| package edu.uci.ics.asterix.runtime.evaluators.functions; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import edu.uci.ics.asterix.common.functions.FunctionConstants; |
| import edu.uci.ics.asterix.dataflow.data.nontagged.Coordinate; |
| import edu.uci.ics.asterix.dataflow.data.nontagged.serde.ADoubleSerializerDeserializer; |
| import edu.uci.ics.asterix.dataflow.data.nontagged.serde.APointSerializerDeserializer; |
| import edu.uci.ics.asterix.om.functions.IFunctionDescriptor; |
| import edu.uci.ics.asterix.om.functions.IFunctionDescriptorFactory; |
| import edu.uci.ics.asterix.om.types.ATypeTag; |
| import edu.uci.ics.asterix.om.types.EnumDeserializer; |
| import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference; |
| |
| public class SpatialDistanceDescriptor extends AbstractScalarFunctionDynamicDescriptor { |
| |
| private static final long serialVersionUID = 1L; |
| public final static FunctionIdentifier FID = new FunctionIdentifier(FunctionConstants.ASTERIX_NS, |
| "spatial-distance", 2); |
| public static final IFunctionDescriptorFactory FACTORY = new IFunctionDescriptorFactory() { |
| public IFunctionDescriptor createFunctionDescriptor() { |
| return new SpatialDistanceDescriptor(); |
| } |
| }; |
| |
| @Override |
| public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException { |
| return new ICopyEvaluatorFactory() { |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException { |
| return new ICopyEvaluator() { |
| |
| private DataOutput out = output.getDataOutput(); |
| private ArrayBackedValueStorage outInput0 = new ArrayBackedValueStorage(); |
| private ArrayBackedValueStorage outInput1 = new ArrayBackedValueStorage(); |
| private ICopyEvaluator eval0 = args[0].createEvaluator(outInput0); |
| private ICopyEvaluator eval1 = args[1].createEvaluator(outInput1); |
| |
| @Override |
| public void evaluate(IFrameTupleReference tuple) throws AlgebricksException { |
| outInput0.reset(); |
| eval0.evaluate(tuple); |
| outInput1.reset(); |
| eval1.evaluate(tuple); |
| |
| try { |
| byte[] bytes0 = outInput0.getByteArray(); |
| byte[] bytes1 = outInput1.getByteArray(); |
| ATypeTag tag0 = EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(bytes0[0]); |
| ATypeTag tag1 = EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(bytes1[0]); |
| double distance = 0.0; |
| if (tag0 == ATypeTag.POINT) { |
| if (tag1 == ATypeTag.POINT) { |
| double x1 = ADoubleSerializerDeserializer.getDouble(outInput0.getByteArray(), |
| APointSerializerDeserializer.getCoordinateOffset(Coordinate.X)); |
| double y1 = ADoubleSerializerDeserializer.getDouble(outInput0.getByteArray(), |
| APointSerializerDeserializer.getCoordinateOffset(Coordinate.Y)); |
| double x2 = ADoubleSerializerDeserializer.getDouble(outInput1.getByteArray(), |
| APointSerializerDeserializer.getCoordinateOffset(Coordinate.X)); |
| double y2 = ADoubleSerializerDeserializer.getDouble(outInput1.getByteArray(), |
| APointSerializerDeserializer.getCoordinateOffset(Coordinate.Y)); |
| distance = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2)); |
| } else { |
| throw new NotImplementedException("spatial-distance does not support the type: " |
| + tag1 + " It is only implemented for POINT."); |
| } |
| } else { |
| throw new NotImplementedException("spatial-distance does not support the type: " + tag0 |
| + " It is only implemented for POINT."); |
| } |
| out.writeByte(ATypeTag.DOUBLE.serialize()); |
| out.writeDouble(distance); |
| } catch (HyracksDataException hde) { |
| throw new AlgebricksException(hde); |
| } catch (IOException e) { |
| throw new AlgebricksException(e); |
| } |
| } |
| }; |
| } |
| }; |
| } |
| |
| @Override |
| public FunctionIdentifier getIdentifier() { |
| return FID; |
| } |
| |
| } |