Bug 118429 [DataBinding] Validation should use IStatus, not just Strings
In order to use data binding in Workbench or IDE dialogs and preference pages, we need validation in terms of IStatus objects. Using strings is too simplistic. For example, look at the wizard for creating a new class. You will get a warning if the class name does not start with an uppercase letter, or if you don't provide a package name, but you will still be able to click "Finish" to proceed anyway. (Note that IStatus is currently not on the classpath, we need to re-introduce the dependency on org.eclipse.equinox.common, which contains IStatus etc.)
bundles/org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/Diffs.java
}
	/**
	 * @param addedKeys
	 * @param removedKeys
	 * @param changedKeys
	 * @param oldValues
	 * @param newValues
	 * @return a map diff
	 */
	public static MapDiff createMapDiff(final Set addedKeys,
			final Set removedKeys, final Set changedKeys, final Map oldValues,
			final Map newValues) {
		return new MapDiff() {
			public Set getAddedKeys() {
				return addedKeys;
			}
			public Set getChangedKeys() {
				return changedKeys;
			}
			public Object getNewValue(Object key) {
				return newValues.get(key);
			}
			public Object getOldValue(Object key) {
				return oldValues.get(key);
			}
			public Set getRemovedKeys() {
				return removedKeys;
			}
		};
	}