Jaxb：为固定值属性生成常量值 [英] Jaxb: Generate constant value for fixed-value attribute

问题描述

我目前正在使用xsd，它使用以下结构：

I'm currently working on a xsd which uses the following contruct:

<xs:attribute name="listVersionID" type="xs:normalizedString" use="required" fixed="1.0">

虽然本身没有问题，但使用起来相当烦人，因为这是固定值xsd规范版本之间的定义增加，我们需要修改单独的常量类中的值以使它们保持有效，尽管xsd中任何感兴趣的内容都没有改变。 xsd在其他地方维护，所以只是改变它是没有选择的。

While not problematic per se, it is rather annoying to work with, since the fixed-value of this definition increases between releases of the xsd spec, and we need to modify the values in a seperate constants-class to keep them valid, although little if anything of interest in the xsd has changed. The xsd is maintained elsewhere, so just changing it is no option.

因此我问自己是否有一个jaxb-plugin或类似的将固定值属性变为常量ala

Thus I was asking myself wether there is a jaxb-plugin or similar to turn fixed-value attributes into constants ala

@XmlAttribute(name = "listVersionID")
@XmlJavaTypeAdapter(NormalizedStringAdapter.class)
@XmlSchemaType(name = "normalizedString")
protected final String listVersionID = "1.0";

而不仅仅是

@XmlAttribute(name = "listVersionID")
@XmlJavaTypeAdapter(NormalizedStringAdapter.class)
@XmlSchemaType(name = "normalizedString")
protected String listVersionID;

必须手动填充。

有没有人知道这样的？

推荐答案

如果你不想修改架构，另一个选择是使用外部绑定文件：

If you don't want to modify your schema, another option is to use an external binding file:

<?xml version="1.0" encoding="UTF-8"?>
<jaxb:bindings xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"
    version="2.0"
    xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <jaxb:bindings schemaLocation="yourschema.xsd" node="/xs:schema">
    <jaxb:globalBindings fixedAttributeAsConstantProperty="true" />
  </jaxb:bindings>

</jaxb:bindings>

这相当于@jmattheis在答案中的建议。

It is equivalent to what proposes @jmattheis in his answer.

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