/**
* This method creates a copy of the sequence and add a given item to the last itemset of the
* sequence. It sets the support of the sequence as the support of the item.
*
* @param prefix the sequence
* @param item the item
* @return the new sequence
*/
private SequentialPattern appendItemToPrefixOfSequence(SequentialPattern prefix, Integer item) {
SequentialPattern newPrefix = prefix.cloneSequence();
// add to the last itemset
Itemset itemset = newPrefix.get(newPrefix.size() - 1);
itemset.addItem(item);
return newPrefix;
}
/**
* This method creates a copy of the sequence and add a given item to the last itemset of the
* sequence. It sets the support of the sequence as the support of the item.
*
* @param prefix the sequence
* @param item the item
* @return the new sequence
*/
private SequentialPattern appendItemToPrefixOfSequence(SequentialPattern prefix, String item) {
SequentialPattern newPrefix = prefix.cloneSequence();
Itemset itemset = newPrefix.get(newPrefix.size() - 1);
itemset.addItem(item);
return newPrefix;
}
/**
* This method creates a copy of the sequence and add a given item as a new itemset to the
* sequence. It sets the support of the sequence as the support of the item.
*
* @param prefix the sequence
* @param item the item
* @return the new sequence
*/
private SequentialPattern appendItemToSequence(SequentialPattern prefix, Integer item) {
SequentialPattern newPrefix = prefix.cloneSequence(); // isSuffix
newPrefix.addItemset(new Itemset(item));
return newPrefix;
}
/**
* This method creates a copy of the sequence and add a given item as a new itemset to the
* sequence. It sets the support of the sequence as the support of the item.
*
* @param prefix the sequence
* @param item the item
* @return the new sequence
*/
private SequentialPattern appendItemToSequence(SequentialPattern prefix, String item) {
SequentialPattern newPrefix = prefix.cloneSequence();
newPrefix.addItemset(new Itemset(item));
return newPrefix;
}