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.om.types.hierachy;
  
  import java.io.DataOutput;
  import java.io.IOException;
  
  import org.apache.asterix.common.exceptions.ErrorCode;
  import org.apache.asterix.common.exceptions.RuntimeDataException;
  import org.apache.asterix.om.base.AInt32;
  import org.apache.asterix.om.base.IAObject;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.hierachy.ATypeHierarchy.TypeCastingMathFunctionType;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.primitive.DoublePointable;
  
  public class DoubleToInt32TypeConvertComputer implements ITypeConvertComputer {
  
      private static final DoubleToInt32TypeConvertComputer INSTANCE_STRICT = new DoubleToInt32TypeConvertComputer(true);
  
      private static final DoubleToInt32TypeConvertComputer INSTANCE_LAX = new DoubleToInt32TypeConvertComputer(false);
  
      private final boolean strict;
  
      private DoubleToInt32TypeConvertComputer(boolean strict) {
          this.strict = strict;
      }
  
      public static DoubleToInt32TypeConvertComputer getInstance(boolean strict) {
          return strict ? INSTANCE_STRICT : INSTANCE_LAX;
      }
  
      @Override
      public void convertType(byte[] data, int start, int length, DataOutput out) throws IOException {
          int targetValue = convertType(data, start);
          out.writeByte(ATypeTag.INTEGER.serialize());
          out.writeInt(targetValue);
      }
  
      int convertType(byte[] data, int start) throws HyracksDataException {
          double sourceValue = DoublePointable.getDouble(data, start);
          return convert(sourceValue);
      }
  
      @Override
      public IAObject convertType(IAObject sourceObject, TypeCastingMathFunctionType mathFunction)
              throws HyracksDataException {
          double sourceValue = ATypeHierarchy.applyMathFunctionToDoubleValue(sourceObject, mathFunction);
          int targetValue = convert(sourceValue);
          return new AInt32(targetValue);
      }
  
      public int convert(double sourceValue) throws HyracksDataException {
          // Boundary check
          if (Double.isNaN(sourceValue)) {
              if (strict) {
                  raiseBoundaryCheckException(sourceValue);
              } else {
                  return 0;
              }
          } else if (sourceValue > Integer.MAX_VALUE) {
              if (strict) {
                  return raiseBoundaryCheckException(sourceValue);
              } else {
                  return Integer.MAX_VALUE;
              }
          } else if (sourceValue < Integer.MIN_VALUE) {
              if (strict) {
                  return raiseBoundaryCheckException(sourceValue);
              } else {
                  return Integer.MIN_VALUE;
              }
          }
  
          return (int) sourceValue;
      }
  
      private int raiseBoundaryCheckException(double sourceValue) throws HyracksDataException {
          throw new RuntimeDataException(ErrorCode.TYPE_CONVERT_OUT_OF_BOUND, sourceValue, ATypeTag.INTEGER,
                  Integer.MAX_VALUE, Integer.MIN_VALUE);
      }
  }
  