FileDocCategorySizeDatePackage
Validator.javaAPI DocApache Tomcat 6.0.1481809Fri Jul 20 04:20:36 BST 2007org.apache.jasper.compiler

Validator

public class Validator extends Object
Performs validation on the page elements. Attributes are checked for mandatory presence, entry value validity, and consistency. As a side effect, some page global value (such as those from page direcitves) are stored, for later use.
author
Kin-man Chung
author
Jan Luehe
author
Shawn Bayern
author
Mark Roth

Fields Summary
Constructors Summary
Methods Summary
public static voidvalidate(Compiler compiler, Node.Nodes page)


        /*
         * Visit the page/tag directives first, as they are global to the page
         * and are position independent.
         */
        page.visit(new DirectiveVisitor(compiler));

        // Determine the default output content type
        PageInfo pageInfo = compiler.getPageInfo();
        String contentType = pageInfo.getContentType();

        if (contentType == null || contentType.indexOf("charset=") < 0) {
            boolean isXml = page.getRoot().isXmlSyntax();
            String defaultType;
            if (contentType == null) {
                defaultType = isXml ? "text/xml" : "text/html";
            } else {
                defaultType = contentType;
            }

            String charset = null;
            if (isXml) {
                charset = "UTF-8";
            } else {
                if (!page.getRoot().isDefaultPageEncoding()) {
                    charset = page.getRoot().getPageEncoding();
                }
            }

            if (charset != null) {
                pageInfo.setContentType(defaultType + ";charset=" + charset);
            } else {
                pageInfo.setContentType(defaultType);
            }
        }

        /*
         * Validate all other nodes. This validation step includes checking a
         * custom tag's mandatory and optional attributes against information in
         * the TLD (first validation step for custom tags according to
         * JSP.10.5).
         */
        page.visit(new ValidateVisitor(compiler));

        /*
         * Invoke TagLibraryValidator classes of all imported tags (second
         * validation step for custom tags according to JSP.10.5).
         */
        validateXmlView(new PageDataImpl(page, compiler), compiler);

        /*
         * Invoke TagExtraInfo method isValid() for all imported tags (third
         * validation step for custom tags according to JSP.10.5).
         */
        page.visit(new TagExtraInfoVisitor(compiler));
private static voidvalidateXmlView(javax.servlet.jsp.tagext.PageData xmlView, Compiler compiler)
Validate XML view against the TagLibraryValidator classes of all imported tag libraries.


        StringBuffer errMsg = null;
        ErrorDispatcher errDisp = compiler.getErrorDispatcher();

        for (Iterator iter = compiler.getPageInfo().getTaglibs().iterator(); iter
                .hasNext();) {

            Object o = iter.next();
            if (!(o instanceof TagLibraryInfoImpl))
                continue;
            TagLibraryInfoImpl tli = (TagLibraryInfoImpl) o;

            ValidationMessage[] errors = tli.validate(xmlView);
            if ((errors != null) && (errors.length != 0)) {
                if (errMsg == null) {
                    errMsg = new StringBuffer();
                }
                errMsg.append("<h3>");
                errMsg.append(Localizer.getMessage(
                        "jsp.error.tlv.invalid.page", tli.getShortName(),
                        compiler.getPageInfo().getJspFile()));
                errMsg.append("</h3>");
                for (int i = 0; i < errors.length; i++) {
                    if (errors[i] != null) {
                        errMsg.append("<p>");
                        errMsg.append(errors[i].getId());
                        errMsg.append(": ");
                        errMsg.append(errors[i].getMessage());
                        errMsg.append("</p>");
                    }
                }
            }
        }

        if (errMsg != null) {
            errDisp.jspError(errMsg.toString());
        }