| package edu.uci.ics.asterix.runtime.evaluators.functions; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import edu.uci.ics.asterix.common.exceptions.AsterixException; |
| import edu.uci.ics.asterix.formats.nontagged.AqlSerializerDeserializerProvider; |
| import edu.uci.ics.asterix.om.base.ANull; |
| import edu.uci.ics.asterix.om.functions.AsterixBuiltinFunctions; |
| 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.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor; |
| import edu.uci.ics.asterix.runtime.evaluators.common.AsterixListAccessor; |
| 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.data.std.api.IDataOutputProvider; |
| import edu.uci.ics.hyracks.data.std.primitive.UTF8StringPointable; |
| import edu.uci.ics.hyracks.data.std.util.ArrayBackedValueStorage; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference; |
| import edu.uci.ics.hyracks.dataflow.common.data.util.StringUtils; |
| |
| /** |
| * @author Xiaoyu Ma |
| */ |
| public class StringConcatDescriptor extends AbstractScalarFunctionDynamicDescriptor { |
| |
| private static final long serialVersionUID = 1L; |
| public static final IFunctionDescriptorFactory FACTORY = new IFunctionDescriptorFactory() { |
| public IFunctionDescriptor createFunctionDescriptor() { |
| return new StringConcatDescriptor(); |
| } |
| }; |
| |
| @Override |
| public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) { |
| return new ICopyEvaluatorFactory() { |
| |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException { |
| return new ICopyEvaluator() { |
| |
| private final AsterixListAccessor listAccessor = new AsterixListAccessor(); |
| private final DataOutput out = output.getDataOutput(); |
| private final ICopyEvaluatorFactory listEvalFactory = args[0]; |
| private final ArrayBackedValueStorage outInputList = new ArrayBackedValueStorage(); |
| private final ICopyEvaluator evalList = listEvalFactory.createEvaluator(outInputList); |
| @SuppressWarnings("unchecked") |
| private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(BuiltinType.ANULL); |
| |
| @Override |
| public void evaluate(IFrameTupleReference tuple) throws AlgebricksException { |
| try { |
| outInputList.reset(); |
| evalList.evaluate(tuple); |
| byte[] listBytes = outInputList.getByteArray(); |
| try { |
| listAccessor.reset(listBytes, 0); |
| } catch (AsterixException e) { |
| throw new AlgebricksException(e); |
| } |
| try { |
| // calculate length first |
| int utf8Len = 0; |
| for (int i = 0; i < listAccessor.size(); i++) { |
| int itemOffset = listAccessor.getItemOffset(i); |
| ATypeTag itemType = listAccessor.getItemType(itemOffset); |
| if (itemType != ATypeTag.STRING) { |
| if (itemType == ATypeTag.NULL) { |
| nullSerde.serialize(ANull.NULL, out); |
| return; |
| } |
| throw new AlgebricksException("Unsupported type " + itemType |
| + " in list passed to string-concat function."); |
| } |
| utf8Len += UTF8StringPointable.getUTFLength(listBytes, itemOffset); |
| } |
| out.writeByte(ATypeTag.STRING.serialize()); |
| StringUtils.writeUTF8Len(utf8Len, out); |
| for (int i = 0; i < listAccessor.size(); i++) { |
| int itemOffset = listAccessor.getItemOffset(i); |
| utf8Len = UTF8StringPointable.getUTFLength(listBytes, itemOffset); |
| for (int j = 0; j < utf8Len; j++) { |
| out.writeByte(listBytes[2 + itemOffset + j]); |
| } |
| } |
| } catch (AsterixException ex) { |
| throw new AlgebricksException(ex); |
| } |
| } catch (IOException e1) { |
| throw new AlgebricksException(e1.getMessage()); |
| } |
| } |
| }; |
| } |
| }; |
| } |
| |
| @Override |
| public FunctionIdentifier getIdentifier() { |
| return AsterixBuiltinFunctions.STRING_CONCAT; |
| } |
| } |