If I understand correctly your question is about passing an extra parameter to the DataService when retrieving properties. The solution is to include ParameterSpec[] to the PropertySpec created inside QueryUtil.java:
1) modify QueryUtil.getProperties to pass your extra parameter when called from your DataAccessController,
something like this:
...
ParameterSpec paramSpec = new ParameterSpec();
paramSpec.parameter = yourParamObject; // <== can be a string or a java object.
paramSpec.propertyName = yourPropName; // <== this is the property that will include the extra param in your data provider
...
PropertyValue[] pvs = QueryUtil.getProperties(_dataService, ref, props, paramSpec);
2) modify createPropertySpec() in QueryUtil.java to include that process that parameter
...
private static PropertySpec createPropertySpec(
String[] properties, String targetType, ParameterSpec paramSpec) {
PropertySpec propSpec = new PropertySpec();
propSpec.type = targetType;
propSpec.propertyNames = properties;
propSpec.parameters = new ParameterSpec[] { paramSpec }; // must be an array
return propSpec;
}
3) extract the parameter from the PropertySpec in your data provider
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