org.graylog2.migrations.Migration Maven / Gradle / Ivy
/**
* This file is part of Graylog.
*
* Graylog is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Graylog is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Graylog. If not, see .
*/
package org.graylog2.migrations;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Comparator;
import java.util.Objects;
public abstract class Migration implements Comparable {
private static final Comparator COMPARATOR = Comparator.comparingLong(migration -> migration.createdAt().toEpochSecond());
public abstract ZonedDateTime createdAt();
public abstract void upgrade();
@Override
public int compareTo(Migration that) {
return COMPARATOR.compare(this, that);
}
@Override
public int hashCode() {
return Objects.hash(COMPARATOR);
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final Migration that = (Migration) o;
return Objects.equals(this.createdAt(), that.createdAt());
}
@Override
public String toString() {
return this.getClass().getSimpleName() + '{' + createdAt().format(DateTimeFormatter.ISO_DATE_TIME) + '}';
}
}