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convertFromObject()
Convert from UI value to dataprovider value
convertToObject()
Converts from dataprovider value to UI value
getToObjectType (one of TEXT, INTEGER, NUMBER, DATETIME or MEDIAgetToObjectType()
The UI 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 UI converter class can also define properties in the getDefaultProperties() method, which will be displayed in the Edit text format property dialog as well.

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This is an example of a plugin that delivers a converter from joda time (which has support for time persiods) to java-util-date (which is supported by Servoy UI elements) time.

Code Block

language	java

private static final IUIConverter[] UI_CONVERTERS = new IUIConverter[] { JodaToDateConverter.INSTANCE };
 
public IUIConverter[] getUIConverters()
{
    return UI_CONVERTERS;
}
 
static class NrToJodaConverter implements ITypedColumnConverter
{
    static final NrToJodaConverter INSTANCE = new NrToJodaConverter();
 
    public Object convertToObject(Map<String, String> props, int column_type, Object dbvalue) throws Exception
    {
        if (dbvalue == null)
        {
            return null;
        }
        return new DateTime(Utils.getAsLong(dbvalue));
    }
 
    public Object convertFromObject(Map<String, String> props, int column_type, Object obj) throws Exception
    {
        if (obj instanceof DateTime)
        {
            return Long.valueOf(((DateTime)obj).getMillis());
        }
        return obj; // or throw an exception
    }
 
    public Map<String, String> getDefaultProperties()
    {
        return null;
    }
 
    public int[] getSupportedColumnTypes()
    {
        return new int[] { IColumnTypes.INTEGER };
    }
 
    public String getName()
    {
        return getClass().getSimpleName();
    }
 
    public int getToObjectType(Map<String, String> props)
    {
        // Servoy does not understand joda time natively.
        return IColumnTypes.MEDIA;
    }
}
 
static class JodaToDateConverter implements IUIConverter
{
    static final JodaToDateConverter INSTANCE = new JodaToDateConverter();
 
    public Object convertFromObject(Map<String, String> props, int input_type, Object converted) throws Exception
    {
        if (converted instanceof Date)
        {
            return new DateTime(((Date)converted).getTime());
        }
        return converted; // or return null or throw an exception
    }
 
    public Object convertToObject(Map<String, String> props, int input_type, Object input) throws Exception
    {
        if (input instanceof DateTime)
        {
            return new Date(((DateTime)input).getMillis());
        }
        return input; // or return null or throw an exception
    }
 
    public Map<String, String> getDefaultProperties()
    {
        return null;
    }
 
    public int[] getSupportedDataproviderTypes()
    {
        // Servoy does not understand joda time natively, therefore the dataprovider type will be MEDIA.
        return new int[] { IColumnTypes.MEDIA };
    }
 
    public String getName()
    {
        return getClass().getSimpleName();
    }
 
    public int getToObjectType(Map<String, String> props)
    {
        return IColumnTypes.DATETIME;
    }
}

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