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POMany classes use an object, but having different views of it
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  1. POMany classes use an object, but having different views of it
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    copied!<p><br /> Sorry for the title, I couldn't think of a more self-descriptive one.</p> <p>In the stand-alone application I'm developing (it's a university assignment) I'm facing this problem:<br /> I've got my entities (or Model objects or Business object etc) which are nothing more than POJOs.</p> <p>Naturally there are (will be) many classes that uses them, but some of these classes should not be allowed to modify their value (e.g. using their setters); we can say that I need to pass an object to different classes with different permissions: read-only to some classes, read-write to others that are allowed to modify the state of the object.</p> <p>An example would be a GUI window that only displays information about the object: I would like to make sure that this class is totally unaware of how modify the state of the object.</p> <p>I read a lot of topics with some related problems (read-only interfaces, read-only implementation, defensive copies, etc...) but I did not find anything suitable for my case.</p> <p>Let's say I would like to <strong>grant access to the setter methods of an object only to specific classes</strong>, but I can't find a way to achieve this.</p> <p>I initially thought that interfaces would be fine (eg <code>ReadOnlyObject</code> with getters and <code>WriteOnlyObject</code> with setters and <code>Object</code> implementing both of them) but the problem is that <code>WriteOnlyObject</code> interface would be easily reachable by any class that uses <code>ReadOnlyObject</code>. Beside that, I'm not convinced that writing interfaces with only getters or setters is a good practice.</p> <p>Please help! @_@</p>
 

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