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JSF2: limiting cc:attribute to a given object type within a List

Answer 1

A:

If you are the one producing these lists then the following could be a trivial solution:

interface StringList extends List<String> {}

class ArrayStringList extends ArrayList<String> implements StringList {}

Not too elegant though.

I think we have reached the boundaries of the Java language here. I have encountered the same problem, and couldn't find a better solution either...

Gabor Kulcsar 2010-07-31 07:04:37

Answer 2

+1 A:

You could check the type of each item using #{item.class.name}. The Class#getName() returns a String denoting the type. E.g. java.lang.String or java.lang.Long. You could make use of it in the rendered attribute.

Add an extra attribute denoting the full qualified classname.

<my:comp list="#{bean.list}" type="java.lang.String" />

in combination with

<cc:attribute name="list" type="java.util.List" required="true" />
<cc:attribute name="type" type="java.util.String" required="true" />

and this logic in cc:implementation:

<ul>
    <ui:repeat value="#{cc.attrs.list}" var="item">
        <h:panelGroup rendered="#{item.class.name == cc.attrs.type}">
            <li>#{item}</li>
        </h:panelGroup>
    </ui:repeat>
</ul>

BalusC 2010-08-12 17:54:28

This seems like a sensible way to do it. Thanks!

Zack 2010-08-13 14:27:34

You're welcome. I have by the way tested this in real before answering, just to be sure, and it works :)

BalusC 2010-08-13 14:30:03

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JSF2: limiting cc:attribute to a given object type within a List

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