/**
* This software is licensed to you under the Apache License, Version 2.0 (the
* "Apache License").
*
* LinkedIn's contributions are made under the Apache License. If you contribute
* to the Software, the contributions will be deemed to have been made under the
* Apache License, unless you expressly indicate otherwise. Please do not make any
* contributions that would be inconsistent with the Apache License.
*
* You may obtain a copy of the Apache License at http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, this software
* distributed under the Apache License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the Apache
* License for the specific language governing permissions and limitations for the
* software governed under the Apache License.
*
* © 2012 LinkedIn Corp. All Rights Reserved.
*/
package com.senseidb.search.query;
import java.io.IOException;
import java.io.StringReader;
import java.util.Iterator;
import org.apache.log4j.Logger;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.tokenattributes.TermAttribute;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.MultiPhraseQuery;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.json.JSONException;
import org.json.JSONObject;
public class TextQueryConstructor extends QueryConstructor
{
private static final Logger logger = Logger.getLogger(TextQueryConstructor.class);
public static final String QUERY_TYPE = "text";
// "text" : {
// "message" : "this is a test", // field: "message", query: "this is a test"
// "operator" : "or", // operator, possible values: "and", "or"
// "type" : "phrase" // query type, can be "phrase", "phrase_prefix"
// },
private Analyzer _analyzer;
public TextQueryConstructor(QueryParser qparser)
{
_analyzer = qparser.getAnalyzer();
}
@Override
public Query doConstructQuery(JSONObject json) throws JSONException
{
String op = null;
String type = null;
String field = null;
String text = null;
Iterator<String> iter = json.keys();
if (!iter.hasNext())
throw new IllegalArgumentException("text field not fould");
field = iter.next();
Object obj = json.get(field);
if (obj instanceof JSONObject)
{
text = ((JSONObject)obj).getString(VALUE_PARAM);
op = ((JSONObject)obj).optString(OPERATOR_PARAM);
type = ((JSONObject)obj).optString(TYPE_PARAM);
}
else
{
text = String.valueOf(obj);
}
TokenStream tokenStream = _analyzer.tokenStream(field, new StringReader(text));
TermAttribute termAttribute = tokenStream.getAttribute(TermAttribute.class);
try
{
if (PHRASE_PARAM.equals(type))
{
PhraseQuery q = new PhraseQuery();
while (tokenStream.incrementToken())
{
q.add(new Term(field, termAttribute.term()));
}
return q;
}
else if (PHRASE_PREFIX_PARAM.equals(type))
{
MultiPhraseQuery q = new MultiPhraseQuery();
while (tokenStream.incrementToken())
{
q.add(new Term(field, termAttribute.term()));
}
return q;
}
else
{
BooleanQuery q = new BooleanQuery();
if (AND_PARAM.equals(op))
{
while (tokenStream.incrementToken())
{
q.add(new TermQuery(new Term(field, termAttribute.term())), BooleanClause.Occur.MUST);
}
}
else
{
while (tokenStream.incrementToken())
{
q.add(new TermQuery(new Term(field, termAttribute.term())), BooleanClause.Occur.SHOULD);
}
}
return q;
}
}
catch(IOException ioe)
{
logger.error(ioe.getMessage(), ioe);
return null;
}
}
}