如何在 groovy 中编写可写接口

Question

希望使用 groovy 为 Asciidoctor 标记编写 groovy.text.Template。到目前为止：

//-----------------------------------

public class AsciidocTemplate implements groovy.text.Template
{
boolean includeHeaderFooter = true;

Asciidoctor asciidoctor = create();
org.asciidoctor.Options asciidoctorJOptions=["backend": "html","header_footer":includeHeaderFooter]

def payload="";
Map binding = [:]

public AsciidocTemplate()
{
} // end of constructor

public AsciidocTemplate(def payload)
{
    this.payload = payload;
} // end of constructor

// use doctor to transform the template
public Writable process()
{
    def output = asciidoctor.render(this.payload, asciidoctorJOptions);
    Writer ou = output;
    return ou;        
} // end of make

Writable make()
{
    return process();  //output as Writable;
} // end of make

// -----------------------------------

render() 返回一个字符串，我们如何将该字符串转换为实现 Writable 接口的对象，我只是不明白。也看不到如何使用/读取/存储返回的“可写”对象：-P

Answer 1

你可以使用the asWritable method on a Closure来获得一个Writable返回，即：

Writable process()
{
    def output = asciidoctor.render(this.payload, asciidoctorJOptions);
    { w -> w.println output }.asWritable()
}