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The Adobe Experience Manager SDK
/*************************************************************************
*
* ADOBE CONFIDENTIAL
* __________________
*
* Copyright 2013 Adobe Systems Incorporated
* All Rights Reserved.
*
* NOTICE: All information contained herein is, and remains
* the property of Adobe Systems Incorporated and its suppliers,
* if any. The intellectual and technical concepts contained
* herein are proprietary to Adobe Systems Incorporated and its
* suppliers and are protected by trade secret or copyright law.
* Dissemination of this information or reproduction of this material
* is strictly forbidden unless prior written permission is obtained
* from Adobe Systems Incorporated.
**************************************************************************/
package com.adobe.granite.maintenance;
import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;
import org.apache.sling.api.resource.Resource;
import org.quartz.CronExpression;
import com.adobe.granite.maintenance.impl.MaintenanceWindowImpl;
/**
* Utility class for maintenance related stuff.
*/
public abstract class MaintenanceUtil {
/**
* Check if the start and the end time are valid time definitions ([hour]:[minute]).
* This method does not check whether startTime is lower than endTime.
*/
public static boolean isValidTimeInterval(final String startTime, final String endTime) {
final int[] start = parseTime(startTime);
final int[] end = parseTime(endTime);
if ( start == null || end == null ) {
return false;
}
return true;
}
/**
* Check if the given time string is valid ([hour]:[minute])
* @return a two value array with hour and minute if its valid, null otherwise.
*/
public static int[] parseTime(final String value) throws IllegalArgumentException {
if ( value != null && value.trim().length() > 0 ) {
final int pos = value.indexOf(":");
if ( pos != -1 ) {
try {
final int hour = Integer.valueOf(value.substring(0, pos));
final int minute = Integer.valueOf(value.substring(pos + 1));
if ( hour >= 0 && hour <= 23 && minute >= 0 && minute <= 59 ) {
return new int[] {hour, minute};
}
} catch ( final NumberFormatException nfe ) {
// ignore
}
}
}
return null;
}
public static String getCronExpression(final int[] timeDef) {
if ( timeDef != null ) {
return "0 " + String.valueOf(timeDef[0]) + " " + String.valueOf(timeDef[1]) + " * * ?";
}
return null;
}
public static String getCronExpression(final String time) {
return getCronExpression(parseTime(time));
}
/**
* Return the next execution time for this window.
* If the current time is currently within the window, null will be returned.
* If the time definitions are invalid, null is returned as well.
* @param startTime
* @param endTime
* @return The next execution time, if the window is currently open
*/
public static Calendar getNextExecutionTime(final String startTime, final String endTime) {
final String startCron = getCronExpression(parseTime(startTime));
final String endCron = getCronExpression(parseTime(endTime));
if ( startCron == null || endCron == null ) {
return null;
}
try {
final Date now = new Date();
final CronExpression startExpr = new CronExpression(startCron);
final CronExpression endExpr = new CronExpression(endCron);
final Date nextStart = startExpr.getNextValidTimeAfter(now);
final Date nextEnd = endExpr.getNextValidTimeAfter(now);
if ( nextEnd.getTime() < nextStart.getTime() ) {
return null;
}
final Calendar nextExecution = Calendar.getInstance();
nextExecution.setTime(nextStart);
return nextExecution;
} catch ( final ParseException pe ) {
// Sanity check
return null;
}
}
/**
* Return the next execution time for this maintenance task
* If the time definitions are invalid, null is returned.
* @return The next execution time, if the window is valid
*/
public static Calendar getNextExecutionTime(final MaintenanceTaskInfo.TaskSchedule schedule,
final String startTime) {
final String startCron = getCronExpression(parseTime(startTime));
if ( startCron == null) {
return null;
}
try {
final Date now = new Date();
final CronExpression startExpr = new CronExpression(startCron);
final Date nextStart = startExpr.getNextValidTimeAfter(now);
final Calendar nextExecution = Calendar.getInstance();
nextExecution.setTime(nextStart);
switch ( schedule ) {
case WEEKLY : final int weekDay = nextExecution.get(Calendar.DAY_OF_WEEK);
if ( weekDay > 1 ) {
nextExecution.add(Calendar.DAY_OF_WEEK, 8 - weekDay);
}
break;
case BIWEEKLY : final int weekDay2 = nextExecution.get(Calendar.DAY_OF_WEEK);
if ( weekDay2 > 1 ) {
nextExecution.add(Calendar.DAY_OF_WEEK, 8 - weekDay2);
}
final int week = nextExecution.getActualMaximum(Calendar.WEEK_OF_YEAR);
if ( week % 2 == 0 ) {
nextExecution.add(Calendar.WEEK_OF_MONTH, 1);
}
break;
case MONTHLY : int dayOfMonth = nextExecution.get(Calendar.DAY_OF_MONTH);
while ( dayOfMonth != 1 ) {
nextExecution.add(Calendar.DAY_OF_MONTH, 1);
dayOfMonth = nextExecution.get(Calendar.DAY_OF_MONTH);
}
break;
default: // nothing to do
}
return nextExecution;
} catch ( final ParseException pe ) {
// Sanity check
return null;
}
}
/**
* Return the next execution time for this window.
* If the current time is currently within the window, null will be returned.
* If the time definitions are invalid, null is returned as well.
* @param windowResource The window resource.
* @return The next execution time, if the window is currently open
* @since 1.1
*/
public static Calendar getNextWindowExecutionTime(final Resource windowResource) {
try {
final Date now = new Date();
final MaintenanceWindowImpl window = new MaintenanceWindowImpl(windowResource);
final CronExpression startExpr = new CronExpression(window.getStartCronExpression());
final CronExpression endExpr = new CronExpression(window.getEndCronExpression());
final Date nextStart = startExpr.getNextValidTimeAfter(now);
final Date nextEnd = endExpr.getNextValidTimeAfter(nextStart);
if ( nextEnd.before(nextStart) ) {
return null;
}
final Calendar nextExecution = Calendar.getInstance();
nextExecution.setTime(nextStart);
return nextExecution;
} catch ( final ParseException pe ) {
// Sanity check
return null;
} catch ( final IllegalArgumentException iae ) {
return null;
}
}
}
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