JAXB: polymorphism with generics
I'm trying to use JAXB (inside Jersey) for polymorphism with generics:
@XmlRootElement
public class Performance<M extends IMeasurement> {
@XmlAnyElement
private List<M> measurement;
}
@XmlJavaTypeAdapter(MeasurementAbstract.Adapter.class)
public interface IMeasurement<D extends Serializable, V extends Number>
extends Serializable {
D getDate();
void setDate(D date);
V getValue();
void setValue(V value);
}
@XmlTransient
@XmlAccessorType(XmlAccessType.FIELD)
@XmlSeeAlso({MeasurementStringDouble.class, MeasurementStringInteger.class})
public abstract class MeasurementAbstract<D extends Serializable, V extends Number> implements IMeasurement<D, V> {
@XmlElement
protected D date;
@XmlElement
protected V value;
static class Adapter extends XmlAdapter<MeasurementAbstract, IMeasurement> {
public IMeasurement unmarshal(MeasurementAbstract m) { return m; }
public MeasurementAbstract marshal(IMeasurement v) { return (MeasurementAbstract) v; }
}
}
@XmlRootElement
public class MeasurementStringDouble extends MeasurementAbstract<String, Double> {}
@XmlRootElement
public class MeasurementStringInteger extends MeasurementAbstract<String, Integer> {}
I have this error:
GRAVE: Mapped exception to response: 500 (Internal Server Error) javax.ws.rs.WebApplicationException: javax.xml.bind.MarshalException - with linked exception: [javax.xml.bind.JAXBException: class org.test.jaxb.MeasurementStringDouble nor any of its super class is known to this context.]
I found a solution to solve this problem:
@XmlRootElement
public class Performance<M extends IMeasurement> {
@XmlElementWrapper(name = "measurementsPerformance")
@XmlElements({
@XmlElement(name = "measurement", type = MeasurementStringDouble.class),
@XmlElement(name = "measurement", type = MeasurementStringInteger.class)})
private List<M> measurement;
}
public interface IMeasurement<D extends Serializable, V extends Number> extends Serializable {
D getDate();
void setDate(D date);
V getValue();
void setValue(V value);
}
@XmlTransient
public abstract class MeasurementAbstract<D extends Serializable, V extends Number> implements IMeasurement<D, V>, Serializable {
protected D date;
protected V value;
}
@XmlRootElement
@XmlAccessorType(XmlAccessType.PROPERTY)
public class MeasurementStringDouble extends MeasurementAbstract<String, Double> {
@XmlElement
@Override
public String getDate() {
return date;
}
@XmlElement
@Override
public Double getValue() {
return value;
}
}
@XmlRootElement
@XmlAccessorType(XmlAccessType.PROPERTY)
public class MeasurementStringInteger extends MeasurementAbstract<String, Integer> {
@XmlElement
@Override
public String getDate() {
return date;
}
@XmlElement
@Override
public Integer getValue() {
return value;
}
}
The drawback of this solution is duplicate the getters/setters in sub-classes.
链接地址: http://www.djcxy.com/p/14666.html上一篇: 如何在c中使用全局变量?
下一篇: JAXB:与泛型相关的多态性