content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.asterix.runtime.evaluators.functions;
  
  import java.io.DataOutput;
  
  import org.apache.asterix.common.annotations.MissingNullInOutFunction;
  import org.apache.asterix.dataflow.data.nontagged.serde.ADoubleSerializerDeserializer;
  import org.apache.asterix.dataflow.data.nontagged.serde.AFloatSerializerDeserializer;
  import org.apache.asterix.dataflow.data.nontagged.serde.AInt16SerializerDeserializer;
  import org.apache.asterix.dataflow.data.nontagged.serde.AInt32SerializerDeserializer;
  import org.apache.asterix.dataflow.data.nontagged.serde.AInt64SerializerDeserializer;
  import org.apache.asterix.dataflow.data.nontagged.serde.AInt8SerializerDeserializer;
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.AMutableDouble;
  import org.apache.asterix.om.base.AMutableFloat;
  import org.apache.asterix.om.base.AMutableInt16;
  import org.apache.asterix.om.base.AMutableInt32;
  import org.apache.asterix.om.base.AMutableInt64;
  import org.apache.asterix.om.base.AMutableInt8;
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.functions.IFunctionDescriptorFactory;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.asterix.om.types.EnumDeserializer;
  import org.apache.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
  import org.apache.asterix.runtime.exceptions.TypeMismatchException;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
  import org.apache.hyracks.api.context.IEvaluatorContext;
  import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IPointable;
  import org.apache.hyracks.data.std.primitive.VoidPointable;
  import org.apache.hyracks.data.std.util.ArrayBackedValueStorage;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  
  @MissingNullInOutFunction
  public class NumericSubtractDescriptor extends AbstractScalarFunctionDynamicDescriptor {
  
      private static final long serialVersionUID = 1L;
      public static final IFunctionDescriptorFactory FACTORY = NumericSubtractDescriptor::new;
  
      @Override
      public FunctionIdentifier getIdentifier() {
          return BuiltinFunctions.NUMERIC_SUBTRACT;
      }
  
      @Override
      public IScalarEvaluatorFactory createEvaluatorFactory(final IScalarEvaluatorFactory[] args) {
          return new IScalarEvaluatorFactory() {
              private static final long serialVersionUID = 1L;
  
              @Override
              public IScalarEvaluator createScalarEvaluator(final IEvaluatorContext ctx) throws HyracksDataException {
  
                  return new IScalarEvaluator() {
                      private ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
                      private DataOutput out = resultStorage.getDataOutput();
                      // one temp. buffer re-used by both children
                      private IPointable argPtr = new VoidPointable();
                      private IScalarEvaluator evalLeft = args[0].createScalarEvaluator(ctx);
                      private IScalarEvaluator evalRight = args[1].createScalarEvaluator(ctx);
                      private double[] operands = new double[args.length];
                      private boolean metInt8 = false, metInt16 = false, metInt32 = false, metInt64 = false,
                              metFloat = false, metDouble = false;
                      private ATypeTag typeTag;
                      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("rawtypes")
                      private ISerializerDeserializer serde;
  
                      @SuppressWarnings("unchecked")
                      @Override
                      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                          resultStorage.reset();
                          for (int i = 0; i < args.length; i++) {
                              if (i == 0) {
                                  evalLeft.evaluate(tuple, argPtr);
                              } else {
                                  evalRight.evaluate(tuple, argPtr);
                              }
                              byte[] data = argPtr.getByteArray();
                              int offset = argPtr.getStartOffset();
                              typeTag = EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(data[offset]);
                              switch (typeTag) {
                                  case TINYINT:
                                      metInt8 = true;
                                      operands[i] = AInt8SerializerDeserializer.getByte(data, offset + 1);
                                      break;
                                  case SMALLINT:
                                      metInt16 = true;
                                      operands[i] = AInt16SerializerDeserializer.getShort(data, offset + 1);
                                      break;
                                  case INTEGER:
                                      metInt32 = true;
                                      operands[i] = AInt32SerializerDeserializer.getInt(data, offset + 1);
                                      break;
                                  case BIGINT:
                                      metInt64 = true;
                                      operands[i] = AInt64SerializerDeserializer.getLong(data, offset + 1);
                                      break;
                                  case FLOAT:
                                      metFloat = true;
                                      operands[i] = AFloatSerializerDeserializer.getFloat(data, offset + 1);
                                      break;
                                  case DOUBLE:
                                      metDouble = true;
                                      operands[i] = ADoubleSerializerDeserializer.getDouble(data, offset + 1);
                                      break;
                                  default:
                                      throw new TypeMismatchException(sourceLoc, getIdentifier(), i, data[offset],
                                              ATypeTag.SERIALIZED_INT8_TYPE_TAG, ATypeTag.SERIALIZED_INT16_TYPE_TAG,
                                              ATypeTag.SERIALIZED_INT32_TYPE_TAG, ATypeTag.SERIALIZED_INT64_TYPE_TAG,
                                              ATypeTag.SERIALIZED_FLOAT_TYPE_TAG, ATypeTag.SERIALIZED_DOUBLE_TYPE_TAG);
                              }
                          }
  
                          if (metDouble) {
                              serde = SerializerDeserializerProvider.INSTANCE
                                      .getSerializerDeserializer(BuiltinType.ADOUBLE);
                              aDouble.setValue(operands[0] - operands[1]);
                              serde.serialize(aDouble, out);
                          } else if (metFloat) {
                              serde = SerializerDeserializerProvider.INSTANCE
                                      .getSerializerDeserializer(BuiltinType.AFLOAT);
                              aFloat.setValue((float) (operands[0] - operands[1]));
                              serde.serialize(aFloat, out);
                          } else if (metInt64) {
                              serde = SerializerDeserializerProvider.INSTANCE
                                      .getSerializerDeserializer(BuiltinType.AINT64);
                              aInt64.setValue((long) (operands[0] - operands[1]));
                              serde.serialize(aInt64, out);
                          } else if (metInt32) {
                              serde = SerializerDeserializerProvider.INSTANCE
                                      .getSerializerDeserializer(BuiltinType.AINT32);
                              aInt32.setValue((int) (operands[0] - operands[1]));
                              serde.serialize(aInt32, out);
                          } else if (metInt16) {
                              serde = SerializerDeserializerProvider.INSTANCE
                                      .getSerializerDeserializer(BuiltinType.AINT16);
                              aInt16.setValue((short) (operands[0] - operands[1]));
                              serde.serialize(aInt16, out);
                          } else if (metInt8) {
                              serde = SerializerDeserializerProvider.INSTANCE
                                      .getSerializerDeserializer(BuiltinType.AINT8);
                              aInt8.setValue((byte) (operands[0] - operands[1]));
                              serde.serialize(aInt8, out);
                          }
                          result.set(resultStorage);
                      }
                  };
              }
          };
      }
  
  }
  