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.metadata.entitytupletranslators;
  
  import java.util.ArrayList;
  import java.util.Calendar;
  import java.util.List;
  
  import org.apache.asterix.builders.UnorderedListBuilder;
  import org.apache.asterix.metadata.bootstrap.NodeGroupEntity;
  import org.apache.asterix.metadata.entities.NodeGroup;
  import org.apache.asterix.om.base.ARecord;
  import org.apache.asterix.om.base.AString;
  import org.apache.asterix.om.base.AUnorderedList;
  import org.apache.asterix.om.base.IACursor;
  import org.apache.asterix.om.types.AUnorderedListType;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.util.ArrayBackedValueStorage;
  import org.apache.hyracks.dataflow.common.data.accessors.ITupleReference;
  
  /**
   * Translates a NodeGroup metadata entity to an ITupleReference and vice versa.
   */
  public class NodeGroupTupleTranslator extends AbstractTupleTranslator<NodeGroup> {
  
      private final NodeGroupEntity nodeGroupEntity;
      protected UnorderedListBuilder listBuilder;
      protected ArrayBackedValueStorage itemValue;
  
      protected NodeGroupTupleTranslator(boolean getTuple, NodeGroupEntity nodeGroupEntity) {
          super(getTuple, nodeGroupEntity.getIndex(), nodeGroupEntity.payloadPosition());
          this.nodeGroupEntity = nodeGroupEntity;
          if (getTuple) {
              listBuilder = new UnorderedListBuilder();
              itemValue = new ArrayBackedValueStorage();
          }
      }
  
      @Override
      protected NodeGroup createMetadataEntityFromARecord(ARecord nodeGroupRecord) {
          String gpName = ((AString) nodeGroupRecord.getValueByPos(nodeGroupEntity.groupNameIndex())).getStringValue();
          IACursor cursor =
                  ((AUnorderedList) nodeGroupRecord.getValueByPos(nodeGroupEntity.nodeNamesIndex())).getCursor();
          List<String> nodeNames = new ArrayList<>();
          while (cursor.next()) {
              nodeNames.add(((AString) cursor.get()).getStringValue());
          }
          return new NodeGroup(gpName, nodeNames);
      }
  
      @Override
      public ITupleReference getTupleFromMetadataEntity(NodeGroup instance) throws HyracksDataException {
          // write the key in the first field of the tuple
          tupleBuilder.reset();
          aString.setValue(instance.getNodeGroupName());
          stringSerde.serialize(aString, tupleBuilder.getDataOutput());
          tupleBuilder.addFieldEndOffset();
  
          // write the payload in the second field of the tuple
          recordBuilder.reset(nodeGroupEntity.getRecordType());
          // write field 0
          fieldValue.reset();
          aString.setValue(instance.getNodeGroupName());
          stringSerde.serialize(aString, fieldValue.getDataOutput());
          recordBuilder.addField(nodeGroupEntity.groupNameIndex(), fieldValue);
  
          // write field 1
          listBuilder.reset(
                  (AUnorderedListType) nodeGroupEntity.getRecordType().getFieldTypes()[nodeGroupEntity.nodeNamesIndex()]);
          List<String> nodeNames = instance.getNodeNames();
          for (String nodeName : nodeNames) {
              itemValue.reset();
              aString.setValue(nodeName);
              stringSerde.serialize(aString, itemValue.getDataOutput());
              listBuilder.addItem(itemValue);
          }
          fieldValue.reset();
          listBuilder.write(fieldValue.getDataOutput(), true);
          recordBuilder.addField(nodeGroupEntity.nodeNamesIndex(), fieldValue);
  
          // write field 2
          fieldValue.reset();
          aString.setValue(Calendar.getInstance().getTime().toString());
          stringSerde.serialize(aString, fieldValue.getDataOutput());
          recordBuilder.addField(nodeGroupEntity.timestampIndex(), fieldValue);
  
          recordBuilder.write(tupleBuilder.getDataOutput(), true);
          tupleBuilder.addFieldEndOffset();
  
          tuple.reset(tupleBuilder.getFieldEndOffsets(), tupleBuilder.getByteArray());
          return tuple;
      }
  }
  