lucene/queryparser/src/java/org/apache/lucene/queryparser/flexible/standard/config/FieldBoostMapFCListener.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.lucene.queryparser.flexible.standard.config;

import java.util.Map;

import org.apache.lucene.queryparser.flexible.standard.config.StandardQueryConfigHandler.ConfigurationKeys;
import org.apache.lucene.queryparser.flexible.core.config.FieldConfig;
import org.apache.lucene.queryparser.flexible.core.config.FieldConfigListener;
import org.apache.lucene.queryparser.flexible.core.config.QueryConfigHandler;

/**
 * This listener listens for every field configuration request and assign a
 * {@link ConfigurationKeys#BOOST} to the
 * equivalent {@link FieldConfig} based on a defined map: fieldName -> boostValue stored in
 * {@link ConfigurationKeys#FIELD_BOOST_MAP}.
 * 
 * @see ConfigurationKeys#FIELD_BOOST_MAP
 * @see ConfigurationKeys#BOOST
 * @see FieldConfig
 * @see FieldConfigListener
 */
public class FieldBoostMapFCListener implements FieldConfigListener {

  private QueryConfigHandler config = null;
  
  public FieldBoostMapFCListener(QueryConfigHandler config) {
    this.config = config;
  }

  @Override
  public void buildFieldConfig(FieldConfig fieldConfig) {
    Map<String, Float> fieldBoostMap = this.config.get(ConfigurationKeys.FIELD_BOOST_MAP);
    
    if (fieldBoostMap != null) {
      Float boost = fieldBoostMap.get(fieldConfig.getField());

      if (boost != null) {
        fieldConfig.set(ConfigurationKeys.BOOST, boost);
      }

    }
  }

}