samples/jsadapter-fallthrough.js

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// Demonstrate how to provide a default fall-through solution for adapted Java
// objects, forwarding all calls that are not adapted.

var Date = Java.type('java.time.LocalDate')

function wrapDate(d) {
    return new JSAdapter() {
        __call__: function() {
            // adapted (extra) methods
            if (arguments[0] === 'yesterday') {
                return d.minusDays(1)
            }
            // fall-through: forward all other, non-adapted method calls
            var args = [d].concat(Array.prototype.slice.call(arguments, 1)) 
            return Function.call.apply(d[arguments[0]], args)
        }
    }
}

var now = wrapDate(Date.now())

print(now)
print(now.yesterday()) // adapted
print(now.lengthOfMonth()) // fall through to original method
print(now.atTime(23, 42)) // arguments are passed through