This is the template for the Director.

director.tmpl

package main 

type director struct { 
    builder iBuilder 
} 

func newDirector(b iBuilder) *director { 
    return &director{ 
        builder: b, 
    } 
} 

func (d *director) setBuilder(b iBuilder) { 
    d.builder = b 
} 

func (d *director) build{{title .ProductTarget}}() {{.ProductTarget}} { 
{{range .Properties -}} 
    d.builder.set{{if eq .TypeName `int`}}Num{{end}}{{title .Name}}() 
{{end -}} 
    return d.builder.get{{title .ProductTarget}}() 
}