jsf - Retrieve converter attribute expression from UIViewParameter -


i need create dependent converter view-param jsf has no built in solution for.

in example bar dependent on foo.

<f:viewparam name="foo" value="#{bean.foo}" converter="#{appscopebean.fooconverter}"/> <f:viewparam name="bar" value="#{bean.bar}" converter="#{bean.barconverter}"/>

in @postconstruct converted value bean.foo not yet available, manually retrieve request parameter bar , converter performing el lookup.

@postconstruct public void init() {     // mimic uiviewparameter behavior      // grab request parameter manually     final string fooid = context.getexternalcontext().getrequestparametermap().get("foo");      // grab converter manually     final converter fooconverter = context.getapplication().evaluateexpressionget(context,         "#{appscopebean.fooconverter}", converter.class);      final foo foo = fooconverter.getasobject(context, null, fooid);      // create bar converter dependent on foo }

now tried obtain converter resolving uiviewparameter, converter instance null since not yet set jsf lifecycle (why? if converter scope broader should safe). want obtain el-expression lookup converter (to reduce need hardcode above dry):

@postconstruct public void init() {     // mimic uiviewparameter behavior      final uiviewparameter fooviewparam = facescontextutils.getviewparam(context, "foo");      // final converter fooconverter = fooviewparam.getconverter(); null      // pseudo code     final converter fooconverter = context.getapplication().evaluateexpressionget(context,         fooviewparam.getconverterexpression(), converter.class);      final foo foo = fooconverter.getasobject(context, null, fooid);      // create bar converter dependent on foo }

jsf should handle support dependent converters iterative life-cycle bean event invoked after each uiviewparameter converter instantiation.


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