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Graylog

There is a newer version: 5.2.7

/**
 * This file is part of Graylog.
 *
 * Graylog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Graylog.  If not, see .
 */
package org.graylog2.database.validators;

import org.graylog2.plugin.database.validators.ValidationResult;
import org.graylog2.plugin.database.validators.Validator;

import java.util.List;

public class ListValidator implements Validator {
    private boolean allowMissing;

    public ListValidator() {
        this(false);
    }

    public ListValidator(boolean allowNull) {
        this.allowMissing = allowNull;
    }

    @Override
    public ValidationResult validate(Object value) {
        if ((allowMissing && value == null) || value instanceof List) {
            return new ValidationResult.ValidationPassed();
        } else {
            return new ValidationResult.ValidationFailed("Value is not a list!");
        }
    }
}