ceph/src/arrow/java/vector/src/main/java/org/apache/arrow/vector/dictionary/Dictionary.java

   1 /*
   2  * Licensed to the Apache Software Foundation (ASF) under one or more
   3  * contributor license agreements.  See the NOTICE file distributed with
   4  * this work for additional information regarding copyright ownership.
   5  * The ASF licenses this file to You under the Apache License, Version 2.0
   6  * (the "License"); you may not use this file except in compliance with
   7  * the License.  You may obtain a copy of the License at
   8  *
   9  *    http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 package org.apache.arrow.vector.dictionary;
  19
  20 import java.util.Objects;
  21
  22 import org.apache.arrow.vector.FieldVector;
  23 import org.apache.arrow.vector.compare.VectorEqualsVisitor;
  24 import org.apache.arrow.vector.types.pojo.ArrowType;
  25 import org.apache.arrow.vector.types.pojo.DictionaryEncoding;
  26
  27 /**
  28  * A dictionary (integer to Value mapping) that is used to facilitate
  29  * dictionary encoding compression.
  30  */
  31 public class Dictionary {
  32
  33   private final DictionaryEncoding encoding;
  34   private final FieldVector dictionary;
  35
  36   public Dictionary(FieldVector dictionary, DictionaryEncoding encoding) {
  37     this.dictionary = dictionary;
  38     this.encoding = encoding;
  39   }
  40
  41   public FieldVector getVector() {
  42     return dictionary;
  43   }
  44
  45   public DictionaryEncoding getEncoding() {
  46     return encoding;
  47   }
  48
  49   public ArrowType getVectorType() {
  50     return dictionary.getField().getType();
  51   }
  52
  53   @Override
  54   public String toString() {
  55     return "Dictionary " + encoding + " " + dictionary;
  56   }
  57
  58   @Override
  59   public boolean equals(Object o) {
  60     if (this == o) {
  61       return true;
  62     }
  63     if (o == null || getClass() != o.getClass()) {
  64       return false;
  65     }
  66     Dictionary that = (Dictionary) o;
  67     return Objects.equals(encoding, that.encoding) &&
  68         new VectorEqualsVisitor().vectorEquals(that.dictionary, dictionary);
  69   }
  70
  71   @Override
  72   public int hashCode() {
  73     return Objects.hash(encoding, dictionary);
  74   }
  75 }