Examples of org.apache.wicket.util.convert.IConverter

org.apache.wicket.util.convert.IConverter
Converts input to output and vice versa. Converters are needed in web applications because we have to switch between Java objects on the server and Strings in the browser output and input.
Output conversion, which is handled by {@link #convertToString(Object,Locale)}, is typically used by components when they render, so that a date can be displayed as '12/12/2007'. Input conversion, handled by {@link #convertToObject(String,Locale)}, is typically used by form components to interpret incoming values Such values are strings as they are send as request parameters from browsers. An incoming value could be the string '12/12/2007' which could be translated to a corresponding {@link Date} object.Notice that incoming value, when used by a FormComponent, will never be null because before validation form components perform the required (see {@link FormComponent#isRequired()} checkwhich errors out on null values. In the case the FormComponent is not required and the user enters a null value converters will not be invoked because no type conversion is necessary.
@author Eelco Hillenius @author Jonathan Locke @param < C> The object to convert from and to String @see org.apache.wicket.Component#getConverter(Class) @see org.apache.wicket.Application#getConverterLocator()

    if (modelObject != null)
    {
      // Get converter
      final Class<?> objectClass = modelObject.getClass();


      final IConverter converter = getConverter(objectClass);


      // Model string from property
      final String modelString = converter.convertToString(modelObject, getLocale());


      if (modelString != null)
      {
        // If we should escape the markup
        if (getFlag(FLAG_ESCAPE_MODEL_STRINGS))

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        reportValidationError(e, error);
      }
    }
    else
    {
      final IConverter converter = getConverter(getType());


      try
      {
        convertedInput = (T)converter.convertToObject(getInput(), getLocale());
      }
      catch (ConversionException e)
      {
        ValidationError error = new ValidationError();
        if (e.getResourceKey() != null)

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      // Get label for choice
      String label = "";


      if (objectClass != null && objectClass != String.class)
      {
        final IConverter converter = getConverter(objectClass);
        label = converter.convertToString(displayValue, getLocale());
      }
      else if (displayValue != null)
      {
        label = displayValue.toString();
      }

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      private static final long serialVersionUID = 1L;


      @Override
      public IConverter getConverter(Class<?> type)
      {
        IConverter c = AjaxEditableLabel.this.getConverter(type);
        return c != null ? c : super.getConverter(type);
      }


      @Override
      protected void onModelChanged()

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      private static final long serialVersionUID = 1L;


      @Override
      public IConverter getConverter(Class<?> type)
      {
        IConverter c = AjaxEditableLabel.this.getConverter(type);
        return c != null ? c : super.getConverter(type);
      }


      @Override
      protected void onComponentTagBody(MarkupStream markupStream, ComponentTag openTag)

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      Class<?> objectClass = displayValue == null ? null : displayValue.getClass();
      // Get label for choice
      String label = "";
      if (objectClass != null && objectClass != String.class)
      {
        IConverter converter = getConverter(objectClass);
        label = converter.convertToString(displayValue, getLocale());
      }
      else if (displayValue != null)
      {
        label = displayValue.toString();
      }

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      // don't provide a format
    }


    if (format == null)
    {
      IConverter converter = component.getConverter(DateTime.class);
      if (!(converter instanceof DateConverter))
      {
        converter = component.getConverter(Date.class);
      }
      format = ((SimpleDateFormat)((DateConverter)converter).getDateFormat(component

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        reportValidationError(e, error);
      }
    }
    else
    {
      final IConverter converter = getConverter(getType());
      try
      {
        convertedInput = converter.convertToObject(getInput(), getLocale());
      }
      catch (ConversionException e)
      {
        ValidationError error = new ValidationError();
        if (e.getResourceKey() != null)

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  public final String getModelObjectAsString(final Object modelObject)
  {
    if (modelObject != null)
    {
      // Get converter
      final IConverter converter = getConverter(modelObject.getClass());


      // Model string from property
      final String modelString = converter.convertToString(modelObject, getLocale());


      if (modelString != null)
      {
        // If we should escape the markup
        if (getFlag(FLAG_ESCAPE_MODEL_STRINGS))

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    // Convert the parameter if necessary, depending on the setter's
    // attribute
    final Class<?> paramClass = parameterClasses[0];
    try
    {
      final IConverter converter = Application.get()
        .getConverterLocator()
        .getConverter(paramClass);
      final Object param = converter.convertToObject(value, locale);
      if (param == null)
      {
        throw new MarkupException("Unable to convert value '" + value + "' into " +
          paramClass + ". May be there is no converter for that type registered?");
      }

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