Bug 267021 [DataBinding] NotUsedLocally errors in org.eclipse.core.databinding
bundles/org.eclipse.core.databinding.property/src/org/eclipse/core/databinding/property/set/DelegatingSetProperty.java
private final Object elementType;
	private final ISetProperty nullProperty = new NullSetProperty();
	protected DelegatingSetProperty() {
		this(null);
	}
	protected DelegatingSetProperty(Object elementType) {
		this.elementType = elementType;
	}
	/**
	 * Returns the property to delegate to for the specified source object.
	 * Repeated calls to this method with the same source object returns the
	 * same delegate instance.
	 * 
	 * @param source
	 *            the property source (may be null)