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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.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.IEvaluator;
import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
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, true);
@Override
public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
return new IEvaluatorFactory() {
private static final long serialVersionUID = 1L;
@Override
public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
return new IEvaluator() {
private DataOutput out = output.getDataOutput();
private ArrayBackedValueStorage outInput0 = new ArrayBackedValueStorage();
private ArrayBackedValueStorage outInput1 = new ArrayBackedValueStorage();
private IEvaluator eval0 = args[0].createEvaluator(outInput0);
private IEvaluator 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.getBytes();
byte[] bytes1 = outInput1.getBytes();
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.getBytes(),
APointSerializerDeserializer.getCoordinateOffset(Coordinate.X));
double y1 = ADoubleSerializerDeserializer.getDouble(outInput0.getBytes(),
APointSerializerDeserializer.getCoordinateOffset(Coordinate.Y));
double x2 = ADoubleSerializerDeserializer.getDouble(outInput1.getBytes(),
APointSerializerDeserializer.getCoordinateOffset(Coordinate.X));
double y2 = ADoubleSerializerDeserializer.getDouble(outInput1.getBytes(),
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;
}
}