void saveItemset(Itemset itemset) throws IOException {
itemsetCount++;
// if the result should be saved to a file
if (writer != null) {
writer.write(itemset.toString() + " #SUP: " + itemset.getAbsoluteSupport());
writer.newLine();
} // otherwise the result is kept into memory
else {
patterns.addItemset(itemset, itemset.size());
}
}
void saveItemsetToFile(Integer item, Integer support) throws IOException {
itemsetCount++;
// if the result should be saved to a file
if (writer != null) {
writer.write(item + " #SUP: " + support);
writer.newLine();
} // otherwise the result is kept into memory
else {
Itemset itemset = new Itemset(item);
itemset.setAbsoluteSupport(support);
patterns.addItemset(itemset, 1);
}
}
/**
* Write a frequent itemset that is found to the output file or keep into memory if the user
* prefer that the result be saved into memory.
*/
private void saveItemset(int[] itemset, int itemsetLength, int support) throws IOException {
// increase the number of itemsets found for statistics purpose
itemsetCount++;
// if the result should be saved to a file
if (writer != null) {
// copy the itemset in the output buffer and sort items
System.arraycopy(itemset, 0, itemsetOutputBuffer, 0, itemsetLength);
Arrays.sort(itemsetOutputBuffer, 0, itemsetLength);
// Create a string buffer
StringBuilder buffer = new StringBuilder();
// write the items of the itemset
for (int i = 0; i < itemsetLength; i++) {
buffer.append(itemsetOutputBuffer[i]);
if (i != itemsetLength - 1) {
buffer.append(' ');
}
}
// Then, write the support
buffer.append(" #SUP: ");
buffer.append(support);
// write to file and create a new line
writer.write(buffer.toString());
writer.newLine();
} // otherwise the result is kept into memory
else {
// create an object Itemset and add it to the set of patterns
// found.
int[] itemsetArray = new int[itemsetLength];
System.arraycopy(itemset, 0, itemsetArray, 0, itemsetLength);
// sort the itemset so that it is sorted according to lexical ordering before we show it to
// the user
Arrays.sort(itemsetArray);
Itemset itemsetObj = new Itemset(itemsetArray);
itemsetObj.setAbsoluteSupport(support);
patterns.addItemset(itemsetObj, itemsetLength);
}
}