/*************************GO-LICENSE-START*********************************
* Copyright 2014 ThoughtWorks, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*************************GO-LICENSE-END***********************************/
package com.thoughtworks.go.domain;
import java.util.Comparator;
import java.io.Serializable;
public abstract class PersistentObject implements Serializable {
public static final long NOT_PERSISTED = -1;
protected long id = NOT_PERSISTED;
public static final Comparator ORDER_DESCENDING_ID = new Comparator() {
public int compare(Object o1, Object o2) {
PersistentObject po1 = (PersistentObject) o1;
PersistentObject po2 = (PersistentObject) o2;
long comparison = po2.getId() - po1.getId();
if (comparison==0) return 0;
return comparison > 0? 1: -1;
}
};
public long getId() {
return id;
}
public final void setId(long id) {
this.id = id;
}
public final boolean hasId() {
return id != -1;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
PersistentObject that = (PersistentObject) o;
if (id != that.id) {
return false;
}
return true;
}
@Override
public int hashCode() {
return (int) (id ^ (id >>> 32));
}
}