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 org.apache.asterix.dataflow.data.common.ILogicalBinaryComparator;
  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.exceptions.HyracksDataException;
  import org.apache.hyracks.api.exceptions.SourceLocation;
  import org.apache.hyracks.data.std.api.IPointable;
  
  public abstract class AbstractIfEqualsEvaluator extends AbstractComparisonEvaluator {
  
      AbstractIfEqualsEvaluator(IScalarEvaluatorFactory evalLeftFactory, IAType leftType,
              IScalarEvaluatorFactory evalRightFactory, IAType rightType, IEvaluatorContext ctx, SourceLocation sourceLoc)
              throws HyracksDataException {
          super(evalLeftFactory, leftType, evalRightFactory, rightType, ctx, sourceLoc, true, false);
      }
  
      @Override
      protected void evaluateImpl(IPointable result) throws HyracksDataException {
          if (compare() == ILogicalBinaryComparator.Result.EQ) {
              resultStorage.reset();
              writeEqualsResult();
              result.set(resultStorage);
          } else {
              result.set(argLeft);
          }
      }
  
      protected abstract void writeEqualsResult() throws HyracksDataException;
  }
  