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The interface ITypedColumnConverter declares A column converter class implementing the ITypedColumnConverter interface has to implement the following three methods that need to be implementedwill be displayed in the Conversion tab:

• convertFromObject()
  Converts from dataprovider value to db value

• convertToObject()
  Converts from db value to dataprovider value

• getToObjectType(one of TEXT, INTEGER, NUMBER, DATETIME or MEDIA)
  The dataprovider data type (so the resulting type of the convertToObject()).
  This type can be provided by using the IColumnTypes constants, being one of the IColumnTypes constants: TEXT, INTEGER, NUMBER, DATETIME or MEDIA

A column converter class can define properties in the getDefaultProperties() method, which will be displayed in the Conversion tab as well.

The column types that the column converter supports are to be specified in the getSupportedColumnTypes() method.

For an example of a column converter, see the NrToJodaConverter class in the example given on Providing UI Converters from Plugins page.

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An IColumnValidator can also define properties in the getDefaultProperties() method, whose values will be set by the developer in UI, in the Validation tab.

The column types that the validator supports are specified in the getSupportedColumnTypes() method.

All the implemented custom column validators must be returned by the getColumnValidators() method of the plugin class implementing the IColumnValidatorProvider interface, so that they become available within Servoy Developer.

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public class SizeValidator implements IColumnValidator
{
	private static final String
	LENGTH_PROPERTY = "length";

	public Map getDefaultProperties()
	{
		Map props = new HashMap();
		props.put(LENGTH_PROPERTY, "");
		return props;
	}

	public String getName()
   		{
        	return "servoy.SizeValidator";
    	}
    
	public int[] getSupportedColumnTypes()
    	{
        	return new int[] { IColumnTypes.TEXT, IColumnTypes.MEDIA };
    	}

	public void validate(Map props, Object arg) throws IllegalArgumentException
	{
		String propLength = (String)props.get(LENGTH_PROPERTY);
		int length = new Double(propLength.replace(',', '.')).intValue();
		if (arg instanceof byte[] && ((byte[])arg).length > length)
		{
			throw new IllegalArgumentException();
		}
		else if (arg instanceof String && ((String)arg).length() > length)
		{
			throw new IllegalArgumentException();
		}
	}
}