private PrestoContextRules getValueTopicContextRules(PrestoTopic valueTopic) {
PrestoContext context = rules.getContext();
PrestoContext subcontext = PrestoContext.createSubContext(context, field, valueTopic);
PrestoContextRules subrules = presto.getPrestoContextRules(subcontext);
return subrules;
}
private Object getValue(PrestoTopic valueTopic) {
PrestoContextRules subrules = getValueTopicContextRules(valueTopic);
FieldValues fieldValues = presto.getFieldValues(subrules, valueField);
List<? extends Object> values = fieldValues.getValues();
return values.isEmpty() ? null : values.get(0);
}
private ValueFieldConfig getValueFieldConfig(PrestoTopic valueTopic, String valueFieldId) {
String valueTypeId = valueTopic.getTypeId();
ValueFieldConfig valueFieldConfig = valueFieldConfigCache.get(valueTypeId);
if (valueFieldConfig == null) {
PrestoDataProvider dataProvider = presto.getDataProvider();
PrestoSchemaProvider schemaProvider = presto.getSchemaProvider();
PrestoType valueType = schemaProvider.getTypeById(valueTypeId);
PrestoField valueField = valueType.getFieldById(valueFieldId);
Comparator<Object> valueComparator = null;
ObjectNode extra = ExtraUtils.getFieldExtraNode(valueField);
if (extra != null) {
JsonNode handlerNode = extra.path("valueComparator");
if (handlerNode.isObject()) {
FieldValueComparator handler =
AbstractHandler.getHandler(
dataProvider,
schemaProvider,
FieldValueComparator.class,
(ObjectNode) handlerNode);
if (handler != null) {
handler.setPresto(presto);
}
valueComparator = handler;
}
}
if (valueComparator == null) {
valueComparator = new FieldComparator(valueField, false);
}
valueFieldConfig = new ValueFieldConfig(presto, rules, field, valueField, valueComparator);
valueFieldConfigCache.put(valueTypeId, valueFieldConfig);
}
return valueFieldConfig;
}