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CronExpr.java
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/
CronExpr.java
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/*
* Copyright 2008-2011 the original author or authors.
*
* 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 com.nominanuda.lang;
import java.text.ParseException;
import java.util.Date;
import org.joda.time.DateTimeZone;
import com.nominanuda.code.Nullable;
public class CronExpr {
private final CronExpression quartzExpr;
/**
* timezone is defaulted to UTC
*/
public CronExpr(String cronExpression) throws IllegalArgumentException {
this(cronExpression, DateTimeZone.UTC);
}
/**
* @see org.joda.time.DateTimeZone#forID(String)
*/
public CronExpr(String cronExpression, String timeZone) throws IllegalArgumentException {
this(cronExpression, DateTimeZone.forID(timeZone));
}
private CronExpr(String cronExpression, DateTimeZone dtz) throws IllegalArgumentException {
try {
quartzExpr = new CronExpression(cronExpression);
quartzExpr.setTimeZone(dtz.toTimeZone());
} catch (ParseException e) {
throw new IllegalArgumentException(e.getMessage());
}
}
public @Nullable Long getTimeAfter(long afterTimeUtcEpochMills) {
Date res = quartzExpr.getTimeAfter(new Date(afterTimeUtcEpochMills));
return res == null ? null : res.getTime();
}
public @Nullable Long getTimeAfterNow() {
return getTimeAfter(System.currentTimeMillis());
}
public boolean hasTimeAfter(long afterTimeUtcEpochMills) {
return getTimeAfter(afterTimeUtcEpochMills) != null;
}
@Override
public String toString() {
return quartzExpr.getCronExpression();
}
}