/*******************************************************************************
* Copyright (c) 2000, 2015 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.viewers;
/**
* An interface for validating a cell editor's input.
* <p>
* This interface should be implemented by classes that wish to
* act as cell editor validators.
* </p>
*/
public interface ICellEditorValidator {
/**
* Returns a string indicating whether the given value is valid;
* <code>null</code> means valid, and non-<code>null</code> means
* invalid, with the result being the error message to display
* to the end user.
* <p>
* It is the responsibility of the implementor to fully format the
* message before returning it.
* </p>
*
* @param value the value to be validated
* @return the error message, or <code>null</code> indicating
* that the value is valid
*/
public String isValid(Object value);
}