/**
* Create a projected database by pseudo-projection
*
* @param item The item to use to make the pseudo-projection
* @param context The current database.
* @param inSuffix This boolean indicates if the item "item" is part of a suffix or not.
* @return the projected database.
*/
private List<PseudoSequenceBIDE> buildProjectedDatabase(
Integer item, List<PseudoSequenceBIDE> database, boolean inSuffix, Set<Integer> sidset) {
// The projected pseudo-database
List<PseudoSequenceBIDE> sequenceDatabase = new ArrayList<PseudoSequenceBIDE>();
// for each sequence
loop1:
for (PseudoSequenceBIDE sequence : database) {
if (sidset.contains(sequence.getId()) == false) {
continue;
}
// for each item of the sequence
for (int i = 0; i < sequence.size(); i++) {
int sizeOfItemsetAti = sequence.getSizeOfItemsetAt(i);
// check if the itemset contains the item that we use for the projection
int index = sequence.indexOf(sizeOfItemsetAti, i, item);
// if it does not, and the current item is part of a suffix if inSuffix is true
// and vice-versa
if (index != -1 && sequence.isPostfix(i) == inSuffix) {
if (index != sizeOfItemsetAti - 1) { // if this is not the last item of the itemset
// create a new pseudo sequence
// add it to the projected database.
sequenceDatabase.add(new PseudoSequenceBIDE(sequence, i, index + 1));
// continue loop1;
// }
} else if ((i
!= sequence.size() - 1)) { // if this is not the last itemset of the sequence
// create a new pseudo sequence
// add it to the projected database.
sequenceDatabase.add(new PseudoSequenceBIDE(sequence, i + 1, 0));
// continue loop1;
}
}
}
}
return sequenceDatabase; // return the projected database
}
/**
* Create a projected database by pseudo-projection
*
* @param item The item to use to make the pseudo-projection
* @param context The current database.
* @param inSuffix This boolean indicates if the item "item" is part of a suffix or not.
* @return the projected database.
*/
private List<PseudoSequenceBIDE> buildProjectedContextSingleItem(
Integer item,
Map<Integer, PseudoSequenceBIDE> initialDatabase2,
boolean inSuffix,
Set<Integer> sidset) {
// The projected pseudo-database
List<PseudoSequenceBIDE> sequenceDatabase = new ArrayList<PseudoSequenceBIDE>();
// for each sequence
loop1:
for (int sid : sidset) {
PseudoSequenceBIDE sequence = initialDatabase2.get(sid);
// for each itemset of the sequence
for (int i = 0; i < sequence.size(); i++) {
int sizeOfItemsetAti = sequence.getSizeOfItemsetAt(i);
// find the position of the item used for the projection in this itemset if it appears
int index = sequence.indexOf(sizeOfItemsetAti, i, item);
// if it does appear and it is in a postfix/suffix if the item is in a postfix/suffix
if (index != -1 && sequence.isPostfix(i) == inSuffix) {
// if this is not the last item of the itemset
if (index != sizeOfItemsetAti - 1) {
// create a new pseudo sequence
sequenceDatabase.add(new PseudoSequenceBIDE(sequence, i, index + 1));
// continue loop1;
} else if (i
!= sequence.size() - 1) { // if this is not the last itemset of the sequence
// create a new pseudo sequence
// if the size of this pseudo sequence is greater than 0
// add it to the projected database.
sequenceDatabase.add(new PseudoSequenceBIDE(sequence, i + 1, 0));
// continue loop1;
}
}
}
}
return sequenceDatabase; // return the projected database
}