如何在运行时以编程方式添加xjc插件？

Question

我正在使用XJC在运行时从xsd生成JAXB类。但是默认情况下，maxLengthxsd中的限制没有注释。

我找到了一个用于处理此问题的插件krasa-jaxb-tools。我已经将依赖项添加到了POM中，但是似乎无法将插件添加到XJC流程中。

我正在使用jaxb-xjc工具的2.2.11版。这是我的依赖项：

<dependency>
    <groupId>com.sun.xml.bind</groupId>
    <artifactId>jaxb-xjc</artifactId>
    <version>2.2.11</version>
</dependency>

<dependency>
    <groupId>com.sun.xml.bind</groupId>
    <artifactId>jaxb-impl</artifactId>
    <version>2.2.11</version>
</dependency>

<dependency>
    <groupId>com.sun.xml.bind</groupId>
    <artifactId>jaxb-core</artifactId>
    <version>2.2.11</version>
</dependency>

<dependency>
    <groupId>com.sun.xml.bind</groupId>
    <artifactId>jaxb-jxc</artifactId>
    <version>2.2.11</version>
</dependency>

<dependency>
    <groupId>com.github.krasa</groupId>
    <artifactId>krasa-jaxb-tools</artifactId>
    <version>1.3</version>
</dependency>

我正在尝试实例化插件，对其进行配置并将其传递给generateCode(Plugins[] extensions, ErrorListener errorListener)我的S2JJAXBModel模型上的方法，但是它似乎没有任何作用。这是我的代码：

SchemaCompiler schemaCompiler = XJC.createSchemaCompiler();
schemaCompiler.forcePackageName(packageRoot);

// JAXB Plugin used to get the proper @Size annotations on all fields.
JaxbValidationsPlugins jaxbValidationPlugin = new JaxbValidationsPlugins();

// Build up list of options for the plugin.
// First option must be the name of the plugin itself.
// Options must be prefixed with dashes
String[] args = new String[] { "-" + JaxbValidationsPlugins.PLUGIN_OPTION_NAME };

try {
    // Activate plugin
    jaxbValidationPlugin.parseArgument(new Options(), args, 0);
} catch (BadCommandLineException | IOException e1) {
    e1.printStackTrace();
}

InputSource inputSource = new InputSource(schemaFile.toURI().toString());

schemaCompiler.parseSchema(inputSource);
S2JJAXBModel model = schemaCompiler.bind();

// Passing the plugin to the method
JCodeModel jCodeModel = model.generateCode(new Plugin[] {jaxbValidationPlugin}, null);

我究竟做错了什么？

Answer 1

这是该#generateCode()方法的实际实现在2.2.11版中的样子

// com.sun.tools.xjc.api.impl.s2j.JAXBModelImpl.java

public JCodeModel generateCode(Plugin[] extensions,ErrorListener errorListener) {
    // we no longer do any code generation
    return outline.getCodeModel();
}

如您所见，参数只是被吞没了。

要添加插件，您要访问中Options找到的插件，然后在其中SchemaCompiler添加插件。另请注意，parseArgument()调用应在选项而不是插件上进行。

这是完成此操作的方法：

SchemaCompiler schemaCompiler = XJC.createSchemaCompiler();
schemaCompiler.forcePackageName(packageRoot);

// JAXB Plugin used to get the proper @Size annotations on all fields.
JaxbValidationsPlugins jaxbValidationPlugin = new JaxbValidationsPlugins();

// Build up list of options for the plugin.
// First option must be the name of the plugin itself.
// Options must be prefixed with dashes
String[] args = new String[] { "-" + JaxbValidationsPlugins.PLUGIN_OPTION_NAME };

// Get the options for the schema compiler, this is where we add plugins.
Options schemaCompilerOptions = ((SchemaCompilerImpl) schemaCompiler).getOptions();
schemaCompilerOptions.getAllPlugins().add(jaxbValidationPlugin);

// Call the parseArgument method on the options, not the plugin
// Passing in zero because we want to parse the first argument in the array
try {
    schemaCompilerOptions.parseArgument(args, 0);
} catch (BadCommandLineException e1) {
    e1.printStackTrace();
}

InputSource inputSource = new InputSource(schemaFile.toURI().toString());
schemaCompiler.parseSchema(inputSource);
S2JJAXBModel model = schemaCompiler.bind();

JCodeModel jCodeModel = model.generateCode(null, null);