/**
* Evaluate the has plugin for the given set of features.
*
* @param features The features passed to the aggregator.
* @param discovered A map in which all features encountered in the evaluation will be placed.
* This will not necessarily contain all features in the dependency expression. Only the ones
* in the evaluation chain will be included.
* @param coerceUndefinedToFalse If true, then a feature not being defined will be treated the
* same as if the feature were defined with a value of false.
* @return The evaluated resource based on provided features. If a lack of features prevents us
* from being able to determine the resource, then null is returned. If the required features
* are provided but the evaluation results in no module name, then the empty string is
* returned.
*/
public String evaluate(
Features features, Set<String> discovered, boolean coerceUndefinedToFalse) {
if (feature != null && discovered != null) {
discovered.add(feature);
}
if (feature == null) {
return nodeName;
} else if (!coerceUndefinedToFalse && !features.contains(feature)) {
return null;
} else {
if (features.isFeature(feature)) {
return trueNode.evaluate(features, discovered, coerceUndefinedToFalse);
} else {
return falseNode.evaluate(features, discovered, coerceUndefinedToFalse);
}
}
}
