Class ColumnConverter

java.lang.Object
uk.ac.starlink.topcat.ColumnConverter
Direct Known Subclasses:
AngleColumnConverter
public abstract class ColumnConverter extends Object
Performs unit conversions on data values based on a given ValueInfo.
Since:
17 Sep 2004
Author:
Mark Taylor (Starlink)

  • Constructor Details

    • ColumnConverter

      public ColumnConverter()

  • Method Details

    • convertValue

      public abstract Object convertValue(Object value)
      Converts a value from its raw value to the value required for a particular purpose.
      Parameters:
      value - raw value
      Returns:
      converted value

    • convertExpression

      public abstract String convertExpression(String inExpr)
      Returns a JEL expression for the converted value of a supplied unconverted input expression.
      Parameters:
      inExpr - input unconverted expression, assumed JEL-friendly
      Returns:
      JEL expression for converted value

    • toString

      public abstract String toString()
      Provides a user-understandable description of what this converter does. Must be enough to distinguish it from distinct converters which might do the same sort of thing.
      Overrides:
      toString in class Object

    • getConverters

      public static ColumnConverter[] getConverters(uk.ac.starlink.table.ValueInfo info)
      Returns a set of converters appropriate for a given ValueInfo. If only one converter is returned, it's a unit converter (equivalent to a no-op).
      Parameters:
      info - object describing the data which is required
      Returns:
      a set of alternative converters which could be used to modify the values in a given column