package org.apache.lucene.analysis.miscellaneous;

/*
 * 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.
 */

import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.miscellaneous.LengthFilter;
import org.apache.lucene.analysis.util.TokenFilterFactory;

import java.util.Map;

/**
 * Factory for {@link LengthFilter}. 
 * <pre class="prettyprint" >
 * <fieldType name="text_lngth" class="solr.TextField" positionIncrementGap="100">
 *   <analyzer>
 *     <tokenizer class="solr.WhitespaceTokenizerFactory"/>
 *     <filter class="solr.LengthFilterFactory" min="0" max="1" enablePositionIncrements="false"/>
 *   </analyzer>
 * </fieldType></pre> 
 *
 */
public class LengthFilterFactory extends TokenFilterFactory {
  int min,max;
  boolean enablePositionIncrements;
  public static final String MIN_KEY = "min";
  public static final String MAX_KEY = "max";

  @Override
  public void init(Map<String, String> args) {
    super.init(args);
    String minKey = args.get(MIN_KEY);
    String maxKey = args.get(MAX_KEY);
    if (minKey == null || maxKey == null) {
      throw new IllegalArgumentException("Both " + MIN_KEY + " and " + MAX_KEY + " are mandatory");
    }
    min=Integer.parseInt(minKey);
    max=Integer.parseInt(maxKey);
    enablePositionIncrements = getBoolean("enablePositionIncrements",false);
  }
  
  public LengthFilter create(TokenStream input) {
    return new LengthFilter(enablePositionIncrements, input,min,max);
  }
}