/**
 * 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.util.Iterator;

import org.apache.lucene.index.Term;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;

import org.json.JSONException;
import org.json.JSONObject;


public class TermQueryConstructor extends QueryConstructor
{
  public static final String QUERY_TYPE = "term";

  // "term" : {
  //   "color" : "red"
  // 
  //   // or "color" : {"value" : "red", "boost": 2.0}
  // },

  @Override
  public Query doConstructQuery(JSONObject json) throws JSONException
  {
    Iterator<String> iter = json.keys();
    if (!iter.hasNext())
      throw new IllegalArgumentException("no term value specified: " + json);

    String field = iter.next();

    Object obj = json.get(field);

    String txt;
    float boost;
    if (obj instanceof JSONObject)
    {
      txt = ((JSONObject)obj).optString(TERM_PARAM);
      if (txt == null || txt.length() == 0)
        txt = ((JSONObject)obj).getString(VALUE_PARAM);
      boost = (float)((JSONObject)obj).optDouble(BOOST_PARAM, 1.0);
    }
    else
    {
      txt   = (String)obj;
      boost = 1.0f;
    }
    Query q = new TermQuery(new Term(field, txt));
    q.setBoost(boost);
    return q;
  }
}