/** Check if the given collection is a uniform collection of the given type. */
public static boolean isUniformCollection(Collection<?> c, Class<?> e) {
if (e == null) {
throw new IllegalArgumentException("Null reference type");
}
if (c == null) {
throw new IllegalArgumentException("Null collection");
}
if (c.isEmpty()) {
return false;
}
for (Object o : c) {
if (o == null || !e.isAssignableFrom(o.getClass())) {
return false;
}
}
return true;
}
/**
* Check if the given element denotes a supported array-friendly data structure, i.e. a data
* structure jconsole can render as an array.
*/
public static boolean canBeRenderedAsArray(Object elem) {
if (isSupportedArray(elem)) return true;
if (elem instanceof Collection) {
Collection<?> c = (Collection<?>) elem;
if (c.isEmpty()) {
// Empty collections of any Java type are not handled as arrays
//
return false;
} else {
// - Collections of CompositeData/TabularData are not handled
// as arrays
// - Collections of other Java types are handled as arrays
//
return !isUniformCollection(c, CompositeData.class)
&& !isUniformCollection(c, TabularData.class);
}
}
if (elem instanceof Map) {
return !(elem instanceof TabularData);
}
return false;
}