void Package::MergeJVMDefaultsWithOverrides() {
// Merge jvmuserarg defaults and jvmuserarg overrides to populate FJVMUserArgs.
// 1. If the key is in the config file and not the java.user.preferences the default value is used,
// the one from the config file.
// 2. If the key is in the java.user.preferences then the value from the java.user.preferences is used and
// the config file value is ignored.
// 3. If the key is not in the config file but it is in the java.user.preferences then it is added anyway.
// And if it is removed it won't show back up.
FJVMUserArgs.Clear();
FJVMUserArgs.Append(FDefaultJVMUserArgs);
OrderedMap<TString, TString> overrides = GetJVMUserArgOverrides();
// 1. Iterate over all elements in overrides to see if any items
// override a default value.
std::vector<TString> keys = GetKeysThatAreNotOverridesOfDefaultValues(FJVMUserArgs, overrides);
// 2. All remaining items in overrides are appended to the end.
for (unsigned int index = 0; index< keys.size(); index++) {
TString key = keys[index];
TString value;
if (overrides.GetValue(key, value) == true) {
FJVMUserArgs.Append(key, value);
}
}
}
std::vector<TString> GetKeysThatAreNotDuplicates(OrderedMap<TString, TString> &Defaults,
OrderedMap<TString, TString> &Overrides) {
std::vector<TString> result;
std::vector<TString> overrideKeys = Overrides.GetKeys();
for (size_t index = 0; index < overrideKeys.size(); index++) {
TString overridesKey = overrideKeys[index];
TString overridesValue;
TString defaultValue;
if ((Defaults.ContainsKey(overridesKey) == false) ||
(Defaults.GetValue(overridesKey, defaultValue) == true &&
Overrides.GetValue(overridesKey, overridesValue) == true &&
defaultValue != overridesValue)) {
result.push_back(overridesKey);
}
}
return result;
}
OrderedMap<TString, TString> CreateOrderedMapFromKeyList(OrderedMap<TString, TString> &Map,
std::vector<TString> &Keys) {
OrderedMap<TString, TString> result;
for (size_t index = 0; index < Keys.size(); index++) {
TString key = Keys[index];
TString value;
if (Map.GetValue(key, value) == true) {
result.Append(key, value);
}
}
return result;
}