something like this:
usage:
SelectModel m = SelectModelUtils.toBeanSelectModel(someList, "name", "id"
);
explanation:
use the value of the property "name" as label, the value of the "id"
property as value;
assuming that the bean within the list contains this properties
(RuntimeException otherwise)
code:
public class SelectModelUtils
{
private static final BeanUtilsBean beanUtil = BeanUtilsBean.
getInstance();
/**
* Converts a list of beans to a {...@link SelectModel} using the values
of labelField and valueField.
*/
public static <E> SelectModel toBeanSelectModel(List<E> beanList,
String labelField, String valueField)
{
return new SimpleSelectModel(toBeanOptionModels(beanList,
labelField, valueField));
}
public static <E> SelectModel toBeanSelectModel(List<E> input,
String labelField)
{
return toBeanSelectModel(input, labelField, null);
}
/**
* Converts a list of beans to a list of {...@link OptionModel}s using
getters for label and value.
*/
private static <E> List<OptionModel> toBeanOptionModels(List<E>
beanList, String labelField, String valueField)
{
Defense.notNull(beanList, "beanList");
List<OptionModel> result = newList();
for (E bean : beanList)
result.add(toBeanOptionModel(bean, labelField, valueField));
return result;
}
/**
* Converts an bean to an {...@link OptionModel} using getters for label
and value.
*/
private static <E> OptionModel toBeanOptionModel(E bean, String
labelField, String valueField)
{
if(bean != null) try
{
String label = beanUtil.getProperty(bean,
labelField);
Object value = valueField == null ? bean :
beanUtil.getPropertyUtils().getProperty(bean, valueField);
return new SimpleOptionModel<Object>(value,
label);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
return new SimpleOptionModel<E>(bean);
}
}
Andy Pahne <andy.pa...@gmail.com>
28.01.2010 15:14
Bitte antworten an
"Tapestry users" <users@tapestry.apache.org>
An
users@tapestry.apache.org
Kopie
Thema
Easy Way to create a select model?
I feel a little dumb, because for years I have been using Tapestry.
Is there an _easy_ way og creating a SelectModel like this one (not so
uncommon one):
value label
---------------------
1 Jan
2 Feb
...
I had a look at the documentation. But I cannot believe I have to deal
with SelectModel, OptionModel, OptionGroupModel and whatelse for this
simple usecase.
I also had a look at the Wiki. I found four pages about selects. I
cannot believe that I have to use such bloat for my usecase.
I surely must be missing something, or not?
Andy
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