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.dictionary;
  
  import java.util.Objects;
  import org.apache.arrow.vector.FieldVector;
  import org.apache.arrow.vector.compare.VectorEqualsVisitor;
  import org.apache.arrow.vector.types.pojo.ArrowType;
  import org.apache.arrow.vector.types.pojo.DictionaryEncoding;
  
  /**
   * A dictionary (integer to Value mapping) that is used to facilitate dictionary encoding
   * compression.
   */
  public class Dictionary {
  
    private final DictionaryEncoding encoding;
    private final FieldVector dictionary;
  
    public Dictionary(FieldVector dictionary, DictionaryEncoding encoding) {
      this.dictionary = dictionary;
      this.encoding = encoding;
    }
  
    public FieldVector getVector() {
      return dictionary;
    }
  
    public DictionaryEncoding getEncoding() {
      return encoding;
    }
  
    public ArrowType getVectorType() {
      return dictionary.getField().getType();
    }
  
    @Override
    public String toString() {
      return "Dictionary " + encoding + " " + dictionary;
    }
  
    @Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (!(o instanceof Dictionary)) {
        return false;
      }
      Dictionary that = (Dictionary) o;
      return Objects.equals(encoding, that.encoding)
          && new VectorEqualsVisitor().vectorEquals(that.dictionary, dictionary);
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(encoding, dictionary);
    }
  }
  