| 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.om.types.ATypeTag; |
| import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| 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.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 CreatePolygonDescriptor extends AbstractScalarFunctionDynamicDescriptor { |
| |
| private static final long serialVersionUID = 1L; |
| public final static FunctionIdentifier FID = new FunctionIdentifier(FunctionConstants.ASTERIX_NS, "create-polygon", |
| FunctionIdentifier.VARARGS, true); |
| |
| @Override |
| public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException { |
| return new IEvaluatorFactory() { |
| private static final long serialVersionUID = 1L; |
| |
| private DataOutput out; |
| private ArrayBackedValueStorage outInput; |
| |
| @Override |
| public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException { |
| |
| final IEvaluator[] argEvals = new IEvaluator[args.length]; |
| out = output.getDataOutput(); |
| |
| outInput = new ArrayBackedValueStorage(); |
| |
| for (int i = 0; i < args.length; i++) { |
| argEvals[i] = args[i].createEvaluator(outInput); |
| } |
| |
| return new IEvaluator() { |
| |
| @Override |
| public void evaluate(IFrameTupleReference tuple) throws AlgebricksException { |
| try { |
| out.writeByte(ATypeTag.POLYGON.serialize()); |
| out.writeShort(args.length); |
| } catch (IOException e) { |
| throw new AlgebricksException(e); |
| } |
| |
| for (int i = 0; i < argEvals.length; i++) { |
| outInput.reset(); |
| argEvals[i].evaluate(tuple); |
| try { |
| out.write(outInput.getBytes(), outInput.getStartIndex() + 1, outInput.getLength() - 1); |
| } catch (IOException e) { |
| throw new AlgebricksException(e); |
| } |
| } |
| } |
| }; |
| } |
| }; |
| } |
| |
| @Override |
| public FunctionIdentifier getIdentifier() { |
| return FID; |
| } |
| |
| } |