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;
  
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.AMutableString;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  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;
  import org.apache.hyracks.data.std.primitive.UTF8StringPointable;
  
  public abstract class AbstractTripleStringStringEval extends AbstractTripleStringEval {
  
      @SuppressWarnings("rawtypes")
      private final ISerializerDeserializer stringSerde =
              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.ASTRING);
      private final AMutableString resultValue = new AMutableString("");
  
      public AbstractTripleStringStringEval(IEvaluatorContext context, IScalarEvaluatorFactory eval0,
              IScalarEvaluatorFactory eval1, IScalarEvaluatorFactory eval2, FunctionIdentifier funcID,
              SourceLocation sourceLoc) throws HyracksDataException {
          super(context, eval0, eval1, eval2, funcID, sourceLoc);
      }
  
      @SuppressWarnings("unchecked")
      @Override
      protected void process(UTF8StringPointable first, UTF8StringPointable second, UTF8StringPointable thrid,
              IPointable result) throws HyracksDataException {
          resultValue.setValue(compute(first, second, thrid));
          stringSerde.serialize(resultValue, dout);
          result.set(resultStorage);
      }
  
      /**
       * Computes a string value from three input strings.
       *
       * @param first
       *            , the first input argument.
       * @param second
       *            , the second input argument.
       * @param third
       *            , the second input argument.
       * @return a string value.
       * @throws HyracksDataException
       */
      protected abstract String compute(UTF8StringPointable first, UTF8StringPointable second, UTF8StringPointable third)
              throws HyracksDataException;
  }
  