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.carbondata.index.bloom;
  
  import java.math.BigDecimal;
  
  import org.apache.carbondata.core.constants.CarbonCommonConstants;
  import org.apache.carbondata.core.metadata.datatype.DataType;
  import org.apache.carbondata.core.metadata.datatype.DataTypes;
  
  public class DataConvertUtil {
    /**
     * get raw bytes from LV structure, L is short encoded
     */
    public static byte[] getRawBytes(byte[] lvData) {
      byte[] indexValue = new byte[lvData.length - CarbonCommonConstants.SHORT_SIZE_IN_BYTE];
      System.arraycopy(lvData, CarbonCommonConstants.SHORT_SIZE_IN_BYTE,
          indexValue, 0, lvData.length - CarbonCommonConstants.SHORT_SIZE_IN_BYTE);
      return indexValue;
    }
  
    /**
     * get raw bytes from LV structure, L is int encoded
     */
    public static byte[] getRawBytesForVarchar(byte[] lvData) {
      byte[] indexValue = new byte[lvData.length - CarbonCommonConstants.INT_SIZE_IN_BYTE];
      System.arraycopy(lvData, CarbonCommonConstants.INT_SIZE_IN_BYTE,
          indexValue, 0, lvData.length - CarbonCommonConstants.INT_SIZE_IN_BYTE);
      return indexValue;
    }
  
    /**
     * return default null value based on datatype. This method refers to ColumnPage.putNull
     *
     * Note: since we can not mark NULL with corresponding data type in bloom index
     * we set/get a `NullValue` for NULL, such that pruning using bloom filter
     * will have false positive case if filter value is the `NullValue`.
     * This should not affect the correctness of result
     */
    public static Object getNullValueForMeasure(DataType dataType, int scale) {
      if (dataType == DataTypes.BOOLEAN) {
        return false;
      } else if (dataType == DataTypes.BYTE) {
        return (byte) 0;
      } else if (dataType == DataTypes.SHORT) {
        return (short) 0;
      } else if (dataType == DataTypes.INT) {
        return 0;
      } else if (dataType == DataTypes.LONG || dataType == DataTypes.TIMESTAMP) {
        return 0L;
      } else if (dataType == DataTypes.DOUBLE) {
        return 0.0;
      } else if (DataTypes.isDecimal(dataType)) {
        // keep consistence with `DecimalConverter.getDecimal` in loading process
        return BigDecimal.valueOf(0, scale);
      } else {
        throw new IllegalArgumentException("unsupported data type: " + dataType);
      }
    }
  }
  