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CronTimer impl done but more TC needed

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This commit is contained in:
Ziver Koc 2017-02-27 18:54:42 +01:00
parent d6e5bd2b65
commit a12ce134af
3 changed files with 200 additions and 12 deletions
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15
src/zutil/ArrayUtil.java
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@ -1,10 +1,25 @@
package zutil;
import java.util.List;
/**
* A utility class containing Array specific utility methods
*/
public class ArrayUtil {
/**
* Converts a List with Integer objects to a primary type int array
*/
public static int[] toIntArray(List<Integer> list){
if (list == null)
return null;
int[] arr = new int[list.size()];
int i = 0;
for (Integer v : list)
arr[i++] = v;
return arr;
}
/**
* Searches for a given object inside of an array.
* The method uses reference comparison or {@link #equals(Object)} to check for equality.

165
src/zutil/CronTimer.java
View file

@ -1,17 +1,23 @@
package zutil;
import com.mysql.fabric.xmlrpc.base.Array;
import sun.reflect.generics.reflectiveObjects.NotImplementedException;
import java.util.ArrayList;
import java.util.List;
import java.util.*;
/**
* This is a utility class that will generate timestamps from a Cron formatted String.
*
* @see <a hraf="http://www.nncron.ru/help/EN/working/cron-format.htm">Cron Format Specification</a>
*/
public class CronTimer {
public class CronTimer implements Iterator<Long>, Iterable<Long>{
private int[] minutes;
private int[] hours;
private int[] dayOfMonths;
private int[] months;
private int[] dayOfWeeks;
private int[] years;
/**
@ -38,11 +44,154 @@ public class CronTimer {
}
private void init(String minute, String hour, String dayOfMonth, String monthOfYear, String dayOfWeek, String year){
minutes = ArrayUtil.toIntArray(getRange(minute, 0, 59));
hours = ArrayUtil.toIntArray(getRange(hour, 0, 23));
dayOfMonths = ArrayUtil.toIntArray(getRange(dayOfMonth, 1, 31));
months = ArrayUtil.toIntArray(getRange(monthOfYear, 1, 12));
dayOfWeeks = ArrayUtil.toIntArray(getRange(dayOfWeek, 1, 7));
years = ArrayUtil.toIntArray(getRange(year,
1970,
Calendar.getInstance().get(Calendar.YEAR)+30));
}
protected static List<Integer> getRange(String number){
ArrayList<Integer> list = new ArrayList<>();
protected static List<Integer> getRange(String str, int from, int to){
if (str == null || str.isEmpty())
return Collections.emptyList();
List<Integer> list = new LinkedList<>();
String[] commaArr = str.split(",");
if (commaArr.length > 1){
for (String section : commaArr)
list.addAll(getRange(section, from, to));
}
else {
String[] divisionArr = str.split("/", 2);
if (divisionArr.length == 2) {
float divider = Integer.parseInt(divisionArr[1]);
Iterator<Integer> it = getRange(divisionArr[0], from, to).iterator();
while (it.hasNext()) {
Integer i = it.next();
if (i%divider == 0)
list.add(i);
}
}
else {
String[] rangeArr;
if (str.equals("*"))
rangeArr = new String[]{""+from, ""+to};
else
rangeArr = str.split("-", 2);
if (rangeArr.length == 2) {
int rangeFrom = Integer.parseInt(rangeArr[0]);
int rangeTo = Integer.parseInt(rangeArr[1]);
for (int i = rangeFrom; i <= rangeTo; ++i)
list.add(i);
} else {
list.add(Integer.parseInt(str));
}
}
}
return list;
}
@Override
public boolean hasNext() {
return true;
}
@Override
public Iterator<Long> iterator() {
return this;
}
@Override
public void remove() {
throw new NotImplementedException();
}
/**
* @return the next timestamp that triggers this cron timer from now,
* -1 if there is no more future trigger points.
*/
@Override
public Long next() {
return next(System.currentTimeMillis());
}
/**
* @param fromTimestamp the timestamp offset to check the trigger from. Should be in MS
* @return the next timestamp that triggers this cron timer from the given timestamp,
* -1 if there is no more future trigger points.
*/
public Long next(long fromTimestamp) {
Calendar cal = getCalendar(fromTimestamp);
int minute = cal.get(Calendar.MINUTE);
int index = Arrays.binarySearch(minutes, minute);
if (index < 0){ // not found in array
if (Math.abs(index) > minutes.length) {
cal.set(Calendar.MINUTE, minutes[0]);
cal.add(Calendar.HOUR_OF_DAY, 1);
} else
cal.set(Calendar.MINUTE, minutes[Math.abs(index+1)]);
}
int hour = cal.get(Calendar.HOUR_OF_DAY);
index = Arrays.binarySearch(hours, hour);
if (index < 0){ // not found in array
if (Math.abs(index) > hours.length) {
cal.set(Calendar.HOUR_OF_DAY, hours[0]);
cal.add(Calendar.DAY_OF_MONTH, 1);
} else
cal.set(Calendar.HOUR_OF_DAY, hours[Math.abs(index+1)]);
}
int day = cal.get(Calendar.DAY_OF_MONTH);
index = Arrays.binarySearch(dayOfMonths, day);
if (index < 0){ // index not found in array
// check if month have that many days in it
if (Math.abs(index) > dayOfMonths.length ||
dayOfMonths[Math.abs(index+1)] > cal.getActualMaximum(Calendar.DAY_OF_MONTH)) {
cal.set(Calendar.DAY_OF_MONTH, dayOfMonths[0]);
cal.add(Calendar.MONTH, 1);
} else
cal.set(Calendar.DAY_OF_MONTH, dayOfMonths[Math.abs(index+1)]);
}
int month = cal.get(Calendar.MONTH);
index = Arrays.binarySearch(months, month+1);
if (index < 0){ // index not found in array
if (Math.abs(index) > months.length) {
cal.set(Calendar.MONTH, months[0]-1);
cal.add(Calendar.YEAR, 1);
} else
cal.set(Calendar.MONTH, months[Math.abs(index+1)]-1);
}
/*
int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
index = Arrays.binarySearch(dayOfWeeks, dayOfWeek);
if (index < 0){ // index not found in array
if (Math.abs(index) > dayOfWeeks.length) {
cal.set(Calendar.DAY_OF_WEEK, dayOfWeeks[0]);
cal.add(Calendar.WEEK_OF_YEAR, 1);
} else
cal.set(Calendar.DAY_OF_WEEK, dayOfWeeks[Math.abs(index+1)]);
}
*/
int year = cal.get(Calendar.YEAR);
index = Arrays.binarySearch(years, year);
if (index < 0){ // index not found in array
if (Math.abs(index) > years.length)
return -1L;
else
cal.set(Calendar.YEAR, years[Math.abs(index+1)]);
}
return cal.getTimeInMillis();
}
protected Calendar getCalendar(long timestamp){
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(timestamp);
return cal;
}
}