com.nominanuda.lang.CronExpr.java Source code

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Here is the source code for com.nominanuda.lang.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();
    }
}