/// <summary>
/// Instantiate the native resource wrapped
/// </summary>
/// <param name="args">The parameter is not used.</param>
/// <returns>A pointer to the native resource.</returns>
protected override IntPtr CreateNativeResources(params object[] args)
{
if (args.Length != 5)
{
throw new ArgumentException("Fuzzy matcher needs parameters to instantiate native resource.");
}
this.isAccelerated = (bool)args[0];
var targets = args[1] as IList <Target>;
var distance = args[2] as DistanceFunc;
var extractionToPronounceable = args[3] as Func <Extraction, Pronounceable>;
var targetToExtraction = args[4] as Func <Target, Extraction>;
// Managed object needs to be initialized *before* creating the native fuzzy matcher.
this.InitializeManaged(targets, distance, targetToExtraction, extractionToPronounceable);
int targetsCount = targets.Count;
IntPtr native = IntPtr.Zero;
NativeResourceWrapper.CallNative((buffer) =>
{
int bufferSize = NativeResourceWrapper.BufferSize;
var result = FuzzyMatcherBase.FuzzyMatcher_Create(targetsCount, this.nativeDistanceDelegate, this.isAccelerated, out native, buffer, ref bufferSize);
NativeResourceWrapper.BufferSize = bufferSize;
return(result);
});
return(native);
}
/// <summary>
/// Makes the native call to FindNearestWithin method virtual so we can use normal or accelerated version.
/// </summary>
/// <param name="native">Pointer to the native FuzzyMatcher object</param>
/// <param name="count">maximum number of elements to retrieve</param>
/// <param name="limit">threshold under which we have a match using the fuzzy matcher</param>
/// <param name="nearestIdxs">array in which result elements are stored</param>
/// <param name="distances">array in which result distances are stored</param>
/// <param name="buffer">buffer for error message</param>
/// <param name="bufferSize">size of the buffer</param>
/// <returns>The result of the native operation.</returns>
protected virtual NativeResult NativeFindNearestWithin(IntPtr native, int count, double limit, int[] nearestIdxs, double[] distances, StringBuilder buffer, ref int bufferSize)
{
if (this.isAccelerated)
{
return(FuzzyMatcherBase.AcceleratedFuzzyMatcher_FindNearestWithin(native, count, limit, nearestIdxs, distances, buffer, ref bufferSize));
}
else
{
return(FuzzyMatcherBase.FuzzyMatcher_FindNearestWithin(native, count, limit, nearestIdxs, distances, buffer, ref bufferSize));
}
}
