athenz.shade.zts.org.jvnet.hk2.internal.IndexedListData Maven / Gradle / Ivy
/*
* Copyright (c) 2012, 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 athenz.shade.zts.athenz.shade.zts.org.jvnet.hk2.internal;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.ListIterator;
/**
* This object contains a list of values. The list is not always sorted, but will
* always be returned sorted.
*
* All of the methods on here must be called with lock held.
*
* @author jwells
*
*/
public class IndexedListData {
private final ArrayList> unsortedList = new ArrayList>();
private volatile boolean sorted = true;
public Collection> getSortedList() {
if (sorted) return unsortedList;
synchronized (this) {
if (sorted) return unsortedList;
if (unsortedList.size() <= 1) {
sorted = true;
return unsortedList;
}
Collections.sort(unsortedList, ServiceLocatorImpl.DESCRIPTOR_COMPARATOR);
sorted = true;
return unsortedList;
}
}
public synchronized void addDescriptor(SystemDescriptor descriptor) {
unsortedList.add(descriptor);
if (unsortedList.size() > 1) {
sorted = false;
}
else {
sorted = true;
}
descriptor.addList(this);
}
public synchronized void removeDescriptor(SystemDescriptor descriptor) {
ListIterator> iterator = unsortedList.listIterator();
while (iterator.hasNext()) {
SystemDescriptor candidate = iterator.next();
if (ServiceLocatorImpl.DESCRIPTOR_COMPARATOR.compare(descriptor, candidate) == 0) {
iterator.remove();
break;
}
}
if (unsortedList.size() > 1) {
sorted = false;
}
else {
sorted = true;
}
descriptor.removeList(this);
}
public synchronized boolean isEmpty() {
return unsortedList.isEmpty();
}
/**
* Called by a SystemDescriptor when its ranking has changed
*/
public synchronized void unSort() {
if (unsortedList.size() > 1) {
sorted = false;
}
}
public synchronized void clear() {
for (SystemDescriptor descriptor : unsortedList) {
descriptor.removeList(this);
}
unsortedList.clear();
}
public synchronized int size() {
return unsortedList.size();
}
}