NotValidator.java

/*******************************************************************************
 * Copyright (c) 2010 Philipp Kursawe.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *   Philipp Kursawe (phil.kursawe@gmail.com) - initial API and implementation
 ******************************************************************************/
package eclipseutils.jface.databinding.validators;

import org.eclipse.core.databinding.validation.IValidator;
import org.eclipse.core.runtime.IStatus;

/**
 * Negates a validator.
 * 
 * @author <a href="mailto:phil.kursawe@gmail.com">Philipp Kursawe</a>
 * 
 */
public class NotValidator extends AbstractValidator {

	private final IValidator validator;
	private final String message;

	/**
	 * @param severity
	 * @param validator
	 *            to negate
	 * @param message
	 */
	public NotValidator(final int severity, final IValidator validator,
			final String message) {
		super(severity);
		this.validator = validator;
		this.message = message;
	}

	@Override
	protected String performValidation(final Object value) throws Throwable {
		final IStatus status = safeValidate(validator, value, getSeverity());
		if (status.isOK()) {
			return message;
		}
		return null;
	}
}