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.binary;
  
  import java.io.DataOutput;
  
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.hierachy.ATypeHierarchy;
  import org.apache.asterix.runtime.exceptions.TypeMismatchException;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  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;
  
  public abstract class AbstractBinaryScalarEvaluator implements IScalarEvaluator {
  
      protected ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
      protected DataOutput dataOutput = resultStorage.getDataOutput();
      protected IPointable[] pointables;
      protected IScalarEvaluator[] evaluators;
      // Function ID, for error reporting.
      protected final FunctionIdentifier funcId;
      protected final SourceLocation sourceLoc;
  
      public AbstractBinaryScalarEvaluator(IEvaluatorContext context, final IScalarEvaluatorFactory[] evaluatorFactories,
              FunctionIdentifier funcId, SourceLocation sourceLoc) throws HyracksDataException {
          pointables = new IPointable[evaluatorFactories.length];
          evaluators = new IScalarEvaluator[evaluatorFactories.length];
          for (int i = 0; i < evaluators.length; ++i) {
              pointables[i] = new VoidPointable();
              evaluators[i] = evaluatorFactories[i].createScalarEvaluator(context);
          }
          this.funcId = funcId;
          this.sourceLoc = sourceLoc;
      }
  
      protected void checkTypeMachingThrowsIfNot(ATypeTag[] expected, ATypeTag... actual) throws HyracksDataException {
          for (int i = 0; i < expected.length; i++) {
              if (expected[i] != actual[i]) {
                  if (!ATypeHierarchy.canPromote(actual[i], expected[i])
                          && !ATypeHierarchy.canPromote(expected[i], actual[i])) {
                      throw new TypeMismatchException(sourceLoc, funcId, i, actual[i].serialize(),
                              expected[i].serialize());
                  }
              }
          }
      }
  
  }
  