| package edu.uci.ics.asterix.runtime.evaluators.functions; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import edu.uci.ics.asterix.builders.RecordBuilder; |
| import edu.uci.ics.asterix.common.functions.FunctionConstants; |
| import edu.uci.ics.asterix.om.types.ARecordType; |
| import edu.uci.ics.asterix.om.types.ATypeTag; |
| import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier; |
| import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException; |
| 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 OpenRecordConstructorDescriptor extends AbstractScalarFunctionDynamicDescriptor { |
| |
| protected static final FunctionIdentifier FID_OPEN = new FunctionIdentifier(FunctionConstants.ASTERIX_NS, |
| "open-record-constructor", FunctionIdentifier.VARARGS, true); |
| |
| private static final long serialVersionUID = 1L; |
| private ARecordType recType; |
| private boolean[] openFields; |
| |
| public void reset(ARecordType recType, boolean[] openFields) { |
| this.recType = recType; |
| this.openFields = openFields; |
| } |
| |
| @Override |
| public FunctionIdentifier getIdentifier() { |
| return FID_OPEN; |
| } |
| |
| @Override |
| public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) { |
| return new IEvaluatorFactory() { |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException { |
| int n = args.length / 2; |
| final IEvaluator[] evalNames = new IEvaluator[n]; |
| final IEvaluator[] evalFields = new IEvaluator[n]; |
| final ArrayBackedValueStorage fieldNameBuffer = new ArrayBackedValueStorage(); |
| final ArrayBackedValueStorage fieldValueBuffer = new ArrayBackedValueStorage(); |
| for (int i = 0; i < n; i++) { |
| evalNames[i] = args[2 * i].createEvaluator(fieldNameBuffer); |
| evalFields[i] = args[2 * i + 1].createEvaluator(fieldValueBuffer); |
| } |
| final DataOutput out = output.getDataOutput(); |
| return new IEvaluator() { |
| private RecordBuilder recBuilder = new RecordBuilder(); |
| private int closedFieldId; |
| private boolean first = true; |
| |
| @Override |
| public void evaluate(IFrameTupleReference tuple) throws AlgebricksException { |
| try { |
| closedFieldId = 0; |
| if (first) { |
| first = false; |
| recBuilder.reset(recType); |
| } |
| recBuilder.init(); |
| for (int i = 0; i < evalFields.length; i++) { |
| fieldValueBuffer.reset(); |
| evalFields[i].evaluate(tuple); |
| if (openFields[i]) { |
| fieldNameBuffer.reset(); |
| evalNames[i].evaluate(tuple); |
| recBuilder.addField(fieldNameBuffer, fieldValueBuffer); |
| } else { |
| if (fieldValueBuffer.getBytes()[0] != ATypeTag.NULL.serialize()) { |
| recBuilder.addField(closedFieldId, fieldValueBuffer); |
| } |
| closedFieldId++; |
| } |
| } |
| recBuilder.write(out, true); |
| } catch (IOException ioe) { |
| throw new AlgebricksException(ioe); |
| } |
| } |
| }; |
| } |
| }; |
| } |
| } |