Class Util

java.lang.Object
org.supercsv.util.Util
public final class Util extends Object
Useful utility methods.

  • Constructor Details

    • Util

      private Util()

  • Method Details

    • executeCellProcessors

      public static void executeCellProcessors(List<Object> destination, List<?> source, CellProcessor[] processors, int lineNo, int rowNo)
      Processes each element in the source List (using the corresponding processor chain in the processors array) and adds it to the destination List. A null CellProcessor in the array indicates that no processing is required and the element should be added as-is.
      Parameters:
      destination - the List to add the processed elements to (which is cleared before it's populated)
      source - the List of source elements to be processed
      processors - the array of CellProcessors used to process each element. The number of elements in this array must match the size of the source List. A null CellProcessor in this array indicates that no processing is required and the element should be added as-is.
      lineNo - the current line number
      rowNo - the current row number
      Throws:
      NullPointerException - if destination, source or processors is null
      SuperCsvConstraintViolationException - if a CellProcessor constraint failed
      SuperCsvException - if source.size() != processors.length, or CellProcessor execution failed

    • filterListToMap

      public static <T> void filterListToMap(Map<String,T> destinationMap, String[] nameMapping, List<? extends T> sourceList)
      Converts a List to a Map using the elements of the nameMapping array as the keys of the Map.
      Type Parameters:
      T - the type of the values in the map
      Parameters:
      destinationMap - the destination Map (which is cleared before it's populated)
      nameMapping - the keys of the Map (corresponding with the elements in the sourceList). Cannot contain duplicates.
      sourceList - the List to convert
      Throws:
      NullPointerException - if destinationMap, nameMapping or sourceList are null
      SuperCsvException - if nameMapping and sourceList are not the same size

    • filterMapToList

      public static List<Object> filterMapToList(Map<String,?> map, String[] nameMapping)
      Returns a List of all of the values in the Map whose key matches an entry in the nameMapping array.
      Parameters:
      map - the map
      nameMapping - the keys of the Map values to add to the List
      Returns:
      a List of all of the values in the Map whose key matches an entry in the nameMapping array
      Throws:
      NullPointerException - if map or nameMapping is null

    • filterMapToObjectArray

      public static Object[] filterMapToObjectArray(Map<String,?> values, String[] nameMapping)
      Converts a Map to an array of objects, adding only those entries whose key is in the nameMapping array.
      Parameters:
      values - the Map of values to convert
      nameMapping - the keys to extract from the Map (elements in the target array will be added in this order)
      Returns:
      the array of Objects
      Throws:
      NullPointerException - if values or nameMapping is null

    • objectArrayToStringArray

      public static String[] objectArrayToStringArray(Object[] objectArray)
      Converts an Object array to a String array (null-safe), by calling toString() on each element.
      Parameters:
      objectArray - the Object array
      Returns:
      the String array, or null if objectArray is null

    • objectListToStringArray

      public static String[] objectListToStringArray(List<?> objectList)
      Converts an List<Object> to a String array (null-safe), by calling toString() on each element.
      Parameters:
      objectList - the List
      Returns:
      the String array, or null if objectList is null