@Override
@SuppressWarnings("deprecation")
public Object getValue(ELContext context, Object base, Object property) throws ELException {
// Don't call into the chain unless it's been decorated.
if (legacyVR instanceof ChainAwareVariableResolver) {
return null;
}
if (base != null) {
return null;
}
if (base == null && property == null) {
String message =
MessageUtils.getExceptionMessageString(
MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "base and property"); // ?????
throw new PropertyNotFoundException(message);
}
context.setPropertyResolved(true);
Object result = null;
FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class);
String propString = property.toString();
Map<String, Object> stateMap = RequestStateManager.getStateMap(facesContext);
try {
// If we are already in the midst of an expression evaluation
// that touched this resolver...
//noinspection unchecked
List<String> varNames = (List<String>) stateMap.get(RequestStateManager.REENTRANT_GUARD);
if (varNames != null && !varNames.isEmpty() && varNames.contains(propString)) {
// take no action and return.
context.setPropertyResolved(false);
return null;
}
// Make sure subsequent calls don't take action.
if (varNames == null) {
varNames = new ArrayList<>();
stateMap.put(RequestStateManager.REENTRANT_GUARD, varNames);
}
varNames.add(propString);
result = legacyVR.resolveVariable(facesContext, propString);
} catch (EvaluationException ex) {
context.setPropertyResolved(false);
throw new ELException(ex);
} finally {
// Make sure to remove the guard after the call returns
//noinspection unchecked
List<String> varNames = (List<String>) stateMap.get(RequestStateManager.REENTRANT_GUARD);
if (varNames != null && !varNames.isEmpty()) {
varNames.remove(propString);
}
// Make sure that the ELContext "resolved" indicator is set
// in accordance wth the result of the resolution.
context.setPropertyResolved(result != null);
}
return result;
}
