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.adapter.avro.producers;
  
  import java.io.IOException;
  import org.apache.arrow.vector.FieldVector;
  import org.apache.avro.io.Encoder;
  
  /**
   * Producer wrapper which produces nullable types to an avro encoder. Read data from the underlying
   * {@link FieldVector}.
   *
   * @param <T> The vector within producer or its delegate, used for partially produce purpose.
   */
  public class AvroNullableProducer<T extends FieldVector> extends BaseAvroProducer<T> {
  
    private final Producer<T> delegate;
  
    /** Instantiate a AvroNullableProducer. */
    public AvroNullableProducer(Producer<T> delegate) {
      super(delegate.getVector());
      this.delegate = delegate;
    }
  
    @Override
    public void produce(Encoder encoder) throws IOException {
      if (vector.isNull(currentIndex)) {
        encoder.writeInt(1);
        encoder.writeNull();
        delegate.skipNull();
      } else {
        encoder.writeInt(0);
        delegate.produce(encoder);
      }
      currentIndex++;
    }
  
    @Override
    public void skipNull() {
      // Can be called by containers of nullable types
      delegate.skipNull();
      currentIndex++;
    }
  
    @Override
    public void setPosition(int index) {
      if (index < 0 || index > vector.getValueCount()) {
        throw new IllegalArgumentException("Index out of bounds");
      }
      delegate.setPosition(index);
      super.setPosition(index);
    }
  
    @Override
    public void resetValueVector(T vector) {
      delegate.resetValueVector(vector);
    }
  
    @Override
    public T getVector() {
      return delegate.getVector();
    }
  }
  