private void buildFieldsDefsExtension(Map<Integer, CompositeDef> existingCodecs) {
NodeList messageExtList = doc.getElementsByTagName(ELEMENT_MESSAGE_EXT);
Map<Integer, CompositeDef> extensions = new TreeMap<>();
for (int i = 0; i < messageExtList.getLength(); i++) {
Element messageDef = (Element) messageExtList.item(i);
Integer mtiExisting = getOptionalInteger(messageDef, ATTR_EXTENDS);
Integer mti = getOptionalInteger(messageDef, ATTR_MTI);
if (existingCodecs.containsKey(mti) || extensions.containsKey(mti)) {
throw new ConfigException(format("Duplicate message config for mti %d", mti));
}
CompositeDef existing = existingCodecs.get(mtiExisting);
if (existing == null) {
throw new ConfigException(format("Error extending mti %d, no config available", mti));
}
SortedMap<Integer, ComponentDef> clonedFieldsDef =
cloneSubComponentDefs(existing.getSubComponentDefs());
Element setElement = null;
Element removeElement = null;
for (Element e : getSubElements(messageDef)) {
switch (e.getTagName()) {
case ELEMENT_SET:
setElement = e;
break;
case ELEMENT_REMOVE:
removeElement = e;
break;
default:
throw new ConfigException(
format("Unknown message extension instruction %s", e.getTagName()));
}
}
if (setElement != null) {
setVarFields(clonedFieldsDef, getSubElements(setElement));
}
if (removeElement != null) {
removeFields(clonedFieldsDef, getSubElements(removeElement));
}
extensions.put(
mti,
new CompositeDef(
clonedFieldsDef,
existing.getCompositeCodec(),
existing.isMandatory(),
existing.getLengthCodec()));
}
existingCodecs.putAll(extensions);
}
private SortedMap<Integer, ComponentDef> cloneSubComponentDefs(
SortedMap<Integer, ComponentDef> existingDefs) {
SortedMap<Integer, ComponentDef> clone = new TreeMap<>();
for (Entry<Integer, ComponentDef> defEntry : existingDefs.entrySet()) {
Integer index = defEntry.getKey();
ComponentDef def = defEntry.getValue();
if (def instanceof CompositeDef) {
CompositeDef compositeDef = (CompositeDef) def;
clone.put(
index,
new CompositeDef(
cloneSubComponentDefs(compositeDef.getSubComponentDefs()),
compositeDef.getCompositeCodec(),
compositeDef.isMandatory(),
compositeDef.getLengthCodec()));
} else {
clone.put(index, new ComponentDef(def.getCodec(), def.isMandatory()));
}
}
return clone;
}