asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericUnaryMinusDescriptor.java

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.dataflow.data.nontagged.serde.ADoubleSerializerDeserializer;
import edu.uci.ics.asterix.dataflow.data.nontagged.serde.AFloatSerializerDeserializer;
import edu.uci.ics.asterix.dataflow.data.nontagged.serde.AInt16SerializerDeserializer;
import edu.uci.ics.asterix.dataflow.data.nontagged.serde.AInt32SerializerDeserializer;
import edu.uci.ics.asterix.dataflow.data.nontagged.serde.AInt64SerializerDeserializer;
import edu.uci.ics.asterix.dataflow.data.nontagged.serde.AInt8SerializerDeserializer;
import edu.uci.ics.asterix.formats.nontagged.AqlSerializerDeserializerProvider;
import edu.uci.ics.asterix.om.base.AMutableDouble;
import edu.uci.ics.asterix.om.base.AMutableFloat;
import edu.uci.ics.asterix.om.base.AMutableInt16;
import edu.uci.ics.asterix.om.base.AMutableInt32;
import edu.uci.ics.asterix.om.base.AMutableInt64;
import edu.uci.ics.asterix.om.base.AMutableInt8;
import edu.uci.ics.asterix.om.base.ANull;
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.common.exceptions.NotImplementedException;
import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluator;
import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
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 NumericUnaryMinusDescriptor extends AbstractScalarFunctionDynamicDescriptor {

    private static final long serialVersionUID = 1L;
    private final static FunctionIdentifier FID = new FunctionIdentifier(FunctionConstants.ASTERIX_NS,
            "numeric-unary-minus", 1, true);

    @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 {

                return new IEvaluator() {

                    private DataOutput out = output.getDataOutput();
                    private ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
                    private IEvaluator eval = args[0].createEvaluator(argOut);
                    private byte serNullTypeTag = ATypeTag.NULL.serialize();
                    private byte serInt8TypeTag = ATypeTag.INT8.serialize();
                    private byte serInt16TypeTag = ATypeTag.INT16.serialize();
                    private byte serInt32TypeTag = ATypeTag.INT32.serialize();
                    private byte serInt64TypeTag = ATypeTag.INT64.serialize();
                    private byte serFloatTypeTag = ATypeTag.FLOAT.serialize();
                    private byte serDoubleTypeTag = ATypeTag.DOUBLE.serialize();
                    private AMutableDouble aDouble = new AMutableDouble(0);
                    private AMutableFloat aFloat = new AMutableFloat(0);
                    private AMutableInt64 aInt64 = new AMutableInt64(0);
                    private AMutableInt32 aInt32 = new AMutableInt32(0);
                    private AMutableInt16 aInt16 = new AMutableInt16((short) 0);
                    private AMutableInt8 aInt8 = new AMutableInt8((byte) 0);
                    @SuppressWarnings("unchecked")
                    private ISerializerDeserializer serde;

                    @SuppressWarnings("unchecked")
                    @Override
                    public void evaluate(IFrameTupleReference tuple) throws AlgebricksException {
                        argOut.reset();
                        eval.evaluate(tuple);
                        try {
                            if (argOut.getBytes()[0] == serNullTypeTag) {
                                serde = AqlSerializerDeserializerProvider.INSTANCE
                                        .getSerializerDeserializer(BuiltinType.ANULL);
                                serde.serialize(ANull.NULL, out);
                                return;
                            } else if (argOut.getBytes()[0] == serInt8TypeTag) {
                                serde = AqlSerializerDeserializerProvider.INSTANCE
                                        .getSerializerDeserializer(BuiltinType.AINT8);
                                aInt8.setValue((byte) -AInt8SerializerDeserializer.getByte(argOut.getBytes(), 1));
                                serde.serialize(aInt8, out);
                            } else if (argOut.getBytes()[0] == serInt16TypeTag) {
                                serde = AqlSerializerDeserializerProvider.INSTANCE
                                        .getSerializerDeserializer(BuiltinType.AINT16);
                                aInt16.setValue((short) -AInt16SerializerDeserializer.getShort(argOut.getBytes(), 1));
                                serde.serialize(aInt16, out);
                            } else if (argOut.getBytes()[0] == serInt32TypeTag) {
                                serde = AqlSerializerDeserializerProvider.INSTANCE
                                        .getSerializerDeserializer(BuiltinType.AINT32);
                                aInt32.setValue(-AInt32SerializerDeserializer.getInt(argOut.getBytes(), 1));
                                serde.serialize(aInt32, out);
                            } else if (argOut.getBytes()[0] == serInt64TypeTag) {
                                serde = AqlSerializerDeserializerProvider.INSTANCE
                                        .getSerializerDeserializer(BuiltinType.AINT64);
                                aInt64.setValue(-AInt64SerializerDeserializer.getLong(argOut.getBytes(), 1));
                                serde.serialize(aInt64, out);
                            } else if (argOut.getBytes()[0] == serFloatTypeTag) {
                                serde = AqlSerializerDeserializerProvider.INSTANCE
                                        .getSerializerDeserializer(BuiltinType.AFLOAT);
                                aFloat.setValue(-AFloatSerializerDeserializer.getFloat(argOut.getBytes(), 1));
                                serde.serialize(aFloat, out);
                            } else if (argOut.getBytes()[0] == serDoubleTypeTag) {
                                serde = AqlSerializerDeserializerProvider.INSTANCE
                                        .getSerializerDeserializer(BuiltinType.ADOUBLE);
                                aDouble.setValue(-ADoubleSerializerDeserializer.getDouble(argOut.getBytes(), 1));
                                serde.serialize(aDouble, out);
                            } else {
                                throw new NotImplementedException("Unary minus is not implemented for "
                                        + EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(argOut.getBytes()[0]));
                            }
                        } catch (HyracksDataException e) {
                            throw new AlgebricksException(e);
                        }
                    }
                };
            }
        };
    }

    @Override
    public FunctionIdentifier getIdentifier() {
        return FID;
    }

}