/*
 * Created on 25-Jan-2006
 */
package org.apache.lucene.queryparser.xml.builders;

import org.apache.lucene.queryparser.xml.DOMUtils;
import org.apache.lucene.queryparser.xml.FilterBuilder;
import org.apache.lucene.queryparser.xml.ParserException;
import org.apache.lucene.sandbox.queries.DuplicateFilter;
import org.apache.lucene.search.Filter;
import org.w3c.dom.Element;

/*
 * 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.
 */

/**
 * Builder for {@link DuplicateFilter}
 */
public class DuplicateFilterBuilder implements FilterBuilder {

  @Override
  public Filter getFilter(Element e) throws ParserException {
    String fieldName = DOMUtils.getAttributeWithInheritanceOrFail(e, "fieldName");
    DuplicateFilter df = new DuplicateFilter(fieldName);

    String keepMode = DOMUtils.getAttribute(e, "keepMode", "first");
    if (keepMode.equalsIgnoreCase("first")) {
      df.setKeepMode(DuplicateFilter.KeepMode.KM_USE_FIRST_OCCURRENCE);
    } else if (keepMode.equalsIgnoreCase("last")) {
      df.setKeepMode(DuplicateFilter.KeepMode.KM_USE_LAST_OCCURRENCE);
    } else {
      throw new ParserException("Illegal keepMode attribute in DuplicateFilter:" + keepMode);
    }

    String processingMode = DOMUtils.getAttribute(e, "processingMode", "full");
    if (processingMode.equalsIgnoreCase("full")) {
      df.setProcessingMode(DuplicateFilter.ProcessingMode.PM_FULL_VALIDATION);
    } else if (processingMode.equalsIgnoreCase("fast")) {
      df.setProcessingMode(DuplicateFilter.ProcessingMode.PM_FAST_INVALIDATION);
    } else {
      throw new ParserException("Illegal processingMode attribute in DuplicateFilter:" + processingMode);
    }

    return df;
  }

}