RequiredValidator.java

/**
 * Copyright (c) 2014-2017 by the respective copyright holders.
 * 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
 */
package org.eclipse.smarthome.config.core.validation.internal;

import org.eclipse.smarthome.config.core.ConfigDescriptionParameter;
import org.eclipse.smarthome.config.core.validation.ConfigValidationMessage;

/**
 * The {@link ConfigDescriptionParameterValidator} for the required attribute of a {@link ConfigDescriptionParameter}.
 *
 * @author Thomas Höfer - Initial contribution
 */
final class RequiredValidator implements ConfigDescriptionParameterValidator {

    /*
     * (non-Javadoc)
     *
     * @see
     * org.eclipse.smarthome.config.core.validation.internal.ConfigDescriptionParameterValidator#validate(org.eclipse.
     * smarthome.config.core.ConfigDescriptionParameter, java.lang.Object)
     */
    @Override
    public ConfigValidationMessage validate(ConfigDescriptionParameter param, Object value) {
        if (param.isRequired() && value == null) {
            MessageKey messageKey = MessageKey.PARAMETER_REQUIRED;
            return new ConfigValidationMessage(param.getName(), messageKey.defaultMessage, messageKey.key);
        }

        return null;
    }

}