| package edu.uci.ics.asterix.runtime.evaluators.common; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import edu.uci.ics.asterix.common.exceptions.AsterixException; |
| import edu.uci.ics.asterix.dataflow.data.nontagged.serde.ARecordSerializerDeserializer; |
| import edu.uci.ics.asterix.formats.nontagged.AqlSerializerDeserializerProvider; |
| import edu.uci.ics.asterix.om.base.ANull; |
| import edu.uci.ics.asterix.om.types.ARecordType; |
| import edu.uci.ics.asterix.om.types.ATypeTag; |
| import edu.uci.ics.asterix.om.types.AUnionType; |
| import edu.uci.ics.asterix.om.types.BuiltinType; |
| import edu.uci.ics.asterix.om.types.EnumDeserializer; |
| import edu.uci.ics.asterix.om.types.IAType; |
| import edu.uci.ics.asterix.om.util.NonTaggedFormatUtil; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory; |
| import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer; |
| 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; |
| import edu.uci.ics.hyracks.dataflow.common.data.marshalling.IntegerSerializerDeserializer; |
| |
| public class FieldAccessByIndexEvalFactory implements ICopyEvaluatorFactory { |
| |
| private static final long serialVersionUID = 1L; |
| |
| private ICopyEvaluatorFactory recordEvalFactory; |
| private ICopyEvaluatorFactory fieldIndexEvalFactory; |
| private int nullBitmapSize; |
| private ARecordType recordType; |
| private final static byte SER_NULL_TYPE_TAG = ATypeTag.NULL.serialize(); |
| private final static byte SER_RECORD_TYPE_TAG = ATypeTag.RECORD.serialize(); |
| |
| public FieldAccessByIndexEvalFactory(ICopyEvaluatorFactory recordEvalFactory, ICopyEvaluatorFactory fieldIndexEvalFactory, |
| ARecordType recordType) { |
| this.recordEvalFactory = recordEvalFactory; |
| this.fieldIndexEvalFactory = fieldIndexEvalFactory; |
| this.recordType = recordType; |
| if (NonTaggedFormatUtil.hasNullableField(recordType)) |
| this.nullBitmapSize = (int) Math.ceil(recordType.getFieldNames().length / 8.0); |
| else |
| this.nullBitmapSize = 0; |
| |
| } |
| |
| @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 = recordEvalFactory.createEvaluator(outInput0); |
| private ICopyEvaluator eval1 = fieldIndexEvalFactory.createEvaluator(outInput1); |
| @SuppressWarnings("unchecked") |
| private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(BuiltinType.ANULL); |
| private int fieldIndex; |
| private int fieldValueOffset; |
| private int fieldValueLength; |
| private IAType fieldValueType; |
| private ATypeTag fieldValueTypeTag = ATypeTag.NULL; |
| |
| @Override |
| public void evaluate(IFrameTupleReference tuple) throws AlgebricksException { |
| try { |
| outInput0.reset(); |
| eval0.evaluate(tuple); |
| outInput1.reset(); |
| eval1.evaluate(tuple); |
| byte[] serRecord = outInput0.getByteArray(); |
| |
| if (serRecord[0] == SER_NULL_TYPE_TAG) { |
| nullSerde.serialize(ANull.NULL, out); |
| return; |
| } |
| |
| if (serRecord[0] != SER_RECORD_TYPE_TAG) { |
| throw new AlgebricksException("Field accessor is not defined for values of type " |
| + EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(serRecord[0])); |
| } |
| |
| fieldIndex = IntegerSerializerDeserializer.getInt(outInput1.getByteArray(), 1); |
| fieldValueOffset = ARecordSerializerDeserializer.getFieldOffsetById(serRecord, fieldIndex, |
| nullBitmapSize, recordType.isOpen()); |
| |
| if (fieldValueOffset == 0) { |
| // the field is null, we checked the null bit map |
| out.writeByte(SER_NULL_TYPE_TAG); |
| return; |
| } |
| |
| fieldValueType = recordType.getFieldTypes()[fieldIndex]; |
| if (fieldValueType.getTypeTag().equals(ATypeTag.UNION)) { |
| if (NonTaggedFormatUtil.isOptionalField((AUnionType) fieldValueType)) { |
| fieldValueTypeTag = ((AUnionType) fieldValueType).getUnionList() |
| .get(NonTaggedFormatUtil.OPTIONAL_TYPE_INDEX_IN_UNION_LIST).getTypeTag(); |
| fieldValueLength = NonTaggedFormatUtil.getFieldValueLength(serRecord, fieldValueOffset, |
| fieldValueTypeTag, false); |
| out.writeByte(fieldValueTypeTag.serialize()); |
| } else { |
| // union .. the general case |
| throw new NotImplementedException(); |
| } |
| } else { |
| fieldValueTypeTag = fieldValueType.getTypeTag(); |
| fieldValueLength = NonTaggedFormatUtil.getFieldValueLength(serRecord, fieldValueOffset, |
| fieldValueTypeTag, false); |
| out.writeByte(fieldValueTypeTag.serialize()); |
| } |
| out.write(serRecord, fieldValueOffset, fieldValueLength); |
| |
| } catch (IOException e) { |
| throw new AlgebricksException(e); |
| } catch (AsterixException e) { |
| throw new AlgebricksException(e); |
| } |
| } |
| }; |
| } |
| |
| } |