Render Mustache-templates in Java with Hogan.js

HoganGenerator.java

import org.mozilla.javascript.*;
import org.apache.commons.io.IOUtils;

import java.io.*;

public class HoganGenerator {
  private StringBuilder parseFile(GeneratorContext context, String file) throws IOException {
    StringBuilder javaScriptString = new StringBuilder();
    String variableName = String.format("template['%s']", file);

    Context cx = Context.enter();
    try {
        ScriptableObject scope = cx.initStandardObjects();

        Reader hoganJs = new InputStreamReader(this.getClass().getResourceAsStream("hogan-2.0.0.js"));
        cx.evaluateReader(scope, hoganJs, "hogan.js", 1, null);

        Function compile = cx.compileFunction(scope, "function(source) {return Hogan.compile(source, { asString: true })}", "compile_template.js", 1, null);

        InputStream templateStream = context.getServletContext().getResourceAsStream(file);
        String templateString = IOUtils.toString(templateStream, "UTF-8");

        Object template = compile.call(cx, scope, scope, new Object[]{templateString});

        return javaScriptString.append(variableName).append(" = ").append(template.toString()).append(";");
    }
    catch (IOException e) {
        throw new RuntimeException(e);
    }
    finally {
        Context.exit();
    }
}