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.arrow.vector.complex.impl;
  
  import org.apache.arrow.vector.complex.MapVector;
  import org.apache.arrow.vector.complex.reader.FieldReader;
  import org.apache.arrow.vector.types.Types.MinorType;
  
  /** Reader for a MapVector. */
  public class UnionMapReader extends UnionListReader {
  
    private String keyName = MapVector.KEY_NAME;
    private String valueName = MapVector.VALUE_NAME;
  
    /**
     * Construct a new reader for the given vector.
     *
     * @param vector Vector to read from.
     */
    public UnionMapReader(MapVector vector) {
      super(vector);
    }
  
    /**
     * Set the key, value field names to read.
     *
     * @param key Field name for key.
     * @param value Field name for value.
     */
    public void setKeyValueNames(String key, String value) {
      keyName = key;
      valueName = value;
    }
  
    /**
     * Start reading a key from the map entry.
     *
     * @return reader that can be used to read the key.
     */
    public FieldReader key() {
      return reader().reader(keyName);
    }
  
    /**
     * Start reading a value element from the map entry.
     *
     * @return reader that can be used to read the value.
     */
    public FieldReader value() {
      return reader().reader(valueName);
    }
  
    /** Return the MinorType of the reader as MAP. */
    @Override
    public MinorType getMinorType() {
      return MinorType.MAP;
    }
  }
  