如何在FreeMarker模板中访问root bean？

Question

我花了一些时间试图在文档中识别出这个"特殊变量".我有一个案例,我希望能够将根哈希传递给一个可以对其进行操作的宏.我发现了对Environment.getCurrentEnvironment()的引用,但它在Java中不是模板.如何将根数据模型传递给宏？

Answer 1

下面是一个成功完成我所追求的单元测试.关键是'.data_model'变量.

public class TestFreeMarkerTemplating {

Configuration cfg = new Configuration();
StringTemplateLoader stringLoader = new StringTemplateLoader();
{ cfg.setTemplateLoader(stringLoader);
cfg.setObjectWrapper(new BeansWrapper()); }

@Test
public void testTestableMacros() throws TemplateException, IOException{
    stringLoader.putTemplate("root", "<#macro user testPojo>Welcome ${testPojo.user}. <@subPojo sub/></#macro><#macro subPojo sub>Sub ${sub.user}!</#macro>");
    stringLoader.putTemplate("testPojoTemplate", "<#import \"root\" as w><@w.user .data_model/>");
    stringLoader.putTemplate("testSubPojoTemplate", "<#import \"root\" as w><@w.subPojo .data_model/>");
    assertTemplateAndBeanYield("root", new TestPojo(), "");
    assertTemplateAndBeanYield("testPojoTemplate", new TestPojo(), "Welcome Andy. Sub Bill!");
    assertTemplateAndBeanYield("testSubPojoTemplate", new SubPojo(), "Sub Bill!");

}

public void assertTemplateAndBeanYield(String templateName, Object bean, String expectedOutput) throws IOException, TemplateException{
    Template temp = cfg.getTemplate(templateName);
    StringWriter out = new StringWriter();
    temp.process(bean, out);

    assertEquals(expectedOutput, out.toString());
}

public static class TestPojo {
    private final String user = "Andy";
    private final SubPojo sub = new SubPojo();

    public String getUser() { return user; }
    public SubPojo getSub() { return sub; }
}

public static class SubPojo {
    private final String user = "Bill";

    public String getUser() { return user; }
}
}