If you look at the example in the bug, you can see this isn't working.
Its not about changing the property or binding it, but about passing a
parameter to the component which is passed further to the bean.
How come this functions for the *first* component instance, while the
beans in the other instances get the same value?
It not in a loop - I instanciate the component three times...
PS. no, it has not been confirmed as a bug yet-
ציטוט Kent Tong:
Ron Piterman <rpiterman <at> gmx.net> writes:
Please look at the example in bug
http://issues.apache.org/jira/browse/TAPESTRY-406
It shows that if you use 3 components of the same type, each one has a
bean, whose attribute is set to a parameter of the component, the
*first* component's parameter will apply to all 3 beans. Thats very
strange, as if the three instances share the same bean without updating
its properties.
Has this been confirmed as a bug?
What <set> does is to evaluate a certain OGNL expression, get the
value and set it to a property of a bean. There is no binding at
all. Even if that OGNL expression evaluates to another value later,
it will not affect that bean.
In Tapestry 3, here is relevant code:
public class BeanProvider {
private Object instantiateBean(String beanName, IBeanSpecification spec)
{
String className = spec.getClassName();
Object bean = null;
Class beanClass = _resolver.findClass(className);
bean = beanClass.newInstance();
List initializers = spec.getInitializers();
if (initializers == null)
return bean;
Iterator i = initializers.iterator();
while (i.hasNext())
IBeanInitializer iz = (IBeanInitializer) i.next();
iz.setBeanProperty(this, bean);
}
return bean;
}
}
public class ExpressionBeanInitializer extends AbstractBeanInitializer
{
protected String _expression;
public void setBeanProperty(IBeanProvider provider, Object bean)
{
IResourceResolver resolver = provider.getResourceResolver();
IComponent component = provider.getComponent();
Object value = OgnlUtils.get(_expression, resolver, component);
setBeanProperty(resolver, bean, value);
}
}
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