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.common;
  
  import java.io.DataOutput;
  
  import org.apache.asterix.builders.IARecordBuilder;
  import org.apache.asterix.builders.RecordBuilder;
  import org.apache.asterix.om.types.ARecordType;
  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.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 ClosedRecordConstructorEvalFactory implements IScalarEvaluatorFactory {
  
      private static final long serialVersionUID = 1L;
  
      private IScalarEvaluatorFactory[] args;
      private ARecordType recType;
  
      public ClosedRecordConstructorEvalFactory(IScalarEvaluatorFactory[] args, ARecordType recType) {
          this.args = args;
          this.recType = recType;
      }
  
      @Override
      public String toString() {
          return "ClosedRecordConstructor";
      }
  
      @Override
      public IScalarEvaluator createScalarEvaluator(IEvaluatorContext ctx) throws HyracksDataException {
          int n = args.length / 2;
          IScalarEvaluator[] evalFields = new IScalarEvaluator[n];
          for (int i = 0; i < n; i++) {
              evalFields[i] = args[2 * i + 1].createScalarEvaluator(ctx);
          }
          return new ClosedRecordConstructorEval(recType, evalFields);
      }
  
      public static class ClosedRecordConstructorEval implements IScalarEvaluator {
          private IScalarEvaluator[] evalFields;
          private final ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
          private final DataOutput out = resultStorage.getDataOutput();
          private final IARecordBuilder recBuilder = new RecordBuilder();
          private final ARecordType recType;
          private final IPointable fieldValuePointable = new VoidPointable();
          private boolean first = true;
  
          public ClosedRecordConstructorEval(ARecordType recType, IScalarEvaluator[] evalFields) {
              this.evalFields = evalFields;
              this.recType = recType;
          }
  
          @Override
          public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
              resultStorage.reset();
              if (first) {
                  first = false;
                  recBuilder.reset(this.recType);
              }
              recBuilder.init();
              for (int i = 0; i < evalFields.length; i++) {
                  evalFields[i].evaluate(tuple, fieldValuePointable);
                  recBuilder.addField(i, fieldValuePointable);
              }
              recBuilder.write(out, true);
              result.set(resultStorage);
          }
      }
  
  }
  