java - Change at runtime to a marker interface -

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today saw next code:

public tab addtab(component c, string caption, resource icon, int position) {     tab addedtab = super.addtab(c, i18ncaption, icon, position);     // if not securized     if (!(addedtab instanceof securizedcomponent)) {         addedtab = securitywrapper.createsecuritywrapper((tabsheettabimpl)addedtab, caption);     }     return addedtab; }

securizedcomponent marker interface

/**  *   * marker interface. securized components changed @ runtime implement interface.  * way, possible know if component has been securized asking component instanceof securizedcomponent  *   * allows framework not securize components more once  *   */    public interface securizedcomponent {     }

the method createsecuritywrapper like:

    enhancer enhancer = new enhancer();     enhancer.setsuperclass(wrapperclass);     enhancer.setclassloader(source.getclass().getclassloader());     enhancer.setinterfaces(new class[]{securizedcomponent.class});      //more stuff...

i know code doing, when tab added first time, changed @ runtime implement securizedcomponent interface. question is: practice? there better way implement it?

this doesn't shock me, really. put check if (!(addedtab instanceof securizedcomponent)) { inside securitywrapper, won't have check everywhere in code, , calling securitywrapper securized object nothing.

otherwise, use securizable interface issecured() method, implementations return false until securitywrapper works magic.

of course "security" secure code, since support change class implement securized , bypass checks...


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