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.util;
  
  import com.fasterxml.jackson.core.JsonProcessingException;
  import com.fasterxml.jackson.databind.ObjectMapper;
  import java.util.LinkedHashMap;
  
  /**
   * Simple class that extends the regular java.util.HashMap but overrides the toString() method of
   * the HashMap class to produce a JSON string instead
   *
   * @param <K> The type of the key for the map.
   * @param <V> The type of the value for the map.
   */
  public class JsonStringHashMap<K, V> extends LinkedHashMap<K, V> {
  
    private static final ObjectMapper MAPPER = ObjectMapperFactory.newObjectMapper();
  
    @Override
    public final String toString() {
      try {
        return MAPPER.writeValueAsString(this);
      } catch (JsonProcessingException e) {
        throw new IllegalStateException("Cannot serialize hash map to JSON string", e);
      }
    }
  }
  