// This prevents the dreaded KeyValueCoding null object exception, for say key paths:
// object.entityName
// Should just return null instead of throwing.
public static Object contextValueForKeyNoInferenceNoException(D2WContext c, String keyPath) {
Object result = null;
int i = keyPath.indexOf(".");
if (i == -1) {
result = c.valueForKeyNoInference(keyPath);
} else {
String first = keyPath.substring(0, i);
String second = keyPath.substring(i + 1);
result = c.valueForKeyNoInference(first);
if (result != null) {
// Optimized for two paths deep
try {
if (second.indexOf(".") == -1) {
result = NSKeyValueCoding.Utility.valueForKey(result, second);
} else {
NSArray parts = NSArray.componentsSeparatedByString(second, ".");
for (int j = 0; j < parts.count(); j++) {
String part = (String) parts.objectAtIndex(j);
result = NSKeyValueCoding.Utility.valueForKey(result, part);
if (result == null) break;
}
}
} catch (NSKeyValueCoding.UnknownKeyException e) {
if (log.isDebugEnabled()) {
log.debug(
"keyPath {} is not available for context with entity: {}; task: {}",
keyPath,
c.entity().name(),
c.task());
}
return null;
}
}
}
return result;
}
public static void finalizeContext(D2WContext context) {
if (context != null) context.pageFinalized();
}