/**
* 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 org.apache.hadoop.hive.ql.exec.persistence;
/**
* Doubly circular linked list item.
*/
public class DCLLItem {
DCLLItem prev;
DCLLItem next;
DCLLItem() {
prev = next = this;
}
/**
* Get the next item.
*
* @return the next item.
*/
public DCLLItem getNext() {
return next;
}
/**
* Get the previous item.
*
* @return the previous item.
*/
public DCLLItem getPrev() {
return prev;
}
/**
* Set the next item as itm.
*
* @param itm
* the item to be set as next.
*/
public void setNext(DCLLItem itm) {
next = itm;
}
/**
* Set the previous item as itm.
*
* @param itm
* the item to be set as previous.
*/
public void setPrev(DCLLItem itm) {
prev = itm;
}
/**
* Remove the current item from the doubly circular linked list.
*/
public void remove() {
next.prev = prev;
prev.next = next;
prev = next = null;
}
/**
* Add v as the previous of the current list item.
*
* @param v
* inserted item.
*/
public void insertBefore(DCLLItem v) {
prev.next = v;
v.prev = prev;
v.next = this;
prev = v;
}
/**
* Add v as the previous of the current list item.
*
* @param v
* inserted item.
*/
public void insertAfter(DCLLItem v) {
next.prev = v;
v.next = next;
v.prev = this;
next = v;
}
}