net.intelie.pipes.cron.Cron Maven / Gradle / Ivy
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Intelie Pipes' API classes and interfaces
package net.intelie.pipes.cron;
import java.time.temporal.ChronoUnit;
import java.time.temporal.Temporal;
import java.util.*;
import java.util.stream.Collectors;
public class Cron implements Field {
private static final long serialVersionUID = 1L;
private static final int MAX_RETRIES = 100;
private final List fields;
private final List evalOrder;
public Cron(String expression) {
this(CronParsingHelper.parse(expression));
}
public Cron(Field seconds, Field minutes, Field hours, Field days, Field months, Field daysOfWeek) {
this(Arrays.asList(seconds, minutes, hours, days, months, daysOfWeek));
}
private Cron(List fields) {
this.fields = fields;
this.evalOrder = new ArrayList<>(fields);
Collections.reverse(evalOrder);
evalOrder.add(new ValueField(FieldType.NANOS, 0));
}
public > T next(T date) {
if (date == null) return null;
return nextOrSame(ChronoUnit.NANOS.addTo(date, 1));
}
@Override
public > T nextOrSame(T date) {
if (date == null) return null;
for (int i = 0; i < MAX_RETRIES; i++) {
T result = nextSingle(date);
if (result == null || result.equals(date))
return result;
date = result;
}
return null;
}
private > T nextSingle(T date) {
for (Field field : evalOrder)
date = field.nextOrSame(date);
return date;
}
public > T prev(T date) {
if (date == null) return null;
return prevOrSame(ChronoUnit.NANOS.addTo(date, -1));
}
@Override
public > T prevOrSame(T date) {
if (date == null) return null;
for (int i = 0; i < MAX_RETRIES; i++) {
T result = prevSingle(date);
if (result == null || result.equals(date))
return result;
date = result;
}
return null;
}
private > T prevSingle(T date) {
for (Field field : evalOrder)
date = field.prevOrSame(date);
return date;
}
@Override
public boolean matches(Temporal date) {
if (date == null) return false;
for (Field field : evalOrder)
if (!field.matches(date))
return false;
return true;
}
@Override
public String toString() {
return fields.stream().map(Object::toString).collect(Collectors.joining(" "));
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Cron that = (Cron) o;
return Objects.equals(this.fields, that.fields);
}
@Override
public int hashCode() {
return Objects.hashCode(fields);
}
}