jaxb - 使用 JAXB 和 moxy 自定义枚举编码

Question

我在使用 Moxy 和 JSON 进行自定义枚举编码(marshal)处理时遇到一些问题。我的用例是，我有一个大型对象模型，其中包含通常应提供正常枚举值、“代码”和描述的枚举。该数据的来源只有“代码”，因此我需要能够仅使用代码来解码​​这些枚举的实例(例如

{"companyCode":{"code":"PI"}}。

但是，我还应该能够编码和解码所有三个字段:

{"companyCode":
  {"value":"Private",
  "code":"PI","description":
  "Private Ins"
  }
}

我使用的适配器如下所示:

public class CodeEnumXmlAdapter<E extends Enum<E> & CodeEnum> extends XmlAdapter<CodeEnumImpl,E> {

    public static <T extends Enum<T> & CodeEnum> T getFromName(Class<T> clazz, String name) {
        if (name == null) return null;

        T[] values = clazz.getEnumConstants();

        for (T t : values) {
            if (name.equals(t.name())) {
                return t;
            }
        }

        return null;
    }
    public static <T extends Enum<T> & CodeEnum> T getFromCode(Class<T> clazz, String code) {
        if (code == null) return null;

        T[] values = clazz.getEnumConstants();

        for (T t : values) {
            if (code.equals(t.getCode())) {
                return t;
            }
        }

        return null;
    }
    public static <T extends Enum<T> & CodeEnum> T getFromString(Class<T> clazz, String aString) {
        if (aString == null) return null;

        T[] values = clazz.getEnumConstants();

        for (T t : values) {
            if (aString.equals(t.getCode()) || aString.equals(t.name()) || aString.equals(t.getDescription())) {
                return t;
            }
        }

        return null;
    }

    @Override
    public E unmarshal(CodeEnumImpl value) throws Exception {
        if (value == null) return null;

        String valueString = value.getValue();
        if (valueString == null)
            valueString = value.getCode();
        if (valueString == null)
            valueString = value.getDescription();
        if (valueString == null)
            return null;

        Type generic = ((ParameterizedType)getClass().getGenericSuperclass()).getActualTypeArguments()[0];
        return getFromString((Class<E>)generic, valueString);
    }

    @Override
    public CodeEnumImpl marshal(E value) throws Exception {
        return value == null ? null : new CodeEnumImpl(value);
    }
}

这从一个枚举转换而来，如下所示:

import org.apache.commons.lang3.StringUtils;

import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

@XmlJavaTypeAdapter(CompanyCode.Adapter.class)
public enum CompanyCode implements CodeEnum {

    // Changed "Commmercial" to "Client" based on inputs from ...Greg, Tamil
    Client("CM", "Client"), Medicare("MC", "Medicare"), Medicaid("MD",
            "Medicaid"), Private("PI", "Private Ins"), Patient("PT", "Patient");

    private String code;
    private String description;

    private CompanyCode(String code, String label) {
        this.code = code;
        this.description = label;
    }

    public String getDescription() {
        return description;
    }

    public String getCode() {
        return code;
    }

    public static CompanyCode fromCode(String code) {
        if (StringUtils.isEmpty(code)) {
            return null;
        }

        for (CompanyCode freq : values()) {
            if (freq.getCode().equalsIgnoreCase(code)) {
                return freq;
            }
        }
        throw new IllegalArgumentException("Invalid CompanyCode code: " + code);
    }

    public String toString() {
        return description;
    }

    public static class Adapter extends CodeEnumXmlAdapter<CompanyCode> {}
}

并使用这样的中间类型:

import javax.xml.bind.annotation.XmlElement;

/**
 * Created by Jeffrey Hoffman on 6/24/2015.
 */
public class CodeEnumImpl  {
    String value;
    String description;
    String code;

    public CodeEnumImpl() {

    }
    public <E extends Enum<E> & CodeEnum> CodeEnumImpl(E value) {
        if (value != null) {
            this.value = value.name();
            this.description = value.getDescription();
            this.code = value.getCode();
        }
    }

    @XmlElement
    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    @XmlElement
    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    @XmlElement
    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    @Override
    public String toString() {
        return value == null ? null : value.toString();
    }
}

这对于直接 XML 和 JAXB 来说工作得很好。但是，当我尝试使用 Moxy 时，我收到如下异常:

Exception Description: The object [Private Ins], of class [class com.labcorp.phoenix.biz.enums.CompanyCode], could not be converted to [class java.lang.Object]. Internal Exception: Exception [EclipseLink-115] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DescriptorException Exception Description: No conversion value provided for the attribute [Private]. Mapping: org.eclipse.persistence.oxm.mappings.XMLDirectMapping[companyCode-->companyCode/text()] Descriptor: XMLDescriptor(com.labcorp.phoenix.eligibility.Root --> [DatabaseTable(root)]) at org.eclipse.persistence.exceptions.ConversionException.couldNotBeConverted(ConversionException.java:87) at org.eclipse.persistence.internal.jaxb.XMLJavaTypeConverter.convertObjectValueToDataValue(XMLJavaTypeConverter.java:178) at org.eclipse.persistence.oxm.mappings.XMLDirectMapping.convertObjectValueToDataValue(XMLDirectMapping.java:511) at org.eclipse.persistence.oxm.mappings.XMLDirectMapping.getFieldValue(XMLDirectMapping.java:330) at org.eclipse.persistence.internal.oxm.XMLDirectMappingNodeValue.marshalSingleValue(XMLDirectMappingNodeValue.java:62) at org.eclipse.persistence.internal.oxm.XMLDirectMappingNodeValue.marshal(XMLDirectMappingNodeValue.java:58) at org.eclipse.persistence.internal.oxm.NodeValue.marshal(NodeValue.java:102) at org.eclipse.persistence.internal.oxm.record.ObjectMarshalContext.marshal(ObjectMarshalContext.java:59) at org.eclipse.persistence.internal.oxm.XPathNode.marshal(XPathNode.java:393) at org.eclipse.persistence.internal.oxm.XPathNode.marshal(XPathNode.java:368) at org.eclipse.persistence.internal.oxm.XPathObjectBuilder.buildRow(XPathObjectBuilder.java:238) at org.eclipse.persistence.internal.oxm.TreeObjectBuilder.buildRow(TreeObjectBuilder.java:118) at org.eclipse.persistence.internal.oxm.TreeObjectBuilder.buildRow(TreeObjectBuilder.java:1) at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:743) at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:1124) at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:869) ... 7 more Caused by: Exception [EclipseLink-115] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DescriptorException

这似乎是 moxy 中的一个错误，因为我的适配器转换为非枚举类型，因此不应该有处理枚举的nestedConverter。

Answer 1

我成功地用 2.5.0 重现了您的问题。这很可能是已经修复的错误。无法在 Eclipse Bugzilla 中找到该错误，但相同的代码在 2.6.0 中可以正常工作。您能升级到最新的 MOXy 吗？