/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

package accord.utils;

/**
 * TODO (low priority): COPIED FROM CASSANDRA
 */
public abstract class IntrusiveLinkedListNode
{
    IntrusiveLinkedListNode prev;
    IntrusiveLinkedListNode next;

    protected boolean isFree()
    {
        return next == null;
    }

    protected void remove()
    {
        if (next != null)
        {
            prev.next = next;
            next.prev = prev;
            next = null;
            prev = null;
        }
        Invariants.paranoid(prev == null);
    }
}
