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.common.exceptions.ErrorCode;
  import org.apache.asterix.common.exceptions.RuntimeDataException;
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.AInt32;
  import org.apache.asterix.om.base.AMutableInt32;
  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.hierachy.ATypeHierarchy;
  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 TreatAsIntegerDescriptor extends AbstractScalarFunctionDynamicDescriptor {
      private static final long serialVersionUID = 1L;
      public static final IFunctionDescriptorFactory FACTORY = TreatAsIntegerDescriptor::new;
  
      @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 {
  
                  final IScalarEvaluator inputEval = args[0].createScalarEvaluator(ctx);
                  final IPointable inputArg = new VoidPointable();
                  final ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
                  final DataOutput out = resultStorage.getDataOutput();
                  final AMutableInt32 aInt32 = new AMutableInt32(0);
  
                  @SuppressWarnings("unchecked")
                  final ISerializerDeserializer<AInt32> int32Ser =
                          SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.AINT32);
  
                  return new IScalarEvaluator() {
                      @Override
                      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                          inputEval.evaluate(tuple, inputArg);
  
                          if (PointableHelper.checkAndSetMissingOrNull(result, inputArg)) {
                              return;
                          }
  
                          int intValue;
                          byte[] bytes = inputArg.getByteArray();
                          int startOffset = inputArg.getStartOffset();
                          ATypeTag tt = ATypeTag.VALUE_TYPE_MAPPING[bytes[startOffset]];
                          switch (tt) {
                              case TINYINT:
                              case SMALLINT:
                              case INTEGER:
                              case BIGINT:
                                  intValue = ATypeHierarchy.getIntegerValue(getIdentifier().getName(), 0, bytes,
                                          startOffset, true);
                                  break;
                              case FLOAT:
                              case DOUBLE:
                                  double doubleValue =
                                          ATypeHierarchy.getDoubleValue(getIdentifier().getName(), 0, bytes, startOffset);
                                  intValue = asInt(doubleValue);
                                  break;
                              default:
                                  throw new TypeMismatchException(sourceLoc, bytes[startOffset],
                                          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);
                          }
  
                          resultStorage.reset();
                          aInt32.setValue(intValue);
                          int32Ser.serialize(aInt32, out);
                          result.set(resultStorage);
                      }
  
                      private int asInt(double d) throws HyracksDataException {
                          if (Double.isFinite(d)) {
                              long v = (long) d;
                              if (v == d && Integer.MIN_VALUE <= v && v <= Integer.MAX_VALUE) {
                                  return (int) v;
                              }
                          }
                          throw new RuntimeDataException(ErrorCode.INTEGER_VALUE_EXPECTED, sourceLoc, d);
                      }
                  };
              }
          };
  
      }
  
      @Override
      public FunctionIdentifier getIdentifier() {
          return BuiltinFunctions.TREAT_AS_INTEGER;
      }
  }
  