XJC 生成整数而不是 int

问题描述

以下模式应该在 Value 类中生成两个原始 int 字段，而是为 生成一个原始 int元素和java.lang.Integer 用于属性.

The following schema should be generating two primitive int fields in a Value class, but instead generates a primitive int for the element and java.lang.Integer for the attribute.

<?xml version="1.0" encoding="UTF-8"?>

<xsd:schema version="1.0" xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://www.example.com/test" xmlns:test="http://www.example.com/test"
    elementFormDefault="qualified">

    <xsd:element name="values">
        <xsd:complexType>
            <xsd:sequence minOccurs="0" maxOccurs="unbounded">
                <xsd:element ref="test:value" />
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>

    <xsd:element name="value">
        <xsd:complexType>
            <xsd:sequence>
                <!-- Is generated as primitive int -->
                <xsd:element name="element" type="xsd:int" />
            </xsd:sequence>
            <!-- Is generated as java.lang.Integer -->
            <xsd:attribute name="attribute" type="xsd:int" />
        </xsd:complexType>
    </xsd:element>

</xsd:schema>

我已经浏览了 JAXB 文档 任何说明可以生成属性和元素的内容不同，什么也没发现.

I've looked through the JAXB documentation for anything that says that attributes and elements may be generated differently and found nothing.

谁能解释一下?是否有修复方法可以使属性生成为原始 int?

Can anyone explain this? Is there a fix to make the attribute generate as a primitive int?

推荐答案

我不完全确定这就是答案，但我在调试我的应用程序时顿悟了.

I'm not entirely sure this is the answer, but I had an epiphany while debugging my app.

XML 模式中元素的默认多重性为1..1(必需)，其中属性的默认多重性是 0..1(可选).

The default multiplicity for an element in an XML schema is 1..1 (required) where as the default multiplicity for an attribute is 0..1 (optional).

1. 因此，由于元素是必需的并且Java中的原语具有默认值(很可能是0)，因此生成<xsd:element type="xsd:int"/> 作为 Java 原语.

1. So, since the element is required and a primitive in Java has a default value (most likely 0), it makes sense to generate an <xsd:element type="xsd:int" /> as a Java primitive.

由于属性是可选，所以它可能是nillable，而使用原语是不可能的.java.lang.Integer 是一个 Objectcode>，因此允许为 null，因此生成 <xsd:attribute type="xsd:int"/> 作为 java.lang.Integer.

Since the attribute is optional there is a possibility that it may be nillable which would not be possible using a primitive. The java.lang.Integer is an Object and thus allowed to be null, so it makes sense to generate an <xsd:attribute type="xsd:int" /> as an java.lang.Integer.

如果您将属性设为必需(<xsd:attribute type="xsd:int" use="required"/>code>)，它将生成一个原始的 int.我还没有看到 JAXB 明确说明这一点的文档，但这并不意味着它不存在；也许我只是错过了.

If you make an attribute be required (<xsd:attribute type="xsd:int" use="required" />), it will generate as a primitive int. I haven't seen documentation by JAXB that explicitly says this, but that doesn't mean it doesn't exist; perhaps I just missed it.

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