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.external.api;
  
  import java.io.DataOutput;
  
  import org.apache.asterix.builders.IARecordBuilder;
  import org.apache.asterix.builders.OrderedListBuilder;
  import org.apache.asterix.builders.RecordBuilder;
  import org.apache.asterix.builders.UnorderedListBuilder;
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.AMutableOrderedList;
  import org.apache.asterix.om.base.AMutableRecord;
  import org.apache.asterix.om.base.AMutableUnorderedList;
  import org.apache.asterix.om.base.IACursor;
  import org.apache.asterix.om.base.IAObject;
  import org.apache.asterix.om.types.AOrderedListType;
  import org.apache.asterix.om.types.ARecordType;
  import org.apache.asterix.om.types.AUnorderedListType;
  import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.util.ArrayBackedValueStorage;
  
  public interface IDataParser {
  
      /*
       * The following two static methods are expensive. right now, they are used by RSSFeeds and
       * Twitter feed
       * TODO: Get rid of them
       */
      public static void writeRecord(AMutableRecord record, DataOutput dataOutput, IARecordBuilder recordBuilder)
              throws HyracksDataException {
          ArrayBackedValueStorage fieldValue = new ArrayBackedValueStorage();
          int numFields = record.getType().getFieldNames().length;
          for (int pos = 0; pos < numFields; pos++) {
              fieldValue.reset();
              IAObject obj = record.getValueByPos(pos);
              IDataParser.writeObject(obj, fieldValue.getDataOutput());
              recordBuilder.addField(pos, fieldValue);
          }
          recordBuilder.write(dataOutput, true);
      }
  
      @SuppressWarnings("unchecked")
      public static void writeObject(IAObject obj, DataOutput dataOutput) throws HyracksDataException {
          switch (obj.getType().getTypeTag()) {
              case OBJECT: {
                  IARecordBuilder recordBuilder = new RecordBuilder();
                  recordBuilder.reset((ARecordType) obj.getType());
                  recordBuilder.init();
                  writeRecord((AMutableRecord) obj, dataOutput, recordBuilder);
                  break;
              }
  
              case ARRAY: {
                  OrderedListBuilder listBuilder = new OrderedListBuilder();
                  listBuilder.reset((AOrderedListType) obj.getType());
                  IACursor cursor = ((AMutableOrderedList) obj).getCursor();
                  ArrayBackedValueStorage listItemValue = new ArrayBackedValueStorage();
                  while (cursor.next()) {
                      listItemValue.reset();
                      IAObject item = cursor.get();
                      writeObject(item, listItemValue.getDataOutput());
                      listBuilder.addItem(listItemValue);
                  }
                  listBuilder.write(dataOutput, true);
                  break;
              }
  
              case MULTISET: {
                  UnorderedListBuilder listBuilder = new UnorderedListBuilder();
                  listBuilder.reset((AUnorderedListType) obj.getType());
                  IACursor cursor = ((AMutableUnorderedList) obj).getCursor();
                  ArrayBackedValueStorage listItemValue = new ArrayBackedValueStorage();
                  while (cursor.next()) {
                      listItemValue.reset();
                      IAObject item = cursor.get();
                      writeObject(item, listItemValue.getDataOutput());
                      listBuilder.addItem(listItemValue);
                  }
                  listBuilder.write(dataOutput, true);
                  break;
              }
  
              default:
                  SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(obj.getType()).serialize(obj,
                          dataOutput);
                  break;
          }
      }
  
      public static <T> void toBytes(T serializable, ArrayBackedValueStorage buffer, ISerializerDeserializer<T> serde)
              throws HyracksDataException {
          buffer.reset();
          DataOutput out = buffer.getDataOutput();
          serde.serialize(serializable, out);
      }
  }
  