Include(Template template,
    Expression includedTemplateName,
    Expression encodingExp,
    Expression parseExp) throws ParseException 
{
        String templatePath1 = template.getName();
        int lastSlash = templatePath1.lastIndexOf('/");
        templatePath = lastSlash == -1 ? "" : templatePath1.substring(0, lastSlash + 1);
        this.includedTemplateName = includedTemplateName;
        if (encodingExp instanceof StringLiteral) {
            encoding = encodingExp.toString();
            encoding = encoding.substring(1, encoding.length() -1);
        }
        else {
            this.encodingExp = encodingExp;
        }
        if(parseExp == null) {
            parse = true;
        }
        else if(parseExp.isLiteral()) {
            try {
                if (parseExp instanceof StringLiteral) {
                    parse = StringUtil.getYesNo(parseExp.getStringValue(null));
                }
                else {
                    try {
                        parse = parseExp.isTrue(null);
                    }
                    catch(NonBooleanException e) {
                        throw new ParseException("Expected a boolean or string as the value of the parse attribute", parseExp);
                    }
                }
            }
            catch(TemplateException e) {
                // evaluation of literals must not throw a TemplateException
                throw new UndeclaredThrowableException(e);
            }
        }
        else {
            this.parseExp = parseExp;
        }
}

Parameters:

template - the template that this Include is a part of.

includedTemplateName - the name of the template to be included.

encodingExp - the encoding to be used or null, if it is a default.

parseExp - whether the template should be parsed (or is raw text)

  void accept(Environment env) throws IOException, TemplateException 
{
        String templateNameString = includedTemplateName.getStringValue(env);
        if( templateNameString == null ) {
            String msg = "Error " + getStartLocation()
                        + "The expression " + includedTemplateName + " is undefined.";
            throw new InvalidReferenceException(msg, env);
        }
        String enc = encoding;
        if (encoding == null && encodingExp != null) {
            enc = encodingExp.getStringValue(env);
        }
        boolean parse = this.parse;
        if (parseExp != null) {
            TemplateModel tm = parseExp.getAsTemplateModel(env);
            if(tm == null) {
                if(env.isClassicCompatible()) {
                    parse = false;
                }
                else {
                    assertNonNull(tm, parseExp, env);
                }
            }
            if (tm instanceof TemplateScalarModel) {
                parse = getYesNo(EvaluationUtil.getString((TemplateScalarModel)tm, parseExp, env));
            }
            else {
                parse = parseExp.isTrue(env);
            }
        }
        Template includedTemplate;
        try {
            templateNameString = TemplateCache.getFullTemplatePath(env, templatePath, templateNameString);
            includedTemplate = env.getTemplateForInclusion(templateNameString, enc, parse);
        }
        catch (ParseException pe) {
            String msg = "Error parsing included template "
                        + templateNameString  + "\n" + pe.getMessage();
            throw new TemplateException(msg, pe, env);
        }
        catch (IOException ioe) {
            String msg = "Error reading included file "
                        + templateNameString;
            throw new TemplateException(msg, ioe, env);
        }
        env.include(includedTemplate);
}

 public String getCanonicalForm() 
{
        StringBuffer buf = new StringBuffer("< #include ");
        buf.append(includedTemplateName);
        if (encoding != null) {
            buf.append(" encoding=\"");
            buf.append(encodingExp.getCanonicalForm());
            buf.append("\"");
        }
        if(parseExp != null) {
            buf.append(" parse=" + parseExp.getCanonicalForm());
        }
        else if (!parse) {
            buf.append(" parse=false");
        }
        buf.append("/ >");
        return buf.toString();
}

 public String getDescription() 
{
        return "include " + includedTemplateName;
}