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.dataflow.data.nontagged.serde.AObjectSerializerDeserializer;
  import org.apache.asterix.om.base.ABoolean;
  import org.apache.asterix.runtime.evaluators.functions.PointableHelper;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
  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 abstract class AbstractTypeCheckEvaluator implements IScalarEvaluator {
      protected static final AObjectSerializerDeserializer aObjectSerializerDeserializer =
              AObjectSerializerDeserializer.INSTANCE;
  
      protected final ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
      protected final DataOutput out = resultStorage.getDataOutput();
      protected final IPointable argPtr = new VoidPointable();
      protected final IScalarEvaluator eval;
      protected ABoolean res;
  
      private byte acceptedTypeTag;
  
      public AbstractTypeCheckEvaluator(IScalarEvaluator argEval, byte acceptedTypeTag) {
          this.acceptedTypeTag = acceptedTypeTag;
          this.eval = argEval;
      }
  
      public AbstractTypeCheckEvaluator(IScalarEvaluator argEval) {
          this.eval = argEval;
      }
  
      @Override
      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
          eval.evaluate(tuple, argPtr);
          if (PointableHelper.checkAndSetMissingOrNull(result, argPtr)) {
              return;
          }
  
          res = isMatch(argPtr.getByteArray()[argPtr.getStartOffset()]) ? ABoolean.TRUE : ABoolean.FALSE;
          resultStorage.reset();
          aObjectSerializerDeserializer.serialize(res, out);
          result.set(resultStorage);
      }
  
      protected boolean isMatch(byte typeTag) {
          return typeTag == acceptedTypeTag;
      }
  }
  