Bug 147530 [DataBinding] Provide event objects for change listeners
Before data binding goes 1.0 it would be wise to provide EventObjects for the following listeners to ensure that the API doesn't preclude future expansion of the values supplied to listeners. Interfaces that would be affected: * IValueChangeListener * IValueChangingListener * IListChangeListener * ISetChangeListener * IMappingChangeListener
bundles/org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/ValueBinding.java
private boolean updatingModel = false;
	private WritableValue partialValidationErrorObservable;
	private WritableValue validationErrorObservable;
	private IValidator domainValidator;
	/**
	 * @param context
	 * @param target
	 * @param model
	 * @param bindSpec
	 */
	public ValueBinding(DataBindingContext context, IObservableValue target,
			IObservableValue model, BindSpec bindSpec) {
		super(context);
		this.target = target;
		this.model = model;
		fillBindSpecDefaults(bindSpec, target, model);
		validationErrorObservable = new WritableValue(context
				.getValidationRealm(), IStatus.class, null);
		partialValidationErrorObservable = new WritableValue(context
				.getValidationRealm(), IStatus.class, null);
		if (bindSpec.isUpdateTarget()) {
			modelToTargetConverter = bindSpec.getModelToTargetConverter();
			if (modelToTargetConverter == null) {
				throw new BindingException(
						"Missing model to target converter from " + model.getValueType() + " to " + target.getValueType()); 
			}
			model.addValueChangeListener(modelChangeListener);
		}
		if (bindSpec.isUpdateModel()) {
			targetToModelConverter = bindSpec.getTargetToModelConverter();