I wonder if anyone has an approach to avoids (or lessen) the tedious
instanceof if loops in the following kind of code:
public static void javaMethod(Object value) {
if (value instanceof String) {
jsniMethod((String) value);
} else if (value instanceof Number) {
jsniMethod(((Number) value).doubleValue());
} else if (value instanceof Boolean) {
jsniMethod((Boolean) value);
} else {
if (value!=null)
throw new RuntimeException("not a primitive : " +
value.getClass().getName());
}
}
...
public static native void jsniMethod(String arg) /*-{
jsMethod(arg);
}-*/;
public static native void jsniMethod(double arg) /*-{
jsMethod(arg);
}-*/;
public static native void jsniMethod(boolean arg) /*-{
jsMethod(arg);
}-*/;
and in JavaScript - a single method
jsMethod = function(data) {
alert('hello ' + data);
};
Part of the annoyance is tedium, but I often wonder if I might miss a case.
What I'd love is for a class JavaScriptPrimitive or something like that.
JSONValue is pretty close in semantics, but I don't think it works for
this use case.
so, then I could write a single
public static native void jsniMethod(JavaScriptPrimitive arg) /*-{
jsMethod(arg);
}-*/;
and perhaps have a single utility cast method toJavaScriptPrimitive
public static void javaMethod(Object value) {
jsniMethod(toJavaScriptPrimitive(value));
}
I've written code like this so often now, I'm resigned to continuing along
those lines - but I am posting here because I wonder if there is a better
way?
Thanks,
Tom
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