"no inclosing instance error " while getting top term frequencies for document from Lucene index
- by Julia
Hello !
I am trying to get the most occurring term frequencies for every particular document in Lucene index. I am trying to set the treshold of top occuring terms that I care about, maybe 20
However, I am getting the "no inclosing instance of type DisplayTermVectors is accessible" when calling Comparator...
So to this function I pass vector of every document and max top terms i would like to know
protected static Collection getTopTerms(TermFreqVector tfv, int maxTerms){
String[] terms = tfv.getTerms();
int[] tFreqs = tfv.getTermFrequencies();
List result = new ArrayList(terms.length);
for (int i = 0; i < tFreqs.length; i++) {
TermFrq tf = new TermFrq(terms[i], tFreqs[i]);
result.add(tf);
}
Collections.sort(result, new FreqComparator());
if(maxTerms < result.size()){
result = result.subList(0, maxTerms);
}
return result;
}
/Class for objects to hold the term/freq pairs/
static class TermFrq{
private String term;
private int freq;
public TermFrq(String term,int freq){
this.term = term;
this.freq = freq;
}
public String getTerm(){
return this.term;
}
public int getFreq(){
return this.freq;
}
}
/*Comparator to compare the objects by the frequency*/
class FreqComparator implements Comparator{
public int compare(Object pair1, Object pair2){
int f1 = ((TermFrq)pair1).getFreq();
int f2 = ((TermFrq)pair2).getFreq();
if(f1 > f2) return 1;
else if(f1 < f2) return -1;
else return 0;
}
}
Explanations and corrections i will very much appreciate, and also if someone else had experience with term frequency extraction and did it better way, I am opened to all suggestions!
Please help!!!! Thanx!
