XPathSupport getXPathSupport() {
if (jaxenXPathSupport != null) {
return jaxenXPathSupport;
}
XPathSupport xps = null;
Document doc = node.getOwnerDocument();
if (doc == null) {
doc = (Document) node;
}
synchronized (doc) {
WeakReference ref = (WeakReference) xpathSupportMap.get(doc);
if (ref != null) {
xps = (XPathSupport) ref.get();
}
if (xps == null) {
try {
xps = (XPathSupport) xpathSupportClass.newInstance();
xpathSupportMap.put(doc, new WeakReference(xps));
} catch (Exception e) {
logger.error("Error instantiating xpathSupport class", e);
}
}
}
return xps;
}
@SuppressWarnings("unchecked")
Object getPrincipalFromClassName(Map params) {
String type = this.getType(params);
try {
Class cls = Class.forName(type);
return getSubject().getPrincipals().oneByType(cls);
} catch (ClassNotFoundException ex) {
log.error("Unable to find class for name [" + type + "]", ex);
}
return null;
}
private static ExpressionFactory tryExpressionFactoryImplementation(String packagePrefix) {
String className = packagePrefix + ".el.ExpressionFactoryImpl";
try {
Class cl = ClassUtil.forName(className);
if (ExpressionFactory.class.isAssignableFrom(cl)) {
logger.info(
"Using " + className + " as implementation of " + ExpressionFactory.class.getName());
return (ExpressionFactory) cl.newInstance();
}
logger.warn(
"Class " + className + " does not implement " + ExpressionFactory.class.getName());
} catch (ClassNotFoundException e) {
} catch (Exception e) {
logger.error("Failed to instantiate " + className, e);
}
return null;
}