// Copyright 2011 The Apache Software Foundation
//
// 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.apache.tapestry5.ioc.services.cron;
import org.apache.tapestry5.ioc.internal.services.cron.CronExpression;
import java.text.ParseException;
import java.util.Date;
public class CronSchedule implements Schedule
{
private CronExpression cron;
public CronSchedule(String cronExpression)
{
try
{
this.cron = new CronExpression(cronExpression);
} catch (ParseException e)
{
throw new RuntimeException(e);
}
}
@Override
public long firstExecution()
{
return getNextValidTimeAfterNow();
}
@Override
public long nextExecution(long previousExecution)
{
return getNextValidTimeAfterNow();
}
private long getNextValidTimeAfterNow()
{
final Date time = cron.getNextValidTimeAfter(new Date());
return time == null ? 0 : time.getTime();
}
}