Example usage for javax.xml.xpath XPathVariableResolver XPathVariableResolver

Introduction

In this page you can find the example usage for javax.xml.xpath XPathVariableResolver XPathVariableResolver.

Prototype

XPathVariableResolver

Source Link

Usage

From source file:org.jasig.springframework.security.portlet.authentication.PortletXmlMappableAttributesRetriever.java

/**
 * Loads the portlet.xml file using the configured <tt>ResourceLoader</tt> and
 * parses the role-name elements from it, using these as the set of <tt>mappableAttributes</tt>.
 *//*  www  .j  av  a2s .  c  om*/
public void afterPropertiesSet() throws Exception {
    Resource portletXml = resourceLoader.getResource("/WEB-INF/portlet.xml");
    Document doc = getDocument(portletXml.getInputStream());

    final XPathExpression roleNamesExpression;
    if (portletConfig == null) {
        final XPathFactory xPathFactory = XPathFactory.newInstance();

        final XPath xPath = xPathFactory.newXPath();
        roleNamesExpression = xPath.compile("/portlet-app/portlet/security-role-ref/role-name");
    } else {
        final XPathFactory xPathFactory = XPathFactory.newInstance();
        xPathFactory.setXPathVariableResolver(new XPathVariableResolver() {
            @Override
            public Object resolveVariable(QName variableName) {
                if ("portletName".equals(variableName.getLocalPart())) {
                    return portletConfig.getPortletName();
                }

                return null;
            }
        });
        final XPath xPath = xPathFactory.newXPath();
        roleNamesExpression = xPath
                .compile("/portlet-app/portlet[portlet-name=$portletName]/security-role-ref/role-name");
    }

    final NodeList securityRoles = (NodeList) roleNamesExpression.evaluate(doc, XPathConstants.NODESET);
    final Set<String> roleNames = new HashSet<String>();

    for (int i = 0; i < securityRoles.getLength(); i++) {
        Element secRoleElt = (Element) securityRoles.item(i);
        String roleName = secRoleElt.getTextContent().trim();
        roleNames.add(roleName);
        logger.info("Retrieved role-name '" + roleName + "' from portlet.xml");
    }

    if (roleNames.isEmpty()) {
        logger.info("No security-role-ref elements found in " + portletXml
                + (portletConfig == null ? "" : " for portlet " + portletConfig.getPortletName()));
    }

    mappableAttributes = Collections.unmodifiableSet(roleNames);
}

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