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.VectorSchemaRoot;
  
  public class ArrowBatchConstructor<IN> {
  
      private final VectorSchemaRoot root;
      private final ArrowFieldWriter<IN>[] fieldWriters;
  
      public ArrowBatchConstructor(VectorSchemaRoot root, ArrowFieldWriter<IN>[] fieldWriters) {
          this.root = Preconditions.checkNotNull(root, "Vector schema root");
          this.fieldWriters = Preconditions.checkNotNull(fieldWriters, "Field writers");
      }
  
      public void write(IN row) {
          for (int i = 0; i < fieldWriters.length; i++) {
              fieldWriters[i].write(row, i);
          }
      }
  
      public void finish() {
          root.setRowCount(fieldWriters[0].getCount());
          for (ArrowFieldWriter<IN> fieldWriter : fieldWriters) {
              fieldWriter.finish();
          }
      }
  
      public void reset() {
          root.setRowCount(0);
          for (ArrowFieldWriter<IN> fieldWriter : fieldWriters) {
              fieldWriter.reset();
          }
      }
  
      public VectorSchemaRoot getVectorSchemaRoot() {
          return root;
      }
  }
  