org.primefaces.extensions.showcase.controller.timeline.LazyTimelineController.java Source code

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Here is the source code for org.primefaces.extensions.showcase.controller.timeline.LazyTimelineController.java

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/*
 * Copyright 2011-2015 PrimeFaces Extensions
 *
 * 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.
 *
 * $Id$
 */
package org.primefaces.extensions.showcase.controller.timeline;

import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;
import java.util.Random;

import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;

import org.apache.commons.lang3.RandomStringUtils;

import org.primefaces.component.timeline.TimelineUpdater;
import org.primefaces.event.timeline.TimelineLazyLoadEvent;
import org.primefaces.model.timeline.TimelineEvent;
import org.primefaces.model.timeline.TimelineModel;

/**
 * LazyTimelineController
 *
 * @author  Oleg Varaksin / last modified by $Author: $
 * @version $Revision: 1.0 $
 */
@ManagedBean
@ViewScoped
public class LazyTimelineController implements Serializable {

    private TimelineModel model;

    private float preloadFactor = 0;
    private long zoomMax;

    @PostConstruct
    protected void initialize() {
        // create empty model
        model = new TimelineModel();

        // about five months in milliseconds for zoomMax
        // this can help to avoid a long loading of events when zooming out to wide time ranges
        zoomMax = 1000L * 60 * 60 * 24 * 31 * 5;
    }

    public TimelineModel getModel() {
        return model;
    }

    public void onLazyLoad(TimelineLazyLoadEvent e) {
        try {
            // simulate time-consuming loading before adding new events
            Thread.sleep((long) (1000 * Math.random() + 100));
        } catch (Exception ex) {
            // ignore
        }

        TimelineUpdater timelineUpdater = TimelineUpdater.getCurrentInstance(":mainForm:timeline");

        Date startDate = e.getStartDateFirst(); // alias getStartDate() can be used too
        Date endDate = e.getEndDateFirst(); // alias getEndDate() can be used too

        // fetch events for the first time range
        generateRandomEvents(startDate, endDate, timelineUpdater);

        if (e.hasTwoRanges()) {
            // zooming out ==> fetch events for the second time range
            generateRandomEvents(e.getStartDateSecond(), e.getEndDateSecond(), timelineUpdater);
        }
    }

    private void generateRandomEvents(Date startDate, Date endDate, TimelineUpdater timelineUpdater) {
        Calendar cal = Calendar.getInstance();
        Date curDate = startDate;
        Random rnd = new Random();

        while (curDate.before(endDate)) {
            // create events in the given time range
            if (rnd.nextBoolean()) {
                // event with only one date
                model.add(new TimelineEvent("Event " + RandomStringUtils.randomNumeric(5), curDate),
                        timelineUpdater);
            } else {
                // event with start and end dates
                cal.setTimeInMillis(curDate.getTime());
                cal.add(Calendar.HOUR, 18);
                model.add(new TimelineEvent("Event " + RandomStringUtils.randomNumeric(5), curDate, cal.getTime()),
                        timelineUpdater);
            }

            cal.setTimeInMillis(curDate.getTime());
            cal.add(Calendar.HOUR, 24);

            curDate = cal.getTime();
        }
    }

    public void clearTimeline() {
        // clear Timeline, so that it can be loaded again with a new preload factor
        model.clear();
    }

    public void setPreloadFactor(float preloadFactor) {
        this.preloadFactor = preloadFactor;
    }

    public float getPreloadFactor() {
        return preloadFactor;
    }

    public long getZoomMax() {
        return zoomMax;
    }
}