| package edu.uci.ics.asterix.runtime.evaluators.functions; |
| |
| import java.io.DataOutput; |
| |
| import edu.uci.ics.asterix.common.functions.FunctionConstants; |
| import edu.uci.ics.asterix.formats.nontagged.AqlSerializerDeserializerProvider; |
| import edu.uci.ics.asterix.om.base.AInt32; |
| import edu.uci.ics.asterix.om.base.AMutableInt32; |
| import edu.uci.ics.asterix.om.base.ANull; |
| 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.BuiltinType; |
| 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.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.dataflow.value.ISerializerDeserializer; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.data.std.primitive.UTF8StringPointable; |
| 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 YearDescriptor extends AbstractScalarFunctionDynamicDescriptor { |
| |
| private static final long serialVersionUID = 1L; |
| public final static FunctionIdentifier FID = new FunctionIdentifier(FunctionConstants.ASTERIX_NS, "year", 1, true); |
| private final static byte SER_NULL_TYPE_TAG = ATypeTag.NULL.serialize(); |
| private final static byte SER_STRING_TYPE_TAG = ATypeTag.STRING.serialize(); |
| public static final IFunctionDescriptorFactory FACTORY = new IFunctionDescriptorFactory() { |
| public IFunctionDescriptor createFunctionDescriptor() { |
| return new YearDescriptor(); |
| } |
| }; |
| |
| @Override |
| public FunctionIdentifier getIdentifier() { |
| return FID; |
| } |
| |
| /** |
| * Returns the 4-digit representation of a year from a string, as an int32. |
| * e.g. year('2010-10-24') = 2010 |
| */ |
| |
| @Override |
| public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) { |
| |
| return new ICopyEvaluatorFactory() { |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException { |
| final DataOutput out = output.getDataOutput(); |
| |
| return new ICopyEvaluator() { |
| private ArrayBackedValueStorage out1 = new ArrayBackedValueStorage(); |
| private ICopyEvaluator eval1 = args[0].createEvaluator(out1); |
| private AMutableInt32 m = new AMutableInt32(0); |
| @SuppressWarnings("unchecked") |
| private ISerializerDeserializer<AInt32> int32Serde = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(BuiltinType.AINT32); |
| @SuppressWarnings("unchecked") |
| private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(BuiltinType.ANULL); |
| |
| @Override |
| public void evaluate(IFrameTupleReference tuple) throws AlgebricksException { |
| try { |
| out1.reset(); |
| eval1.evaluate(tuple); |
| byte[] dateArray = out1.getByteArray(); |
| |
| if (dateArray[0] == SER_NULL_TYPE_TAG) { |
| nullSerde.serialize(ANull.NULL, out); |
| return; |
| } |
| |
| if (dateArray[0] != SER_STRING_TYPE_TAG) { |
| throw new AlgebricksException("year function can not be called on values of type" |
| + EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(dateArray[0])); |
| } |
| |
| int year = (UTF8StringPointable.charAt(dateArray, 3) - '0') * 1000 |
| + (UTF8StringPointable.charAt(dateArray, 4) - '0') * 100 |
| + (UTF8StringPointable.charAt(dateArray, 5) - '0') * 10 |
| + (UTF8StringPointable.charAt(dateArray, 6) - '0'); |
| m.setValue(year); |
| |
| int32Serde.serialize(m, out); |
| } catch (HyracksDataException e) { |
| throw new AlgebricksException(e); |
| } |
| } |
| }; |
| } |
| }; |
| } |
| |
| } |