jodd-core/src/main/java/jodd/util/collection/CompositeEnumeration.java
public void add(final Enumeration<T> enumeration) {
		if (allEnumerations.contains(enumeration)) {
			throw new IllegalArgumentException("Duplicate enumeration");
		}
		allEnumerations.add(enumeration);
	}
public void add(final Enumeration<T> enumeration) {
		if (allEnumerations.contains(enumeration)) {
			throw new IllegalArgumentException("Duplicate enumeration");
		}
		allEnumerations.add(enumeration);
	}
Adds an enumeration to this composite.