.java

package features.foo.alternative;

import org.apache.commons.collections.Bag;

import cucumber.annotation.en.Given;
import cucumber.runtime.xstream.converters.basic.AbstractSingleValueConverter;
import features.foo.alternative.DefaultConvertersAlternative2.Baz;
import features.foo.alternative.DefaultConvertersAlternative2.Foo;
import features.foo.alternative.DefaultConvertersAlternative2.FooConverter;
import features.foo.subclass.FooStepDefsWithExternalFooAndSubclassing.ExternalFooSubclass;

@StepDefOptions(
	defaultConverters = {
		@Mapping(type = Foo.class, converter = FooConverter.class),
		@Mapping(type = Bag.class, converter = BarConverter.class),
		@Mapping(type = Baz.class, converter = BazConverter.class),
	})
public class FooStepDefs {

	@Given("^I have some foo named \"([^\"]*)\"$")
	public void I_have_some_foo_named(Foo foo) {
		Assert.assertNotNull(foo.getName());
	}

	@Given("^I have some stuff in a data table:$")
	public void I_have_some_stuff_in_a_data_table(List<StuffInTable> stuffInTable) {
		for (StuffInTable stuff : stuffInTable) {
			Assert.assertNotNull(stuff.foo.getName());
			Assert.assertNotNull(stuff.bar.getName());
			Assert.assertNotNull(stuff.baz.getName());
		}
	}

	public static class StuffInTable {
		public Foo foo;
		// override default converter if necessary
		@XStreamConverter(AlternativeBarConverter.class)
		public Bar bar;
		public Baz baz;
	}
}

Mapping.java

package features.foo.alternative;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

@Retention(RetentionPolicy.RUNTIME)
public static @interface Mapping {
	Class<?> type();
	Class<? extends ConverterMatcher> converter();
}

StepDefOptions.java

package features.foo.alternative;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.TYPE })
public static @interface StepDefOptions {
	Mapping[] defaultConverters();
}