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 com.aliyun.odps.table.arrow.constructor;
  
  import com.aliyun.odps.table.utils.Preconditions;
  import org.apache.arrow.vector.complex.ListVector;
  
  /**
   * {@link ArrowFieldWriter} for Array.
   */
  public abstract class ArrowArrayWriter<IN, TYPE_ARRAY> extends ArrowFieldWriter<IN> {
  
      protected final ListVector listVector;
      protected ArrowFieldWriter<TYPE_ARRAY> elementWriter;
  
      public ArrowArrayWriter(ListVector listVector,
                              ArrowFieldWriter<TYPE_ARRAY> elementWriter) {
          super(listVector);
          this.listVector = listVector;
          this.elementWriter = Preconditions.checkNotNull(elementWriter, "Array element writer");
      }
  
      protected abstract TYPE_ARRAY readArray(IN in, int ordinal);
  
      protected abstract int numElements(TYPE_ARRAY arrayData);
  
      @Override
      protected void setValue(IN in, int ordinal) {
          ((ListVector) valueVector).startNewValue(getCount());
          TYPE_ARRAY array = readArray(in, ordinal);
          int size = numElements(array);
          for (int i = 0; i < size; i++) {
              elementWriter.write(array, i);
          }
          ((ListVector) valueVector).endValue(getCount(), size);
      }
  
      @Override
      protected void setNull() {
      }
  
      @Override
      public void finish() {
          super.finish();
          elementWriter.finish();
      }
  
      @Override
      public void reset() {
          super.reset();
          elementWriter.reset();
      }
  }
  