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BufferChunkList.java
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62 lines (56 loc) · 1.6 KB
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/*
* 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.orc.impl;
/**
* Builds a list of buffer chunks
* @since 1.6.0
*/
public class BufferChunkList {
private BufferChunk head;
private BufferChunk tail;
public void add(BufferChunk value) {
if (head == null) {
head = value;
tail = value;
} else {
tail.next = value;
value.prev = tail;
value.next = null;
tail = value;
}
}
public BufferChunk get() {
return head;
}
/**
* Get the nth element of the list
* @param chunk the element number to get from 0
* @return the given element number
*/
public BufferChunk get(int chunk) {
BufferChunk ptr = head;
for(int i=0; i < chunk; ++i) {
ptr = ptr == null ? null : (BufferChunk) ptr.next;
}
return ptr;
}
public void clear() {
head = null;
tail = null;
}
}