/**
* Checks if the passed condition is true based on the passed list of node responses. If the id
* does not exist in the responses, assume the response is NULL.
*
* @param condition The condition to check.
* @param previousResponses The List of previous responses.
* @return Whether or not the condition is true.
*/
public static boolean evaluateCondition(String condition, List<DataPoint> previousResponses) {
// Blank conditions are always valid
if (!"".equals(condition)) {
start s = null;
try {
// The API is odd, we have to instantiate an object just to use its static methods below,
// we do not actually need to keep the object around for any reason
if (!conditionParserInitialized) {
new ConditionParser(new StringReader(condition));
conditionParserInitialized = true;
} else {
ConditionParser.ReInit(new StringReader(condition));
}
// Call start statically even though we have to instantiate the object above
s = ConditionParser.start();
ConditionDepthFirst<Boolean, Boolean> visitor =
new ConditionDepthFirst<Boolean, Boolean>(previousResponses);
// Check the condition against the previous responses
Boolean conditionValue = visitor.visit(s, null);
/*if (DataPointConditionEvaluator._logger.isDebugEnabled()) {
DataPointConditionEvaluator._logger.debug("Condition [" + condition + "] evaluated as " + conditionValue.toString());
}*/
Log.v(TAG, "Condition [" + condition + "] evaluated as " + conditionValue.toString());
return conditionValue.booleanValue();
} catch (ParseException pe) {
throw new IllegalArgumentException(
"Condition failed to parse, should have been checked in the XML validator: "
+ condition);
}
}
return true;
}
