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 java.io.DataOutput;
  import java.io.IOException;
  
  import org.apache.asterix.common.annotations.MissingNullInOutFunction;
  import org.apache.asterix.dataflow.data.nontagged.Coordinate;
  import org.apache.asterix.dataflow.data.nontagged.serde.ACircleSerializerDeserializer;
  import org.apache.asterix.dataflow.data.nontagged.serde.ADoubleSerializerDeserializer;
  import org.apache.asterix.dataflow.data.nontagged.serde.AInt16SerializerDeserializer;
  import org.apache.asterix.dataflow.data.nontagged.serde.ARectangleSerializerDeserializer;
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.functions.IFunctionDescriptorFactory;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.EnumDeserializer;
  import org.apache.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
  import org.apache.asterix.runtime.evaluators.common.SpatialUtils;
  import org.apache.asterix.runtime.exceptions.InvalidDataFormatException;
  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.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 SpatialAreaDescriptor extends AbstractScalarFunctionDynamicDescriptor {
  
      private static final long serialVersionUID = 1L;
      public static final IFunctionDescriptorFactory FACTORY = SpatialAreaDescriptor::new;
  
      @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() {
  
                      private final ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
                      private final DataOutput out = resultStorage.getDataOutput();
                      private final IPointable argPtr = new VoidPointable();
                      private final IScalarEvaluator eval = args[0].createScalarEvaluator(ctx);
  
                      @Override
                      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                          resultStorage.reset();
                          eval.evaluate(tuple, argPtr);
  
                          if (PointableHelper.checkAndSetMissingOrNull(result, argPtr)) {
                              return;
                          }
  
                          try {
                              byte[] bytes = argPtr.getByteArray();
                              int offset = argPtr.getStartOffset();
                              ATypeTag tag = EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(bytes[offset]);
                              double area = 0.0;
  
                              switch (tag) {
                                  case POLYGON:
                                      int numOfPoints = AInt16SerializerDeserializer.getShort(bytes, offset + 1);
  
                                      if (numOfPoints < 3) {
                                          throw new InvalidDataFormatException(sourceLoc, getIdentifier(),
                                                  ATypeTag.SERIALIZED_POLYGON_TYPE_TAG);
                                      }
                                      area = Math.abs(SpatialUtils.polygonArea(bytes, offset, numOfPoints));
                                      out.writeByte(ATypeTag.SERIALIZED_DOUBLE_TYPE_TAG);
                                      out.writeDouble(area);
                                      break;
                                  case CIRCLE:
                                      double radius = ADoubleSerializerDeserializer.getDouble(bytes,
                                              offset + 1 + ACircleSerializerDeserializer.getRadiusOffset());
                                      area = SpatialUtils.pi() * radius * radius;
                                      out.writeByte(ATypeTag.SERIALIZED_DOUBLE_TYPE_TAG);
                                      out.writeDouble(area);
                                      break;
                                  case RECTANGLE:
                                      double x1 = ADoubleSerializerDeserializer.getDouble(bytes,
                                              offset + 1 + ARectangleSerializerDeserializer
                                                      .getBottomLeftCoordinateOffset(Coordinate.X));
                                      double y1 = ADoubleSerializerDeserializer.getDouble(bytes,
                                              offset + 1 + ARectangleSerializerDeserializer
                                                      .getBottomLeftCoordinateOffset(Coordinate.Y));
  
                                      double x2 = ADoubleSerializerDeserializer.getDouble(bytes,
                                              offset + 1 + ARectangleSerializerDeserializer
                                                      .getUpperRightCoordinateOffset(Coordinate.X));
                                      double y2 = ADoubleSerializerDeserializer.getDouble(bytes,
                                              offset + 1 + ARectangleSerializerDeserializer
                                                      .getUpperRightCoordinateOffset(Coordinate.Y));
                                      area = (x2 - x1) * (y2 - y1);
                                      out.writeByte(ATypeTag.SERIALIZED_DOUBLE_TYPE_TAG);
                                      out.writeDouble(area);
                                      break;
                                  default:
                                      throw new TypeMismatchException(sourceLoc, getIdentifier(), 0, bytes[offset],
                                              ATypeTag.SERIALIZED_POLYGON_TYPE_TAG, ATypeTag.SERIALIZED_CIRCLE_TYPE_TAG,
                                              ATypeTag.SERIALIZED_RECTANGLE_TYPE_TAG);
                              }
                          } catch (IOException e) {
                              throw HyracksDataException.create(e);
                          }
                          result.set(resultStorage);
                      }
                  };
              }
          };
      }
  
      @Override
      public FunctionIdentifier getIdentifier() {
          return BuiltinFunctions.SPATIAL_AREA;
      }
  
  }
  