content: /*
   * 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.asterix.column.values;
  
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IValueReference;
  
  /**
   * Accessor for key columns
   */
  public interface IColumnKeyValueReader {
      /**
       * Reset the reader at the given index
       *
       * @param startIndex start index
       * @param skipCount  number of values should be skipped
       * @return return the number of encountered anti-matters
       */
      int reset(int startIndex, int skipCount) throws HyracksDataException;
  
      /**
       * Returns the value of the key at the given index
       *
       * @param index tuple index
       * @return the key value
       */
      IValueReference getValue(int index);
  }
  