# Generator

> ## GWT Generator \#
>
> 環境：GWT 2.6、Maven、SDM

## 前置準備

`pom.xml` 要多加上（一般的 GWT 開發不需要這個 dependency）：

com.google.gwtgwt-devprovided

假設 interface 叫做 `FooBinder`（GWT 官方似乎喜歡用 binder 結尾）， 則需要一個 extends `Generator` 的 class，假設叫做 `FooBinderGenerator`， 然後 `gwt.xml` 要加上：

```
<generate-with class="PKG_NAME.FooBinderGenerator">
    <when-type-assignable class="PKG_NAME.FooBinder"/>
</generate-with>
```

## 撰寫 tip

* 修改 generator 必須重新啟動 code server 才會執行新的版本。
* 可以使用 `System.out.println()`，也可以用 `generate()` 傳入的 `TreeLogger` 參數，

  &#x20; 都會出現在 console 中。

## Reference

* <http://www.gwtproject.org/doc/latest/DevGuideCodingBasicsDeferred.html>
* <http://christiangoudreau.wordpress.com/2013/05/06/how-to-efficiently-write-gwt-generators/>


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