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/*
* Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// 06/10/2009 Andrei Ilitchev
// - JPA 2.0 - OrderedList support.
package org.eclipse.persistence.internal.helper;
/**
* Purpose: A helper class for sorting index/object pairs.
*
*
Responsibilities:
* Allows to sort a list of index/object pairs either directly
* or with Collections.sort(List) - using IndexedObject.compareTo;
* or with Collections.sort(List, Comparator) - using custom-defined Comparator.
*
* @see Collections
* @see Comparator
* @see OrderedListContainerPolicy
*/
public class IndexedObject implements Comparable {
private Integer index;
private Object object;
public IndexedObject(Integer index, Object object) {
this.index = index;
this.object = object;
}
public Integer getIndex() {
return index;
}
public void setIndex(Integer index) {
this.index = index;
}
public Object getObject() {
return object;
}
public void setObject(Object object) {
this.object = object;
}
/*
* Compares indexes, null is less than any non-null.
*/
public int compareTo(IndexedObject anotherIndexedObject) {
Integer anotherIndex = anotherIndexedObject.getIndex();
if(index == null) {
if(anotherIndex == null) {
return 0;
} else {
return -1;
}
} else {
if(anotherIndex == null) {
return 1;
} else {
return index.compareTo(anotherIndex);
}
}
}
public String toString() {
return "(" + index + ", " + object + ")";
}
}