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.runtime.evaluators.functions.records;
  
  import java.io.DataOutput;
  import java.io.IOException;
  
  import org.apache.asterix.dataflow.data.nontagged.serde.ARecordSerializerDeserializer;
  import org.apache.asterix.formats.nontagged.BinaryComparatorFactoryProvider;
  import org.apache.asterix.formats.nontagged.BinaryHashFunctionFactoryProvider;
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.types.ARecordType;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.AUnionType;
  import org.apache.asterix.om.types.EnumDeserializer;
  import org.apache.asterix.om.types.IAType;
  import org.apache.asterix.om.types.runtime.RuntimeRecordTypeInfo;
  import org.apache.asterix.om.utils.NonTaggedFormatUtil;
  import org.apache.asterix.om.utils.RecordUtil;
  import org.apache.asterix.runtime.evaluators.functions.PointableHelper;
  import org.apache.asterix.runtime.exceptions.TypeMismatchException;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
  import org.apache.hyracks.api.context.IEvaluatorContext;
  import org.apache.hyracks.api.dataflow.value.IBinaryComparator;
  import org.apache.hyracks.api.dataflow.value.IBinaryHashFunction;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.exceptions.SourceLocation;
  import org.apache.hyracks.data.std.api.IPointable;
  import org.apache.hyracks.data.std.primitive.VoidPointable;
  import org.apache.hyracks.data.std.util.ArrayBackedValueStorage;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  
  public class GetRecordFieldValueEvalFactory implements IScalarEvaluatorFactory {
  
      private static final long serialVersionUID = 1L;
  
      private IScalarEvaluatorFactory recordEvalFactory;
      private IScalarEvaluatorFactory fldNameEvalFactory;
      private final ARecordType recordType;
      private final SourceLocation sourceLoc;
  
      public GetRecordFieldValueEvalFactory(IScalarEvaluatorFactory recordEvalFactory,
              IScalarEvaluatorFactory fldNameEvalFactory, ARecordType recordType, SourceLocation sourceLoc) {
          this.recordEvalFactory = recordEvalFactory;
          this.fldNameEvalFactory = fldNameEvalFactory;
          this.recordType = recordType;
          this.sourceLoc = sourceLoc;
      }
  
      @Override
      public IScalarEvaluator createScalarEvaluator(final IEvaluatorContext ctx) throws HyracksDataException {
          return new IScalarEvaluator() {
  
              private final IBinaryHashFunction fieldNameHashFunction =
                      BinaryHashFunctionFactoryProvider.UTF8STRING_POINTABLE_INSTANCE.createBinaryHashFunction();
              private final IBinaryComparator fieldNameComparator =
                      BinaryComparatorFactoryProvider.UTF8STRING_POINTABLE_INSTANCE.createBinaryComparator();
              private final ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
              private final DataOutput out = resultStorage.getDataOutput();
  
              private final IPointable inputArg0 = new VoidPointable();
              private final IPointable inputArg1 = new VoidPointable();
              private final IScalarEvaluator recordEval = recordEvalFactory.createScalarEvaluator(ctx);
              private final IScalarEvaluator fieldNameEval = fldNameEvalFactory.createScalarEvaluator(ctx);
              private final RuntimeRecordTypeInfo recTypeInfo = new RuntimeRecordTypeInfo();
  
              {
                  recTypeInfo.reset(recordType);
              }
  
              @Override
              public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                  try {
                      resultStorage.reset();
                      recordEval.evaluate(tuple, inputArg0);
                      fieldNameEval.evaluate(tuple, inputArg1);
  
                      if (PointableHelper.checkAndSetMissingOrNull(result, inputArg0, inputArg1)) {
                          return;
                      }
                      byte[] serFldName = inputArg1.getByteArray();
                      int serFldNameOffset = inputArg1.getStartOffset();
                      int serFldNameLen = inputArg1.getLength();
                      if (serFldName[serFldNameOffset] != ATypeTag.SERIALIZED_STRING_TYPE_TAG) {
                          throw new TypeMismatchException(sourceLoc, BuiltinFunctions.GET_RECORD_FIELD_VALUE, 0,
                                  serFldName[serFldNameOffset], ATypeTag.SERIALIZED_STRING_TYPE_TAG);
                      }
  
                      byte[] serRecord = inputArg0.getByteArray();
                      int serRecordOffset = inputArg0.getStartOffset();
                      int serRecordLen = inputArg0.getLength();
                      if (serRecord[serRecordOffset] != ATypeTag.SERIALIZED_RECORD_TYPE_TAG) {
                          throw new TypeMismatchException(sourceLoc, BuiltinFunctions.GET_RECORD_FIELD_VALUE, 0,
                                  serRecord[serRecordOffset], ATypeTag.SERIALIZED_RECORD_TYPE_TAG);
                      }
  
                      int subFieldOffset = -1;
                      int subFieldLength = -1;
  
                      // Look at closed fields first.
                      int subFieldIndex = recTypeInfo.getFieldIndex(serFldName, serFldNameOffset + 1, serFldNameLen - 1);
                      if (subFieldIndex >= 0) {
                          int nullBitmapSize = RecordUtil.computeNullBitmapSize(recordType);
  
                          subFieldOffset = ARecordSerializerDeserializer.getFieldOffsetById(serRecord, serRecordOffset,
                                  subFieldIndex, nullBitmapSize, recordType.isOpen());
                          switch (subFieldOffset) {
                              case -1:
                                  out.writeByte(ATypeTag.SERIALIZED_MISSING_TYPE_TAG);
                                  result.set(resultStorage);
                                  return;
                              case 0:
                                  out.writeByte(ATypeTag.SERIALIZED_NULL_TYPE_TAG);
                                  result.set(resultStorage);
                                  return;
                              default:
                                  IAType fieldType = recordType.getFieldTypes()[subFieldIndex];
                                  if (fieldType.getTypeTag() == ATypeTag.UNION) {
                                      fieldType = ((AUnionType) fieldType).getActualType();
                                  }
                                  ATypeTag fieldTypeTag = fieldType.getTypeTag();
                                  subFieldLength = NonTaggedFormatUtil.getFieldValueLength(serRecord, subFieldOffset,
                                          fieldTypeTag, false);
                                  // write result.
                                  out.writeByte(fieldTypeTag.serialize());
                                  out.write(serRecord, subFieldOffset, subFieldLength);
                                  result.set(resultStorage);
                                  return;
                          }
                      }
  
                      // Look at open fields.
                      subFieldOffset = ARecordSerializerDeserializer.getFieldOffsetByName(serRecord, serRecordOffset,
                              serRecordLen, serFldName, serFldNameOffset, fieldNameHashFunction, fieldNameComparator);
                      if (subFieldOffset < 0) {
                          out.writeByte(ATypeTag.SERIALIZED_MISSING_TYPE_TAG);
                          result.set(resultStorage);
                          return;
                      }
                      // Get the field length.
                      ATypeTag fieldValueTypeTag =
                              EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(serRecord[subFieldOffset]);
                      subFieldLength =
                              NonTaggedFormatUtil.getFieldValueLength(serRecord, subFieldOffset, fieldValueTypeTag, true)
                                      + 1;
                      // write result.
                      result.set(serRecord, subFieldOffset, subFieldLength);
                  } catch (IOException e) {
                      throw HyracksDataException.create(e);
                  }
              }
          };
      }
  }
  