无法应用@XStreamConverter ToAttributedValueConverter

Question

我想要一些 XML 树 classes 解组为文本节点，但在我的用例中无法正常工作：一个抽象的 class 层次结构。

我尝试以编程方式注册转换器，以在具体的 classes 上声明它（API 文档甚至说已处理继承的字段）。

@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());
    }
}

预期 false

ACTUAL false

Answer 1

好的。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;
}

所以我做了这个作为解决方法：

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，好吧......在转换转换器之后，它就像一个魅力:-)

无法应用@XStreamConverter ToAttributedValueConverter

Cannot apply @XStreamConverter ToAttributedValueConverter

xml

xstream

marshalling

unmarshalling