Method generateXmlProlog

java/org/apache/jasper/compiler/Generator.java:825–859

Generates an XML Prolog, which includes an XML declaration and an XML doctype declaration.

(Node.Nodes page)

     * Generates an XML Prolog, which includes an XML declaration and an XML doctype declaration.
     */
    private void generateXmlProlog(Node.Nodes page) {

        /*
         * An XML declaration is generated under the following conditions: a) 'omit-xml-declaration' attribute of
         * <jsp:output> action is set to "no" or "false"; b) JSP document without a <jsp:root>.
         */
        String omitXmlDecl = pageInfo.getOmitXmlDecl();
        if ((omitXmlDecl != null && !JspUtil.booleanValue(omitXmlDecl)) ||
                (omitXmlDecl == null && page.getRoot().isXmlSyntax() && !pageInfo.hasJspRoot() && !ctxt.isTagFile())) {
            String cType = pageInfo.getContentType();
            String charSet = cType.substring(cType.indexOf("charset=") + 8);
            out.printil("out.write(\"<?xml version=\\\"1.0\\\" encoding=\\\"" + charSet + "\\\"?>\\n\");");
        }

        /*
         * Output a DOCTYPE declaration if the doctype-root-element appears. If doctype-public appears: <!DOCTYPE name
         * PUBLIC "doctypePublic" "doctypeSystem"> else <!DOCTYPE name SYSTEM "doctypeSystem" >
         */
        String doctypeName = pageInfo.getDoctypeName();
        if (doctypeName != null) {
            String doctypePublic = pageInfo.getDoctypePublic();
            String doctypeSystem = pageInfo.getDoctypeSystem();
            out.printin("out.write(\"<!DOCTYPE ");
            out.print(doctypeName);
            if (doctypePublic == null) {
                out.print(" SYSTEM \\\"");
            } else {
                out.print(" PUBLIC \\\"");
                out.print(doctypePublic);
                out.print("\\\" \\\"");
            }
            out.print(doctypeSystem);
            out.println("\\\">\\n\");");
        }
    }

    /**
     * A visitor that generates codes for the elements in the page.