ReferenceDataId (OpenGamma Strata)

Type Parameters:

T - the type of the reference data this identifier refers to

All Known Implementing Classes:

EtdContractSpecId, HolidayCalendarId, LegalEntityId, SecurityId
```
public interface ReferenceDataId<T>
```
An identifier for a unique item of reference data.
Reference data is obtained from an instance of ReferenceData using this identifier.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`Class<T>`	`getReferenceDataType()`	Gets the type of data this identifier refers to.
`default T`	`queryValueOrNull(ReferenceData refData)`	Low-level method to query the reference data value associated with this identifier, returning null if not found.

- Method Detail
  - getReferenceDataType
```
Class<T> getReferenceDataType()
```
    Gets the type of data this identifier refers to.
    
    Returns:
    
    the type of the reference data this identifier refers to
  - queryValueOrNull
```
default T queryValueOrNull(ReferenceData refData)
```
    Low-level method to query the reference data value associated with this identifier, returning null if not found.
    This is a low-level method that obtains the reference data value, returning null instead of an error. Applications should use ReferenceData.getValue(ReferenceDataId) in preference to this method.
    
    Parameters:
    
    refData - the reference data to lookup the value in
    
    Returns:
    
    the reference data value, null if not found