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.types;
  
  /** Different memory layouts for Union Vectors. */
  public enum UnionMode {
    /**
     * Each child vector is the same length as the overall vector, and there is one 8-bit integer
     * buffer to indicate the index of a child vector to use at any given position.
     */
    Sparse(org.apache.arrow.flatbuf.UnionMode.Sparse),
    /**
     * Each child vector is of variable width. The parent vector contains both a child index vector
     * (like in {@link #Sparse}) and in addition a slot index buffer to determine the offset into the
     * child vector indicated by the index vector.
     */
    Dense(org.apache.arrow.flatbuf.UnionMode.Dense);
  
    private static final UnionMode[] valuesByFlatbufId = new UnionMode[UnionMode.values().length];
  
    static {
      for (UnionMode v : UnionMode.values()) {
        valuesByFlatbufId[v.flatbufID] = v;
      }
    }
  
    private final short flatbufID;
  
    private UnionMode(short flatbufID) {
      this.flatbufID = flatbufID;
    }
  
    public short getFlatbufID() {
      return flatbufID;
    }
  
    public static UnionMode fromFlatbufID(short id) {
      return valuesByFlatbufId[id];
    }
  }
  