package org.apache.solr.spelling.suggest.jaspell;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.core.SolrCore;
import org.apache.solr.spelling.suggest.Lookup;
import org.apache.solr.spelling.suggest.UnsortedTermFreqIteratorWrapper;
import org.apache.solr.util.SortedIterator;
import org.apache.solr.util.TermFreqIterator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class JaspellLookup extends Lookup {
private static final Logger LOG = LoggerFactory.getLogger(JaspellLookup.class);
JaspellTernarySearchTrie trie;
private boolean usePrefix = true;
private int editDistance = 2;
@Override
public void init(NamedList config, SolrCore core) {
LOG.info("init: " + config);
}
@Override
public void build(TermFreqIterator tfit) throws IOException {
if (tfit instanceof SortedIterator) {
// make sure it's unsorted
tfit = new UnsortedTermFreqIteratorWrapper(tfit);
}
trie = new JaspellTernarySearchTrie();
trie.setMatchAlmostDiff(editDistance);
while (tfit.hasNext()) {
String key = tfit.next();
float freq = tfit.freq();
if (key.length() == 0) {
continue;
}
trie.put(key, new Float(freq));
}
}
@Override
public boolean add(String key, Object value) {
trie.put(key, value);
// XXX
return false;
}
@Override
public Object get(String key) {
return trie.get(key);
}
@Override
public List<LookupResult> lookup(String key, boolean onlyMorePopular, int num) {
List<LookupResult> res = new ArrayList<LookupResult>();
List<String> list;
int count = onlyMorePopular ? num * 2 : num;
if (usePrefix) {
list = trie.matchPrefix(key, count);
} else {
list = trie.matchAlmost(key, count);
}
if (list == null || list.size() == 0) {
return res;
}
int maxCnt = Math.min(num, list.size());
if (onlyMorePopular) {
LookupPriorityQueue queue = new LookupPriorityQueue(num);
for (String s : list) {
float freq = (Float)trie.get(s);
queue.insertWithOverflow(new LookupResult(s, freq));
}
for (LookupResult lr : queue.getResults()) {
res.add(lr);
}
} else {
for (int i = 0; i < maxCnt; i++) {
String s = list.get(i);
float freq = (Float)trie.get(s);
res.add(new LookupResult(s, freq));
}
}
return res;
}
@Override
public boolean load(File storeDir) throws IOException {
return false;
}
@Override
public boolean store(File storeDir) throws IOException {
return false;
}
}