无法应用@XStreamConverter ToAttributedValueConverter

Question

我想要一些XML树类作为文本节点解组，但是在我的用例中无法使用它：抽象类层次结构。

我尝试以编程方式注册转换器，在具体类上声明它（API doc甚至表示继承了字段的处理）。

@Bean
public Marshaller marshaller() {
    XStreamMarshaller marshaller = new XStreamMarshaller();
    marshaller.setAutodetectAnnotations(true);
    return marshaller;
}
@XStreamConverter(value = ToAttributedValueConverter.class, strings = "value")
public abstract class AbstractProp {
    @XStreamAsAttribute
    private final String name;
    private final String value;
}
@XStreamAlias("boolProp")
public class BoolProp extends AbstractProp {
    public BoolProp(String name, Boolean value) {
        super(name, value.toString());
    }
}

EXPECTED <boolProp name =“foobar”> false </ boolProp>

ACTUAL <boolProp name =“foobar”> <value> false </ value> </ boolProp>

Answer 1

好。我在源代码中发现继承有什么问题：

public class ToAttributedValueConverter implements Converter {
...
@Override
public boolean canConvert(final Class<?> type) {
    return this.type == type;
}

所以我把它作为一种解决方法：

public class TextNodeConverter extends ToAttributedValueConverter {

private final Class<?> type;

public TextNodeConverter(Class type, Mapper mapper, ReflectionProvider reflectionProvider, ConverterLookup lookup) {
    this(type, mapper, reflectionProvider, lookup, null, null);
}

public TextNodeConverter(Class type, Mapper mapper, ReflectionProvider reflectionProvider, ConverterLookup lookup,
        String valueFieldName) {
    this(type, mapper, reflectionProvider, lookup, valueFieldName, null);
}

public TextNodeConverter(Class type, Mapper mapper, ReflectionProvider reflectionProvider, ConverterLookup lookup,
        String valueFieldName, Class valueDefinedIn) {
    super(type, mapper, reflectionProvider, lookup, valueFieldName, valueDefinedIn);
    this.type = type;
}

@Override
public boolean canConvert(final Class type) {
    return this.type.isAssignableFrom(type);
}
}

而且，嗯...通勤转换器后，就像一个魅力:-)