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.comparisons;
  
  import static org.apache.asterix.om.types.ATypeTag.VALUE_TYPE_MAPPING;
  
  import org.apache.asterix.dataflow.data.common.ILogicalBinaryComparator.Result;
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.ABoolean;
  import org.apache.asterix.om.exceptions.ExceptionUtil;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.asterix.om.types.IAType;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
  import org.apache.hyracks.api.context.IEvaluatorContext;
  import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.exceptions.SourceLocation;
  import org.apache.hyracks.data.std.api.IPointable;
  
  public abstract class AbstractValueComparisonEvaluator extends AbstractComparisonEvaluator {
      @SuppressWarnings("unchecked")
      protected final ISerializerDeserializer<ABoolean> serde =
              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.ABOOLEAN);
  
      public AbstractValueComparisonEvaluator(IScalarEvaluatorFactory evalLeftFactory, IAType leftType,
              IScalarEvaluatorFactory evalRightFactory, IAType rightType, IEvaluatorContext ctx, SourceLocation sourceLoc,
              boolean isEquality) throws HyracksDataException {
          super(evalLeftFactory, leftType, evalRightFactory, rightType, ctx, sourceLoc, isEquality, true);
      }
  
      @Override
      protected void evaluateImpl(IPointable result) throws HyracksDataException {
          Result comparisonResult = compare();
          switch (comparisonResult) {
              case MISSING:
                  writeMissing(result);
                  break;
              case NULL:
                  writeNull(result);
                  break;
              case INCOMPARABLE:
                  ExceptionUtil.warnIncomparableTypes(ctx, sourceLoc, VALUE_TYPE_MAPPING[argLeft.getTag()],
                          VALUE_TYPE_MAPPING[argRight.getTag()]);
                  handleIncomparable(result);
                  break;
              default:
                  resultStorage.reset();
                  ABoolean b = ABoolean.valueOf(getComparisonResult(comparisonResult));
                  serde.serialize(b, out);
                  result.set(resultStorage);
          }
      }
  
      protected abstract boolean getComparisonResult(Result r);
  
      protected abstract void handleIncomparable(IPointable result) throws HyracksDataException;
  
  }
  