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.asterix.column.assembler;
  
  import org.apache.asterix.column.metadata.schema.AbstractSchemaNode;
  import org.apache.asterix.column.metadata.schema.UnionSchemaNode;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  
  public class ArrayWithUnionValueAssembler extends ArrayValueAssembler {
      private final int numberOfUnionChildren;
      private int numberOfAddedValues;
      private boolean nonMissingValueAdded;
  
      ArrayWithUnionValueAssembler(int level, AssemblerInfo info, int firstValueIndex, AbstractSchemaNode itemNode) {
          super(level, info, firstValueIndex);
          this.numberOfUnionChildren = ((UnionSchemaNode) itemNode).getChildren().size();
      }
  
      @Override
      void reset() {
          numberOfAddedValues = 0;
          nonMissingValueAdded = false;
          super.reset();
      }
  
      @Override
      void addValue(AbstractValueAssembler value) throws HyracksDataException {
          nonMissingValueAdded = true;
          numberOfAddedValues++;
          super.addValue(value);
          if (numberOfAddedValues == numberOfUnionChildren) {
              // Completed a chunk; since we saw a non-missing, just reset the counters
              nonMissingValueAdded = false;
              numberOfAddedValues = 0;
          }
      }
  
      @Override
      void addNull(AbstractValueAssembler value) throws HyracksDataException {
          nonMissingValueAdded = true;
          numberOfAddedValues++;
          super.addNull(value);
          if (numberOfAddedValues == numberOfUnionChildren) {
              // Completed a chunk; since we saw a non-missing, just reset the counters
              nonMissingValueAdded = false;
              numberOfAddedValues = 0;
          }
      }
  
      @Override
      void addMissing() throws HyracksDataException {
          numberOfAddedValues++;
          if (numberOfAddedValues == numberOfUnionChildren) {
              if (!nonMissingValueAdded) {
                  super.addMissing();
              }
              // Reset for the next chunk
              numberOfAddedValues = 0;
              nonMissingValueAdded = false;
          }
      }
  }