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.dataflow.data.nontagged.Coordinate;
  import org.apache.asterix.dataflow.data.nontagged.serde.ADoubleSerializerDeserializer;
  import org.apache.asterix.dataflow.data.nontagged.serde.ARectangleSerializerDeserializer;
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.AMutablePoint;
  import org.apache.asterix.om.base.AMutableRectangle;
  import org.apache.asterix.om.base.ARectangle;
  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.BuiltinType;
  import org.apache.asterix.om.types.EnumDeserializer;
  import org.apache.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
  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.context.IHyracksTaskContext;
  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;
  
  public class GetIntersectionDescriptor extends AbstractScalarFunctionDynamicDescriptor {
      private static final long serialVersionUID = 1L;
  
      public static final IFunctionDescriptorFactory FACTORY = () -> new GetIntersectionDescriptor();
  
      @Override
      public FunctionIdentifier getIdentifier() {
          return BuiltinFunctions.GET_INTERSECTION;
      }
  
      @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 {
                  final IHyracksTaskContext hyracksTaskContext = ctx.getTaskContext();
  
                  return new IScalarEvaluator() {
  
                      private final ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
                      private final IPointable inputArg0 = new VoidPointable();
                      private final IPointable inputArg1 = new VoidPointable();
                      private final IScalarEvaluator eval0 = args[0].createScalarEvaluator(ctx);
                      private final IScalarEvaluator eval1 = args[1].createScalarEvaluator(ctx);
  
                      private final AMutableRectangle aRectangle =
                              new AMutableRectangle(new AMutablePoint(0.0, 0.0), new AMutablePoint(0.0, 0.0));
                      private final AMutablePoint[] aPoint = { new AMutablePoint(0, 0), new AMutablePoint(0, 0) };
  
                      @SuppressWarnings("unchecked")
                      private final ISerializerDeserializer<ARectangle> rectangleSerde =
                              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.ARECTANGLE);
  
                      @Override
                      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                          resultStorage.reset();
  
                          eval0.evaluate(tuple, inputArg0);
                          eval1.evaluate(tuple, inputArg1);
  
                          if (PointableHelper.checkAndSetMissingOrNull(result, inputArg0, inputArg1)) {
                              return;
                          }
  
                          byte[] bytes0 = inputArg0.getByteArray();
                          byte[] bytes1 = inputArg1.getByteArray();
  
                          int offset0 = inputArg0.getStartOffset();
                          int offset1 = inputArg1.getStartOffset();
  
                          ATypeTag tag0 = EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(bytes0[offset0]);
                          ATypeTag tag1 = EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(bytes1[offset1]);
  
                          if (tag0 != ATypeTag.RECTANGLE) {
                              throw new TypeMismatchException(sourceLoc, getIdentifier(), 0, bytes0[offset0],
                                      ATypeTag.SERIALIZED_RECTANGLE_TYPE_TAG);
                          }
                          if (tag1 != ATypeTag.RECTANGLE) {
                              throw new TypeMismatchException(sourceLoc, getIdentifier(), 1, bytes1[offset1],
                                      ATypeTag.SERIALIZED_RECTANGLE_TYPE_TAG);
                          }
  
                          double ax1 = ADoubleSerializerDeserializer.getDouble(bytes0, offset0 + 1
                                  + ARectangleSerializerDeserializer.getBottomLeftCoordinateOffset(Coordinate.X));
                          double ay1 = ADoubleSerializerDeserializer.getDouble(bytes0, offset0 + 1
                                  + ARectangleSerializerDeserializer.getBottomLeftCoordinateOffset(Coordinate.Y));
  
                          double ax2 = ADoubleSerializerDeserializer.getDouble(bytes0, offset0 + 1
                                  + ARectangleSerializerDeserializer.getUpperRightCoordinateOffset(Coordinate.X));
                          double ay2 = ADoubleSerializerDeserializer.getDouble(bytes0, offset0 + 1
                                  + ARectangleSerializerDeserializer.getUpperRightCoordinateOffset(Coordinate.Y));
  
                          double bx1 = ADoubleSerializerDeserializer.getDouble(bytes1, offset1 + 1
                                  + ARectangleSerializerDeserializer.getBottomLeftCoordinateOffset(Coordinate.X));
                          double by1 = ADoubleSerializerDeserializer.getDouble(bytes1, offset1 + 1
                                  + ARectangleSerializerDeserializer.getBottomLeftCoordinateOffset(Coordinate.Y));
  
                          double bx2 = ADoubleSerializerDeserializer.getDouble(bytes1, offset1 + 1
                                  + ARectangleSerializerDeserializer.getUpperRightCoordinateOffset(Coordinate.X));
                          double by2 = ADoubleSerializerDeserializer.getDouble(bytes1, offset1 + 1
                                  + ARectangleSerializerDeserializer.getUpperRightCoordinateOffset(Coordinate.Y));
  
                          // Bottom-left of the intersection rectangle
                          double ix1 = Math.max(ax1, bx1);
                          double iy1 = Math.max(ay1, by1);
  
                          // Top-right of the intersection rectangle
                          double ix2 = Math.min(ax2, bx2);
                          double iy2 = Math.min(ay2, by2);
  
                          // Update the intersection rectangle.
                          // If there is no intersection, return default rectangle [(0,0),(0,0)]
                          if ((ix1 < ix2) && (iy1 < iy2)) {
                              aPoint[0].setValue(ix1, iy1);
                              aPoint[1].setValue(ix2, iy2);
                          } else {
                              aPoint[0].setValue(0.0, 0.0);
                              aPoint[1].setValue(0.0, 0.0);
                          }
                          aRectangle.setValue(aPoint[0], aPoint[1]);
                          resultStorage.reset();
                          rectangleSerde.serialize(aRectangle, resultStorage.getDataOutput());
                          result.set(resultStorage);
                      }
                  };
              }
          };
      }
  }
  