| package edu.uci.ics.asterix.runtime.evaluators.functions; |
| |
| import edu.uci.ics.asterix.common.exceptions.AsterixException; |
| import edu.uci.ics.asterix.common.functions.FunctionConstants; |
| import edu.uci.ics.asterix.dataflow.data.nontagged.serde.AOrderedListSerializerDeserializer; |
| import edu.uci.ics.asterix.formats.nontagged.AqlSerializerDeserializerProvider; |
| 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.core.algebra.functions.FunctionIdentifier; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| 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.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; |
| import edu.uci.ics.hyracks.dataflow.common.data.util.StringUtils; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| /** |
| * @author Xiaoyu Ma |
| */ |
| public class StringConcatDescriptor extends AbstractScalarFunctionDynamicDescriptor { |
| |
| private static final long serialVersionUID = 1L; |
| private final static FunctionIdentifier FID = new FunctionIdentifier(FunctionConstants.ASTERIX_NS, "string-concat", |
| 1); |
| public static final IFunctionDescriptorFactory FACTORY = new IFunctionDescriptorFactory() { |
| public IFunctionDescriptor createFunctionDescriptor() { |
| return new StringConcatDescriptor(); |
| } |
| }; |
| private final static byte SER_NULL_TYPE_TAG = ATypeTag.NULL.serialize(); |
| private final static byte SER_ORDEREDLIST_TYPE_TAG = ATypeTag.ORDEREDLIST.serialize(); |
| private final byte stringTypeTag = ATypeTag.STRING.serialize(); |
| |
| @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 DataOutput out = output.getDataOutput(); |
| private ICopyEvaluatorFactory listEvalFactory = args[0]; |
| private ArrayBackedValueStorage outInputList = new ArrayBackedValueStorage(); |
| private 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[] serOrderedList = outInputList.getByteArray(); |
| if (serOrderedList[0] == SER_NULL_TYPE_TAG) { |
| nullSerde.serialize(ANull.NULL, out); |
| return; |
| } |
| if (serOrderedList[0] != SER_ORDEREDLIST_TYPE_TAG) { |
| throw new AlgebricksException("Expects String List." |
| + EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(serOrderedList[0])); |
| } |
| int size = AOrderedListSerializerDeserializer.getNumberOfItems(serOrderedList); |
| try { |
| // calculate length first |
| int utf_8_len = 0; |
| for (int i = 0; i < size; i++) { |
| int itemOffset = AOrderedListSerializerDeserializer |
| .getItemOffset(serOrderedList, i); |
| utf_8_len += UTF8StringPointable.getUTFLength(serOrderedList, itemOffset); |
| } |
| out.writeByte(stringTypeTag); |
| StringUtils.writeUTF8Len(utf_8_len, out); |
| for (int i = 0; i < size; i++) { |
| int itemOffset = AOrderedListSerializerDeserializer |
| .getItemOffset(serOrderedList, i); |
| utf_8_len = UTF8StringPointable.getUTFLength(serOrderedList, itemOffset); |
| for (int j = 0; j < utf_8_len; j++) { |
| out.writeByte(serOrderedList[2 + itemOffset + j]); |
| } |
| } |
| } catch (AsterixException ex) { |
| throw new AlgebricksException(ex); |
| } |
| } catch (IOException e1) { |
| throw new AlgebricksException(e1.getMessage()); |
| } |
| } |
| }; |
| } |
| }; |
| } |
| |
| @Override |
| public FunctionIdentifier getIdentifier() { |
| return FID; |
| } |
| } |