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()

  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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    {
      private static final long serialVersionUID = 1L;


      public IConverter getConverter(Class type)
      {
        IConverter c = AjaxEditableChoiceLabel.this.getConverter(type);
        return c != null ? c : super.getConverter(type);
      }


      protected void onComponentTagBody(MarkupStream markupStream, ComponentTag openTag)
      {
        String displayValue = getModelObjectAsString();
        if (renderer != null)
        {
          Object displayObject = renderer.getDisplayValue(getModelObject());
          Class objectClass = (displayObject == null ? null : displayObject.getClass());


          if (objectClass != null && objectClass != String.class)
          {
            final IConverter converter = getConverter(objectClass);


            displayValue = converter.convertToString(displayObject, getLocale());
          }
        }


        if (Strings.isEmpty(displayValue))
        {

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    {
      private static final long serialVersionUID = 1L;


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


      protected void onModelChanged()
      {

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    {
      private static final long serialVersionUID = 1L;


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


      protected void onComponentTagBody(MarkupStream markupStream, ComponentTag openTag)
      {

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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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public class ConverterTest extends GeoServerWicketTestSupport {


    public void testConvertEmtpyString() {
        // Wicket forms rely on converters returning null from an empty string conversion
        IConverterLocator locator = tester.getApplication().getConverterLocator();
        IConverter convert = locator.getConverter(Integer.class);
        assertNotNull(convert);
        assertNull(convert.convertToObject("", Locale.getDefault()));
    }

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    // the converter both ways
    ColorPickerField textField = new ColorPickerField("paramValue",
        paramVale, Color.class) {
      @Override
      public IConverter getConverter(Class type) {
        return new IConverter() {


          public String convertToString(Object value, Locale locale) {
            String input = (String) value;
            if (input.startsWith("#"))
              return input.substring(1);

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            // for String vars, e.g. {label}
            return (String)value;
          }
          else
          {
            IConverter converter = getConverter(value.getClass());
            if (converter == null)
            {
              return Strings.toString(value);
            }
            else
            {
              return converter.convertToString(value, getLocale());
            }
          }
        }
      }.toString();
    }

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


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

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  {
    Object value = PropertyResolver.getValue(variableName, model);


    if (value != null)
    {
      final IConverter converter = getConverter(value.getClass());
      if (converter != null)
      {
        return converter.convertToString(value, Session.get().getLocale());
      }
      else
      {
        return value.toString();
      }

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