evaluting s:hasPermission once only in a page

[ptalekar]

i have a page with quite a few :

<ice:inputText id="enterpriseName"
value="#{enterpriseTreeManager.enterprise.name}" size="50"
required="true"
disabled="${!s:hasPermission('enterprise', 'edit', null}">

i am using the RuleBasedIdentity, so I also have a security.drl file with all the premissions. my problem is that the Identity.hasPermission() method get called for each s:hasPermission. is there a way to store the result of s:hasPermission in a page scoped variable and then use that instead of s:hasPermission?

i tried the following but it still calls Identity.hasPermission multiple times:
<c:set var="editPermission" scope="page" value="${s:hasPermission('enterprise', 'edit', null)}"/>
and then
<ice:inputText id="enterpriseName"
value="#{enterpriseTreeManager.enterprise.name}" size="50"
required="true"
disabled="${!editPermission}">


thanks in advance

[gavin.king]

I guess this is generally useful:

@Name("cachedValue")
@Install(false)
public class CachedValue {

 private ValueBinding value; //Use ValueExpression in Seam 1.3
 private Object cachedValue;

 public void setValue(ValueBinding value) { this.value = value; }

 public ValueBinding getValue() { return value; }

 @Unwrap public Object get() {
 if (cachedValue==null) {
 cachedValue = getValue().getValue();
 }
 return cachedValue;
 }

}

Declare a cached value like this:

<component name="hasPermission" class="CachedValue" scope="session">
 <property name="value">#{s:hasPermission('enterprise', 'edit', null)}</property>
</component>

(You can similarly declare any other cached values, and their scopes.)

And use it like #{hasPermission}.

[gavin.king]

Note that the class ValueBinding is a org.jboss.seam.core.Expressions.ValueBinding, not the JSF class.

[gavin.king]

Of course, it would be easy to simplify the config to:

<n:cachedValue scope="session" value="#{s:hasPermission('enterprise', 'edit', null)}"/>

just by using @Namespace.