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.
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  /*
   * To change this template, choose Tools | Templates
   * and open the template in the editor.
   */
  package org.apache.asterix.runtime.evaluators.functions;
  
  import java.io.DataOutput;
  import java.io.IOException;
  
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.AMutableString;
  import org.apache.asterix.om.exceptions.ExceptionUtil;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.BuiltinType;
  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.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;
  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 AbstractQuadStringStringEval implements IScalarEvaluator {
  
      private ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
      private DataOutput dout = resultStorage.getDataOutput();
      private IPointable ptr0 = new VoidPointable();
      private IPointable ptr1 = new VoidPointable();
      private IPointable ptr2 = new VoidPointable();
      private IPointable ptr3 = new VoidPointable();
      private IScalarEvaluator eval0;
      private IScalarEvaluator eval1;
      private IScalarEvaluator eval2;
      private IScalarEvaluator eval3;
  
      protected final FunctionIdentifier funcID;
      protected final SourceLocation sourceLoc;
  
      private AMutableString resultBuffer = new AMutableString("");
      @SuppressWarnings("rawtypes")
      private ISerializerDeserializer strSerde =
              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.ASTRING);
  
      private final IEvaluatorContext ctx;
      private final UTF8StringPointable strPtr0 = new UTF8StringPointable();
      private final UTF8StringPointable strPtr1 = new UTF8StringPointable();
      private final UTF8StringPointable strPtr2 = new UTF8StringPointable();
      private final UTF8StringPointable strPtr3 = new UTF8StringPointable();
  
      public AbstractQuadStringStringEval(IEvaluatorContext context, IScalarEvaluatorFactory eval0,
              IScalarEvaluatorFactory eval1, IScalarEvaluatorFactory eval2, IScalarEvaluatorFactory eval3,
              FunctionIdentifier funcID, SourceLocation sourceLoc) throws HyracksDataException {
          this.ctx = context;
          this.eval0 = eval0.createScalarEvaluator(context);
          this.eval1 = eval1.createScalarEvaluator(context);
          this.eval2 = eval2.createScalarEvaluator(context);
          this.eval3 = eval3.createScalarEvaluator(context);
          this.funcID = funcID;
          this.sourceLoc = sourceLoc;
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
          eval0.evaluate(tuple, ptr0);
          eval1.evaluate(tuple, ptr1);
          eval2.evaluate(tuple, ptr2);
          eval3.evaluate(tuple, ptr3);
  
          if (PointableHelper.checkAndSetMissingOrNull(result, ptr0, ptr1, ptr2, ptr3)) {
              return;
          }
  
          if (!processArgument(0, ptr0, strPtr0) || !processArgument(1, ptr1, strPtr1)
                  || !processArgument(2, ptr2, strPtr2) || !processArgument(3, ptr3, strPtr3)) {
              PointableHelper.setNull(result);
              return;
          }
  
          resultStorage.reset();
          try {
              String res = compute(strPtr0, strPtr1, strPtr2, strPtr3);
              resultBuffer.setValue(res);
              strSerde.serialize(resultBuffer, dout);
          } catch (IOException e) {
              throw HyracksDataException.create(e);
          }
          result.set(resultStorage);
      }
  
      protected boolean processArgument(int argIdx, IPointable argPtr, UTF8StringPointable outStrPtr)
              throws HyracksDataException {
          byte[] bytes = argPtr.getByteArray();
          int start = argPtr.getStartOffset();
          // Type check.
          if (bytes[start] != ATypeTag.SERIALIZED_STRING_TYPE_TAG) {
              ExceptionUtil.warnTypeMismatch(ctx, sourceLoc, funcID, bytes[start], argIdx, ATypeTag.STRING);
              return false;
          }
          int len = argPtr.getLength();
          outStrPtr.set(bytes, start + 1, len);
          return true;
      }
  
      protected abstract String compute(UTF8StringPointable strPtr1st, UTF8StringPointable strPtr2nd,
              UTF8StringPointable strPtr3rd, UTF8StringPointable strPtr4th) throws IOException;
  }
  