Bind JavaScript Equality Operator to Java Function

Question

I am using the JavaScript Engine in Java to evaluate some strings. I want user.group == group1 in JavaScript to evaluate the Java method user.hasGroup(group1). User contains a list of group strings.

I know I can bind functions with the following, but I am not sure how to replace the equality operator and use the right side as a parameter. (jsEngine is my JavaScript engine)

Bindings b = jsEngine.createBindings();
b.put(String name, Object value);   
Engine.setBindings(Bindings bindings, int scope);

wow, a question which is legitimately about [java] and [javascript] ;) — Peter Lawrey
– Peter Lawrey, Commented Feb 4, 2015 at 16:41
I don't believe this is possible. I think the best you could do, in some cases, would be something along these lines: stackoverflow.com/a/4700278/636009 but there's nothing you could translate user.group and group1 to that would show them as equivalent under string comparison, is there? — David Conrad
– David Conrad, Commented Feb 4, 2015 at 20:14

Aninda Bhattacharyya · Accepted Answer · 2015-02-04 16:56:41Z

0

You can use jsEngine.eval("if(user.group == group1)"), catch the Boolean object and decide further.

answered Feb 4, 2015 at 16:56

Aninda Bhattacharyya

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3 Comments

spooky655 Over a year ago

Can you elaborate? Are you suggesting that I evaluate the boolean before I define what user.group is?

Aninda Bhattacharyya Over a year ago

No, you create the binding with the user data first. I am only saying based on jsEngine.eval("if(user.group == group1)") , you take some actions in java or javascript, based on your implementation.

spooky655 Over a year ago

I think what I want is not possible, so I opted to use user.hasGroup(group1) explicitly.

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