com.sun.enterprise.deployment.OrderedSet Maven / Gradle / Ivy
The newest version!
/*
* Copyright (c) 2022, 2023 Contributors to the Eclipse Foundation
* Copyright (c) 1997, 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.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.enterprise.deployment;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Set;
/**
* Ordered collection (by the order of additions) that does not allow duplicates.
*
* @param type of all items.
*
* @author Danny Coward
*/
public class OrderedSet extends ArrayList implements Set {
private static final long serialVersionUID = 1L;
/**
* Construct an empty collection.
*/
public OrderedSet() {
}
/**
* Construct an ordered set from the given collection.
*/
public OrderedSet(Collection collection) {
this.addAll(collection);
}
/**
* Add the given object to the Set if it is not equal (equals()) to
* an element already in the set.
*/
@Override
public boolean add(T o) {
if (o != null && !this.contains(o)) {
return super.add(o);
}
return false;
}
/**
* Add all the elements in the given set that are not already
* in this ordered set.
*/
@Override
public boolean addAll(Collection collection) {
if (collection == null) {
return false;
}
boolean changed = false;
for (T o : collection) {
if (add(o)) {
changed = true;
}
}
return changed;
}
}