/**
 * Copyright 2014 National University of Ireland, Galway.
 *
 * This file is part of the SIREn project. Project and contact information:
 *
 *  https://github.com/rdelbru/SIREn
 *
 * Licensed 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.sindice.siren.solr.analysis;

import java.util.Map;

import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.util.TokenFilterFactory;
import org.sindice.siren.analysis.filter.URILocalnameFilter;

/**
 * Factory for {@link URILocalnameFilter}.
 *
 * <p>
 *
 * The property {@value #MAXLENGTH_KEY} can be set to define the maximum length
 * for a localname to be tokenized. The default positionIncrement value is
 * {@value URILocalnameFilter.DEFAULT_MAX_LENGTH.
 */
public class URILocalnameFilterFactory extends TokenFilterFactory {

  public static final String MAXLENGTH_KEY = "maxLength";

  private int maxLength = 0;

  @Override
  public void init(final Map<String,String> args) {
   super.init(args);
   final String maxArg = args.get(MAXLENGTH_KEY);
   maxLength = (maxArg != null ? Integer.parseInt(maxArg) : URILocalnameFilter.DEFAULT_MAX_LENGTH);
  }

  @Override
  public TokenStream create(final TokenStream input) {
    final URILocalnameFilter filter = new URILocalnameFilter(input);
    filter.setMaxLength(maxLength);
    return filter;
  }

}