/*
 * Copyright 2013 The greplin-lucene-utils Authors.
 *
 * 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 com.greplin.lucene.util;

import org.apache.lucene.index.IndexReader;

import java.io.IOException;

/**
 * TermDocs intersection utility.
 */
public interface IntersectionProvider {

  /**
   * Get the Intersection instance for the given sub reader.
   * @param reader the sub reader
   * @return the Intersection instance
   * @throws IOException if Lucene encounters IO errors
   */
  Intersection get(IndexReader reader) throws IOException;

}
