java/vector/src/main/java/org/apache/arrow/vector/util/JsonStringArrayList.java

/**
 * 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 java.util.ArrayList;
import java.util.List;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonStringArrayList<E> extends ArrayList<E> {

  private static ObjectMapper mapper;

  static {
    mapper = new ObjectMapper();
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (!(obj instanceof List)) {
      return false;
    }
    List<?> other = (List<?>) obj;
    return this.size() == other.size() && this.containsAll(other);
  }

  @Override
  public final String toString() {
    try {
      return mapper.writeValueAsString(this);
    } catch(JsonProcessingException e) {
      throw new IllegalStateException("Cannot serialize array list to JSON string", e);
    }
  }
}