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 static org.apache.asterix.om.types.ATypeTag.VALUE_TYPE_MAPPING;
  import static org.apache.asterix.runtime.evaluators.common.ArgumentUtils.NUMERIC_TYPES;
  
  import java.io.DataOutput;
  
  import org.apache.asterix.common.annotations.MissingNullInOutFunction;
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.AMutableDouble;
  import org.apache.asterix.om.exceptions.ExceptionUtil;
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.functions.IFunctionDescriptorFactory;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.asterix.om.types.hierachy.ATypeHierarchy;
  import org.apache.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
  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.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;
  
  @MissingNullInOutFunction
  public class NumericATan2Descriptor extends AbstractScalarFunctionDynamicDescriptor {
  
      private static final long serialVersionUID = 1L;
      public static final IFunctionDescriptorFactory FACTORY = NumericATan2Descriptor::new;
  
      @Override
      public FunctionIdentifier getIdentifier() {
          return BuiltinFunctions.NUMERIC_ATAN2;
      }
  
      @Override
      public IScalarEvaluatorFactory createEvaluatorFactory(final IScalarEvaluatorFactory[] args) {
          return new IScalarEvaluatorFactory() {
              private static final long serialVersionUID = 1L;
  
              @Override
              public IScalarEvaluator createScalarEvaluator(final IEvaluatorContext ctx) throws HyracksDataException {
                  return new IScalarEvaluator() {
                      // For inputs.
                      private final IPointable leftPtr = new VoidPointable();
                      private final IPointable rightPtr = new VoidPointable();
                      private final IScalarEvaluator evalLeft = args[0].createScalarEvaluator(ctx);
                      private final IScalarEvaluator evalRight = args[1].createScalarEvaluator(ctx);
                      private double operand0;
                      private double operand1;
  
                      // For the output.
                      private final AMutableDouble aDouble = new AMutableDouble(0.0);
                      @SuppressWarnings("rawtypes")
                      private final ISerializerDeserializer outputSerde =
                              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.ADOUBLE);
                      private final ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
                      private final DataOutput out = resultStorage.getDataOutput();
  
                      @SuppressWarnings("unchecked")
                      @Override
                      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                          resultStorage.reset();
                          evalLeft.evaluate(tuple, leftPtr);
                          evalRight.evaluate(tuple, rightPtr);
  
                          if (PointableHelper.checkAndSetMissingOrNull(result, leftPtr, rightPtr)) {
                              return;
                          }
  
                          if (checkTypeAndWarn(leftPtr, 0) || checkTypeAndWarn(rightPtr, 1)) {
                              PointableHelper.setNull(result);
                              return;
                          }
                          String funName = getIdentifier().getName();
                          operand0 = ATypeHierarchy.getDoubleValue(funName, 0, leftPtr.getByteArray(),
                                  leftPtr.getStartOffset());
                          operand1 = ATypeHierarchy.getDoubleValue(funName, 1, rightPtr.getByteArray(),
                                  rightPtr.getStartOffset());
                          aDouble.setValue(Math.atan2(operand0, operand1));
                          outputSerde.serialize(aDouble, out);
                          result.set(resultStorage);
                      }
  
                      private boolean checkTypeAndWarn(IPointable argPtr, int argIdx) {
                          byte[] data = argPtr.getByteArray();
                          int offset = argPtr.getStartOffset();
                          byte type = data[offset];
                          if (ATypeHierarchy.getTypeDomain(VALUE_TYPE_MAPPING[type]) != ATypeHierarchy.Domain.NUMERIC) {
                              ExceptionUtil.warnTypeMismatch(ctx, sourceLoc, getIdentifier(), type, argIdx,
                                      NUMERIC_TYPES);
                              return true;
                          }
                          return false;
                      }
                  };
              }
          };
      }
  }
  