hollow/src/main/java/com/netflix/hollow/tools/history/HollowHistoricalStateCreator.java
public HollowHistoricalStateDataAccess createBasedOnNewDelta(long version, HollowReadStateEngine stateEngine) {
        IntMapOrdinalRemapper typeRemovedOrdinalMapping = new IntMapOrdinalRemapper();

        List<HollowTypeReadState> historicalTypeStates = new ArrayList<HollowTypeReadState>(stateEngine.getTypeStates().size());

        for(HollowTypeReadState typeState : stateEngine.getTypeStates()) {
            createDeltaHistoricalTypeState(typeRemovedOrdinalMapping, historicalTypeStates, typeState);
        }

        HollowHistoricalStateDataAccess dataAccess = new HollowHistoricalStateDataAccess(totalHistory, version, stateEngine, historicalTypeStates, typeRemovedOrdinalMapping, Collections.<String, HollowHistoricalSchemaChange>emptyMap());
        dataAccess.setNextState(stateEngine);

        return dataAccess;
    }
public HollowHistoricalStateDataAccess createBasedOnNewDelta(long version, HollowReadStateEngine stateEngine) {
        IntMapOrdinalRemapper typeRemovedOrdinalMapping = new IntMapOrdinalRemapper();

        List<HollowTypeReadState> historicalTypeStates = new ArrayList<HollowTypeReadState>(stateEngine.getTypeStates().size());

        for(HollowTypeReadState typeState : stateEngine.getTypeStates()) {
            createDeltaHistoricalTypeState(typeRemovedOrdinalMapping, historicalTypeStates, typeState);
        }

        HollowHistoricalStateDataAccess dataAccess = new HollowHistoricalStateDataAccess(totalHistory, version, stateEngine, historicalTypeStates, typeRemovedOrdinalMapping, Collections.<String, HollowHistoricalSchemaChange>emptyMap());
        dataAccess.setNextState(stateEngine);

        return dataAccess;
    }
Create a {@link HollowDataAccess} for the prior state of the supplied {@link HollowReadStateEngine} after a delta
has been applied.

@param version The state's version
@param stateEngine The current {@link HollowReadStateEngine} to which a delta has been applied.
@return a data access for history