org.springframework.xd.module.util.DateTrigger.java Source code

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Here is the source code for org.springframework.xd.module.util.DateTrigger.java

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/*
 * Copyright 2013 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 org.springframework.xd.module.util;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.TriggerContext;
import org.springframework.util.Assert;

/**
 * A {@link Trigger} implementation that enables execution on a series of Dates. By default it will fire one time as
 * soon as possible.
 * 
 * @author Glenn Renfro
 */
public class DateTrigger implements Trigger {

    private final List<Date> nextFireDates = new ArrayList<Date>();

    private final Log logger = LogFactory.getLog(getClass());

    public DateTrigger() {
        nextFireDates.add(new Date());
    }

    public DateTrigger(Date... dates) {
        for (Date date : dates) {
            Assert.notNull(date, "Date must not be null");
            this.nextFireDates.add(date);
        }
        Collections.sort(this.nextFireDates);
    }

    @Override
    public Date nextExecutionTime(TriggerContext triggerContext) {
        Date result = null;
        if (nextFireDates.size() > 0) {
            try {
                result = nextFireDates.remove(0);
            } catch (IndexOutOfBoundsException e) {
                logger.debug(e.getMessage());
            }
        }
        return result;
    }

}