package com.develop.ss.search;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Hits;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import java.io.Serializable;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.List;
import java.util.ArrayList;
public class QueryBean implements Serializable {
private String query;
private String index;
private String field;
private List results = new ArrayList();
private static float THRESHOLD_SCORE = 0.05f;
public QueryBean(String index, String query, String field)
{
this.field = field;
this.index = index;
this.query = query;
}
public QueryBean(String index, String query)
{
this(index, query, "contents");
}
public String getQuery() {
return query;
}
public HitBean[] getResults() {
return (HitBean[]) results.toArray(new HitBean[results.size()]);
}
public HitBean getResult(int index) {
return (HitBean) results.get(index);
}
public String getIndex() {
return index;
}
public void setIndex(String index) {
this.index = index;
}
public String getField() {
return field;
}
public void setField(String field) {
this.field = field;
}
public void setQuery(String query) {
this.query = query;
}
//TODO: needed, and need, better unit tests here
public void execute() throws IOException, ParseException {
results.clear();
if (query == null) return;
if (field == null) throw new IllegalArgumentException("field cannot be null");
if (index == null) throw new IllegalArgumentException("index cannot be null");
IndexSearcher indexSearcher = new IndexSearcher(index);
try {
Analyzer analyzer = new StandardAnalyzer();
Query q = QueryParser.parse(query, field, analyzer);
Hits hits = indexSearcher.search(q);
for (int n=0; n<hits.length(); n++) {
if (hits.score(n) < THRESHOLD_SCORE) {
return;
}
Document d = hits.doc(n);
String title = safeGetFieldString(d, "title");
results.add(new HitBean(d.getField("url").stringValue(), safeGetFieldString(d, "title"), hits.score(n)));
}
} finally {
indexSearcher.close();
}
}
private String safeGetFieldString(Document d, String field) {
Field f = d.getField(field);
return (f == null) ? "" : f.stringValue();
}
}
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