Primefaces dynamic table property

Question

How can i reach the subClass property of a variable. As you can see Primefaces example I can reach properties like Car.color, Car.shape but what I want to get is "Car.PriceInformations.Price". I tried car[column.property][column.subproperty] but it didnt worked. Must I use subtable or is there any better solution?

<p:dataTable id="cars" var="car" value="#{tableBean.carsSmall}" filteredValue="#{tableBean.filteredCars}">                      
    <p:columns value="#{tableBean.columns}" var="column" columnIndexVar="colIndex"   
                sortBy="#{car[column.property]}" filterBy="#{car[column.property]}">  
        <f:facet name="header">  
            #{column.header}  
        </f:facet>  

        #{car[column.property]}  
    </p:columns>  

</p:dataTable>

is Car.PriceInformations a collection? and do you want to access one of the item in the collection? — erencan
Try to access the same property in java class does it accessible as your editor might shows errors/suggestion for this expression — Jitesh
@Jitesh It is accessible. There is no problem with access. When I try "car["priceInformations"]["price"]", it shows priceInformation's toString method in cell. — Turgut Dsfadfa
I guess this is what you looking for, stackoverflow.com/questions/10722255/… — Mukul Goel

erencan erencan · Accepted Answer · 2013-05-22T13:59:33

You can modify this BalusC answer according to your needs.

Basically you can extend SpringBeanFacesELResolver as you use it for EL resolver. However, EL resolver is looking for Spring Bean inside Spring Context. Source code give very good understanding what SpringBenFacesELResolver do.

Secondly you need javax.el.BeanELResolver to access managed bean values as descriped in BalusC answer. I use Java Reflections for this purpose. javax.el.BeanELResolver can be loaded inside SpringBeanFacesELResolver dynamicly at run tim then invoke SpringBeanFacesELResolver#getValue for nested properties just like in the referenced answer.

Here is the code:

public class ExtendedSpringELResolver extends SpringBeanFacesELResolver {

@Override
public Object getValue(ELContext context, Object base, Object property)
{
    if (property == null || base == null || base instanceof ResourceBundle || base instanceof Map || base instanceof Collection) {
        return null;
    }

    String propertyString = property.toString();

    if (propertyString.contains(".")) {
        Object value = base;
        Class []params=  new Class[]{ELContext.class,Object.class,Object.class};
        for (String propertyPart : propertyString.split("\\.")) {

            Class aClass = BeanELResolver.class;

            try {
                Method getValueMethod = aClass.getDeclaredMethod("getValue",params );
                value = getValueMethod.invoke(aClass.newInstance(), context, value, propertyPart);
            } catch (IllegalArgumentException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (InstantiationException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (SecurityException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (NoSuchMethodException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }

        return value;
    }
    else {
        return super.getValue(context, base, property);
    }

}

}

P.S. I tried the code with the example in PrimeFaces showcase. I change String color to Color color where Color is a user defined class for my case which has only a String proporty. I access the values by adding color.color to columns list.

private String columnTemplate = "model manufacturer year color.color";

Primefaces dynamic table property

2 Answers