/**
* Tries to find attribute values based on the given selector data. The result, if successful,
* must always contain a <code>BagAttribute</code>, even if only one value was found. If no values
* were found, but no other error occurred, an empty bag is returned.
*
* @param contextPath the XPath expression to search against
* @param attributeType the datatype of the attributes to find
* @param context the representation of the request data
* @param xpathVersion the XPath version to use
* @return the result of attribute retrieval, which will be a bag of attributes or an error
*/
public EvaluationResult findAttribute(
String contextPath, URI attributeType, EvaluationCtx context, String xpathVersion) {
Iterator it = selectorModules.iterator();
// go through each module in order
while (it.hasNext()) {
AttributeFinderModule module = (AttributeFinderModule) (it.next());
// see if the module can find an attribute value
EvaluationResult result =
module.findAttribute(contextPath, attributeType, null, null, context, xpathVersion);
// if there was an error, we stop right away
if (result.indeterminate()) {
logger.info("Error while trying to resolve values: " + result.getStatus().getMessage());
return result;
}
// if the result wasn't empty, then return the result
BagAttribute bag = (BagAttribute) (result.getAttributeValue());
if (!bag.isEmpty()) return result;
}
// if we got here then there were no errors but there were also no
// matches, so we have to return an empty bag
logger.info("Failed to resolve any values for " + contextPath);
try {
throw new Exception();
} catch (Exception ex) {
ex.printStackTrace();
}
return new EvaluationResult(BagAttribute.createEmptyBag(attributeType));
}
/**
* Tries to find attribute values based on the given designator data. The result, if successful,
* will always contain a <code>BagAttribute</code>, even if only one value was found. If no values
* were found, but no other error occurred, an empty bag is returned.
*
* @param attributeType the datatype of the attributes to find
* @param attributeId the identifier of the attributes to find
* @param issuer the issuer of the attributes, or null if unspecified
* @param category the category of the attribute if the designatorType is SUBJECT_TARGET,
* otherwise null
* @param context the representation of the request data
* @return the result of attribute retrieval, which will be a bag of attributes or an error
*/
public EvaluationResult findAttribute(
URI attributeType, URI attributeId, String issuer, URI category, EvaluationCtx context) {
Iterator it = designatorModules.iterator();
logger.debug("Selector modules size ==> " + selectorModules.size());
// go through each module in order
while (it.hasNext()) {
AttributeFinderModule module = (AttributeFinderModule) (it.next());
// see if the module supports this type
// see if the module can find an attribute value
logger.info(
"Attribute Type => "
+ attributeType
+ " attributeId =>"
+ attributeId
+ " issuer => "
+ issuer
+ " Category => "
+ category
+ " Context => "
+ context);
EvaluationResult result =
module.findAttribute(attributeType, attributeId, issuer, category, context);
// if there was an error, we stop right away
if (result.indeterminate()) {
logger.error("Error while trying to resolve values: " + result.getStatus().getMessage());
return result;
}
// if the result wasn't empty, then return the result
BagAttribute bag = (BagAttribute) (result.getAttributeValue());
if (!bag.isEmpty()) return result;
}
// if we got here then there were no errors but there were also no
// matches, so we have to return an empty bag
logger.debug("Failed to resolve any values for " + attributeId.toString());
/*
try {
throw new Exception();
} catch (Exception ex) {
ex.printStackTrace();
}
*/
return new EvaluationResult(BagAttribute.createEmptyBag(attributeType));
}
