/**
* A local sort at a particular node along the deep sorting operation. This is a recursive
* function.
*
* @param currentFeatureIdx The currently tested feature.
* @param currentNode The current node, holding the currently processed zone in the array of
* feature vectors.
*/
private void sortNode(int currentFeatureIdx, MaryNode currentNode) {
/* If we have reached a leaf, do a final sort according to the unit index and return: */
if (currentFeatureIdx == featureSequence.length) {
Arrays.sort(featureVectors, currentNode.from, currentNode.to, cui);
numberOfLeaves++;
/*System.out.print( "LEAF ! (" + (currentNode.to-currentNode.from) + " units)" );
for ( int i = currentNode.from; i < currentNode.to; i++ ) {
System.out.print( " (" + featureVectors[i].getUnitIndex() + " 0)" );
}
System.out.println( "" );*/
return;
}
/* Else: */
int currentFeature = featureSequence[currentFeatureIdx];
FeatureVector.FeatureType featureType = featureVectors[0].getFeatureType(currentFeature);
/* Register the feature currently used for the splitting */
currentNode.setFeatureIndex(currentFeature);
/* Perform the sorting according to the currently considered feature: */
/* 1) position the comparator onto the right feature */
c.setFeatureIdx(currentFeature, featureType);
/* 2) do the sorting */
Arrays.sort(featureVectors, currentNode.from, currentNode.to, c);
/* Then, seek for the zones where the feature value is the same,
* and launch the next sort level on these. */
int nVal = featureDefinition.getNumberOfValues(currentFeature);
currentNode.split(nVal);
int nextFrom = currentNode.from;
int nextTo = currentNode.from;
for (int i = 0; i < nVal; i++) {
nextFrom = nextTo;
// System.out.print( "Next node begins at " + nextFrom );
while ((nextTo < currentNode.to)
&& (featureVectors[nextTo].getFeatureAsInt(currentFeature) == i)) {
// System.out.print( " " + featureVectors[nextTo].getFeatureAsInt( currentFeature ) );
nextTo++;
}
// System.out.println( " and ends at " + nextTo + " for a total of " + (nextTo-nextFrom) + "
// units." );
if ((nextTo - nextFrom) != 0) {
MaryNode nod = new MaryNode(nextFrom, nextTo);
currentNode.setChild(i, nod);
// System.out.print("(" + i + " isByteOf " + currentFeature + ")" );
sortNode(currentFeatureIdx + 1, nod);
} else currentNode.setChild(i, null);
}
}