package jease.cms.service;
import jease.cms.domain.Sequence;
import jfix.db4o.Database;
/**
* Service to ease the handling of (named) sequences.
*/
public class Sequences {
/**
* Returns next value for sequence given by name.
*/
public static int getNext(String name) {
Sequence sequence = Sequences.query(name);
if (sequence == null) {
sequence = new Sequence(name);
}
int next = sequence.getNext();
Database.save(sequence);
return next;
}
/**
* Returns current value for sequence given by name.
*/
public static int getValue(String name) {
Sequence sequence = Sequences.query(name);
if (sequence == null) {
return 0;
} else {
return sequence.getValue();
}
}
private static Sequence query(String name) {
if (name != null) {
for (Sequence sequence : Database.query(Sequence.class)) {
if (name.equals(sequence.getName())) {
return sequence;
}
}
}
return null;
}
}