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.parser;
  
  import java.io.DataOutput;
  import java.io.IOException;
  
  import org.apache.asterix.builders.RecordBuilder;
  import org.apache.asterix.external.api.IDataParser;
  import org.apache.asterix.external.api.IRawRecord;
  import org.apache.asterix.external.api.IRecordConverter;
  import org.apache.asterix.external.api.IRecordDataParser;
  import org.apache.asterix.external.api.IRecordWithMetadataParser;
  import org.apache.asterix.external.input.record.RecordWithMetadataAndPK;
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.AMutableString;
  import org.apache.asterix.om.base.AString;
  import org.apache.asterix.om.types.ARecordType;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.util.ArrayBackedValueStorage;
  import org.apache.hyracks.dataflow.common.comm.io.ArrayTupleBuilder;
  
  public class RecordWithMetadataParser<T, O> implements IRecordWithMetadataParser<T> {
  
      private final IRecordConverter<T, RecordWithMetadataAndPK<O>> converter;
      private RecordWithMetadataAndPK<O> rwm;
      private final IRecordDataParser<O> recordParser;
      private final ARecordType metaType;
      private final RecordBuilder metaBuilder;
      private final ArrayBackedValueStorage[] metaFieldsNamesBuffers;
      private final int numberOfMetaFields;
      @SuppressWarnings("unchecked")
      private final ISerializerDeserializer<AString> stringSerde =
              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.ASTRING);
  
      public RecordWithMetadataParser(ARecordType metaType, IRecordDataParser<O> valueParser,
              IRecordConverter<T, RecordWithMetadataAndPK<O>> converter) throws HyracksDataException {
          this.recordParser = valueParser;
          this.converter = converter;
          this.metaType = metaType;
          this.numberOfMetaFields = metaType.getFieldNames().length;
          metaBuilder = new RecordBuilder();
          metaBuilder.reset(metaType);
          metaBuilder.init();
          metaFieldsNamesBuffers = new ArrayBackedValueStorage[numberOfMetaFields];
          AMutableString str = new AMutableString(null);
          for (int i = 0; i < numberOfMetaFields; i++) {
              String name = metaType.getFieldNames()[i];
              metaFieldsNamesBuffers[i] = new ArrayBackedValueStorage();
              str.setValue(name);
              IDataParser.toBytes(str, metaFieldsNamesBuffers[i], stringSerde);
          }
      }
  
      @Override
      public boolean parse(IRawRecord<? extends T> record, DataOutput out) throws HyracksDataException {
          try {
              rwm = converter.convert(record);
              if (rwm.getRecord().size() == 0) {
                  // null record
                  out.writeByte(ATypeTag.SERIALIZED_MISSING_TYPE_TAG);
                  return true;
              } else {
                  return recordParser.parse(rwm.getRecord(), out);
              }
          } catch (IOException e) {
              throw HyracksDataException.create(e);
          }
      }
  
      @Override
      public void parseMeta(DataOutput out, IRawRecord<? extends T> record) throws HyracksDataException {
          try {
              if (rwm.getRecord().size() == 0) {
                  out.writeByte(ATypeTag.SERIALIZED_MISSING_TYPE_TAG);
              } else {
                  metaBuilder.reset(metaType);
                  metaBuilder.init();
                  // parse meta-Fields
                  for (int i = 0; i < numberOfMetaFields; i++) {
                      metaBuilder.addField(i, rwm.getMetadata(i));
                  }
                  // write the meta record
                  metaBuilder.write(out, true);
              }
          } catch (IOException e) {
              throw HyracksDataException.create(e);
          }
      }
  
      @Override
      public void appendLastParsedPrimaryKeyToTuple(ArrayTupleBuilder tb) throws HyracksDataException {
          rwm.appendPrimaryKeyToTuple(tb);
      }
  }
  