/*
 * Copyright cast(C) 2005, 2006 db4objects Inc. (http://www.db4o.com) 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:
 *     db4objects - Initial API and implementation
 *     Boris Bokowski (IBM Corporation) - bug 118429
 *     Tom Schindl<tom.schindl@bestsolution.at> - bugfix for 217940
 */
module org.eclipse.core.internal.databinding.validation.ReadOnlyValidator;

import java.lang.all;

import org.eclipse.core.databinding.validation.IValidator;
import org.eclipse.core.databinding.validation.ValidationStatus;
import org.eclipse.core.internal.databinding.BindingMessages;
import org.eclipse.core.runtime.IStatus;

/**
 * ReadOnlyValidator. A validator that can be used as a partial validator for read-only fields.
 */
public class ReadOnlyValidator : IValidator {

    private static ReadOnlyValidator singleton = null;

    /**
     * Returns the ReadOnlyValidator
     *
     * @return the ReadOnlyValidator
     */
    public static ReadOnlyValidator getDefault() {
        if (singleton is null) {
            singleton = new ReadOnlyValidator();
        }
        return singleton;
    }

    public IStatus validate(Object value) {
        // No changes are allowed
        return ValidationStatus.error(BindingMessages
                .getStringcast(BindingMessages.VALIDATE_NO_CHANGE_ALLOWED_HELP));
    }

}