Freemarker：嵌套模板

Question

I am a beginner with freemarker and I would like to use it to generate some repetitive code.

From a simple class like this one:

public class Point {
  private Integer x;
  private Integer y;
  private String name;
}

I need, for each attribute, to generate lines like this:

ValueProvider<Point,Integer> x();
ValueProvider<Point,Integer> y();
ValueProvider<Point,String> name();

To achieve this, I have this simple template :

ValueProvider<${clazz},${attrType}> ${attrName}();

Then, I want to generate a complete class like this:

public final class PointValueProviders {

  public interface PointPropertyAccess extends PropertyAccess<Point>{
    ValueProvider<Point,Integer> x();
    ValueProvider<Point,Integer> y();
    ValueProvider<Point,String> name();
  }

  public static final PointPropertyAccess POINT_PA= GWT.create(PointPropertyAccess.class);

  private PointValueProviders(){}

};

For this, I have a problem : I don't know how to apply the small templates an undetermined number of times in a bigger template like this one:

public final ${clazz}ValueProviders {

  public interface ${clazz}PropertyAccess extends PropertyAccess<${clazz}>{

  //Here, How do I tell freemarker to use the small template???

  //ValueProvider<${clazz},${attrType}> ${attrName}();
  //ValueProvider<${clazz},${attrType}> ${attrName}();
  //ValueProvider<${clazz},${attrType}> ${attrName}();
  //ValueProvider<${clazz},${attrType}> ${attrName}();
  //etc..

  }

  public static final ${clazz}PropertyAccess ${clazzUpperCase}_PA= GWT.create(${clazz}PropertyAccess.class);

  private ${clazz}ValueProviders(){}

};

Any idea?

Answer 1

Templates are to display some data that you provide to them. So the important question is, how would the template know what class / attrType / attrName trios to output? You should provide a list of those, let's call it props , and then just loop through it with

<#list props as prop>
   ValueProvider<${prop.clazz},${prop.attrType}> ${prop.attrName}();
</#list>

Otherwise to create small reusable templates either use #macro (this one is the more flexible) or #include . See them in the FreeMarker Manual .