# CronExpressionConstraint.java

    /*
     * Copyright (c) 2010-2012, Paul Merlin.
     * Copyright (c) 2012, Niclas Hedhman.
     *
     * Licensed  under the  Apache License,  Version 2.0  (the "License");
     * you may not use  this file  except in  compliance with the License.
     * You may obtain a copy of the License at
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed  under the  License is distributed on an "AS IS" BASIS,
     * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
     * implied.
     *
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    package org.qi4j.library.scheduler.schedule.cron;

    import org.codeartisans.sked.cron.CronSchedule;
    import org.qi4j.api.constraint.Constraint;

    public class CronExpressionConstraint
        implements Constraint<CronExpression, String>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean isValid( CronExpression annotation, String cronExpression )
        {
            return CronSchedule.isExpressionValid( cronExpression );
        }
    }