com.tkmtwo.timex.source.DurationDateTimeSource.java Source code

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Here is the source code for com.tkmtwo.timex.source.DurationDateTimeSource.java

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/*
 *
 * Copyright 2014 Tom Mahaffey
 *
 * 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.tkmtwo.timex.source;

import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;

import static com.google.common.base.Preconditions.checkNotNull;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.joda.time.DateTime;
import org.joda.time.Duration;

/**
 * A <code>DateTimeSource</code> which returns <code>Duration</code>-shifted
 * values.
 *
 *
 * @author Tom Mahaffey
 */
public class DurationDateTimeSource implements DateTimeSource, InitializingBean, FactoryBean, DisposableBean {

    protected final Logger logger = LoggerFactory.getLogger(getClass());
    private Duration duration;

    public Duration getDuration() {
        return duration;
    }

    public void setDuration(Duration d) {
        duration = checkNotNull(d, "Duration may not be null.");
    }

    public DateTime getDateTime() {
        return getDateTime(new DateTime());
    }

    public DateTime getDateTime(DateTime dt) {
        checkNotNull(dt, "Need a DateTime.");
        return dt.plus(getDuration());
    }

    //for InitializingBean
    public void afterPropertiesSet() {
        logger.info("Initializing.");
        checkNotNull(getDuration(), "Need a Duration.");
        logger.info("Initialized.");
    }

    @Override
    public Object getObject() {
        return this;
    }

    @Override
    public Class getObjectType() {
        return DurationDateTimeSource.class;
    }

    @Override
    public boolean isSingleton() {
        return true;
    }

    @Override
    public void destroy() {
        logger.info("Destroying.");
    }
}