Bug 127861 [DataBinding] Mark API provisional
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/ValueBinding.java
}
	/**
	 * @param convertedValue
	 * @return String
	 */
	private String doDomainValidation(Object convertedValue) {
		if (domainValidator == null) {
			return null;
		}
		String validationError = domainValidator.isValid(convertedValue);
		return errMsg(validationError);
	}
	private String doValidate(Object value) {
		String validationError = validator.isValid(value);
		return errMsg(validationError);
	}
	private String errMsg(String validationError) {
		context.updatePartialValidationError(targetChangeListener, null);
		context.updateValidationError(targetChangeListener, validationError);
		return validationError;
	}
	
	private boolean failure(String errorMessage) {
		if (errorMessage != null) {
			return true;
		}
		return false;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.internal.databinding.Binding#updateTargetFromModel()