java - Why UIComponentBase class doesn't expose a setAttribute() method? -



java - Why UIComponentBase class doesn't expose a setAttribute() method? -

uicomponentbase have public abstract map<string, object> getattributes() method doesn't have setattributes() method .why designed ? assuming designers wanted create map unmodifiable why ?

my requirement clean attributes of component . how instead of calling each of setters ? can not phone call clear() on attributes map because it throws unsupportedoperationexception

because it's not "just" hashmap or so. it's customized map next specific features mentioned in the javadoc:

the returned implementation must back upwards of standard , optional map methods, plus back upwards next additional requirements:

the map implementation must implement java.io.serializable interface. any effort add together null key or value must throw nullpointerexception. any effort add together key not string must throw classcastexception. if attribute name specified key matches property of uicomponent's implementation class, next methods have special behavior: containskey - homecoming false. get() - if property readable, phone call getter method , homecoming returned value (wrapping primitive values in corresponding wrapper classes); otherwise throw illegalargumentexception. put() - if property writeable, phone call setter method set corresponding value (unwrapping primitive values in corresponding wrapper classes). if property not writeable, or effort made set property of primitive type null, throw illegalargumentexception. remove - throw illegalargumentexception.

particularly get() special. doesn't "just" homecoming value associated map key, invokes getter method on current component, e.g. component.getfoo() when component.getattributes().get("foo") requested. getter methods in turn delegate statehelper.

the setattributes() allow overriding , breaking contract , perchance cause whole jsf component tree working fail.

java jsf

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