JAXB - 属性“值"；已经定义了.使用 <jaxb:property>解决这个冲突

2022-01-09 00:00:00 xsd java jaxb

使用 JAXB 生成 XML 绑定类.

Using JAXB to generate XML binding classes.

架构基于一组旧版 XML 文件，并包含以下代码段:

The schema is based on a set of legacy XML files, and includes this snippet:

<xs:complexType name="MetaType">
    <xs:simpleContent>
        <xs:extension base="xs:string">
            <xs:attribute type="xs:string" name="Name" />
            <xs:attribute type="xs:string" name="Scheme" />
            <xs:attribute type="xs:string" name="Value" />
        </xs:extension>
    </xs:simpleContent>
</xs:complexType>

'Value'属性与xs:string的'value'属性冲突，代码生成失败，报错:

The 'Value' attribute conflicts with the 'value' property of xs:string, and the code generation fails with the error:

com.sun.istack.SAXParseException2: Property "Value" is already defined. Use &lt;jaxb:property> to resolve this conflict.

推荐答案

答案在于利用 JAXB 绑定(site-template.xjb):

The answer lies in making use of JAXB bindings (site-template.xjb):

<bindings xmlns="http://java.sun.com/xml/ns/jaxb"
          xmlns:xsi="http://www.w3.org/2000/10/XMLSchema-instance"
          xmlns:xs="http://www.w3.org/2001/XMLSchema"
          version="2.1">
    <bindings schemaLocation="site-template.xsd" version="1.0">
        <!-- Customise the package name -->
        <schemaBindings>
            <package name="com.example.schema"/>
        </schemaBindings>

        <!-- rename the value element -->
        <bindings node="//xs:complexType[@name='MetaType']">
            <bindings node=".//xs:attribute[@name='Value']">
                <property name="ValueAttribute"/>
            </bindings>
        </bindings>
    </bindings>
</bindings>

XPath 表达式定位节点并对其进行重命名，从而避免命名冲突.

The XPath expressions locate the nodes and renames it, thereby avoiding the naming conflict.

使用此绑定 XML 文件，生成的 Java 类最终具有所需的 getValueAttribute()(以及 getValue()).

Using this bindings XML file, the generated Java class ends up having the desired getValueAttribute() (as well as the getValue()).

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