simple_group_example - StringTemplate

This quick example will illustrate how to use string groups. So that you can be up and running as quick as possible.

Create the string tempate group file called te.stg as below. .stg is an extension commonly used for files of string template groups.

group groupName;

typeInitMap ::= [
   "Integer":  "0",
    "long":    "1",
    default:   "null"
]
variable(type,name) ::= <<
   <b>$type$</b> $name$ = $typeInitMap.(type)$;$\n$
>>

A simple java program to use this template group would look as follows:

import java.io.File;
import java.io.FileReader;

import org.antlr.stringtemplate.StringTemplate;
import org.antlr.stringtemplate.StringTemplateGroup;
import org.antlr.stringtemplate.language.DefaultTemplateLexer;

public class t {
    /* Quick and very nasty example: */
    public static void main(String[] args)
       throws Exception
    {
        File templateFileName = new File("te.stg");
        StringTemplateGroup group = new StringTemplateGroup(
                new FileReader(templateFileName),
                DefaultTemplateLexer.class    // Leave away if you want to use angle brace notation
            );

        StringTemplate template = group.getInstanceOf("variable");

        template.setAttribute("type", "Integer");
        template.setAttribute("name", "id");

        System.out.println(template.toString());
    }
}

And the output should look as follows:

<b>Integer</b> ID = 0;¶