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.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.pointables.nonvisitor.ARecordPointable;
  import org.apache.asterix.om.types.ARecordType;
  import org.apache.asterix.om.types.ATypeTag;
  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.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 GetRecordFieldsEvalFactory implements IScalarEvaluatorFactory {
  
      private static final long serialVersionUID = 1L;
  
      private IScalarEvaluatorFactory recordEvalFactory;
      private final ARecordType recordType;
      private final SourceLocation sourceLoc;
  
      public GetRecordFieldsEvalFactory(IScalarEvaluatorFactory recordEvalFactory, ARecordType recordType,
              SourceLocation sourceLoc) {
          this.recordEvalFactory = recordEvalFactory;
          this.recordType = recordType;
          this.sourceLoc = sourceLoc;
      }
  
      @Override
      public IScalarEvaluator createScalarEvaluator(final IEvaluatorContext ctx) throws HyracksDataException {
          return new IScalarEvaluator() {
  
              private final ARecordPointable recordPointable = ARecordPointable.FACTORY.createPointable();
              private IPointable inputArg0 = new VoidPointable();
              private IScalarEvaluator eval0 = recordEvalFactory.createScalarEvaluator(ctx);
              private ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
              private DataOutput out = resultStorage.getDataOutput();
              private RecordFieldsUtil rfu = new RecordFieldsUtil();
  
              @Override
              public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                  resultStorage.reset();
                  eval0.evaluate(tuple, inputArg0);
  
                  if (PointableHelper.checkAndSetMissingOrNull(result, inputArg0)) {
                      return;
                  }
  
                  byte[] data = inputArg0.getByteArray();
                  int offset = inputArg0.getStartOffset();
                  int len = inputArg0.getLength();
  
                  if (data[offset] != ATypeTag.SERIALIZED_RECORD_TYPE_TAG) {
                      throw new TypeMismatchException(sourceLoc, BuiltinFunctions.GET_RECORD_FIELDS, 0, data[offset],
                              ATypeTag.SERIALIZED_RECORD_TYPE_TAG);
                  }
  
                  recordPointable.set(data, offset, len);
                  try {
                      rfu.processRecord(recordPointable, recordType, out, 0);
                  } catch (IOException e) {
                      throw HyracksDataException.create(e);
                  }
                  result.set(resultStorage);
              }
          };
      }
  }
  