hadoop DiffListByArrayList 源码
haddop DiffListByArrayList 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DiffListByArrayList.java
/**
* 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.hdfs.server.namenode.snapshot;
import org.apache.hadoop.hdfs.server.namenode.INodeDirectory;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
/**
* Resizable-array implementation of the DiffList interface.
* @param <T> Type of the object in the list
*/
public class DiffListByArrayList<T extends Comparable<Integer>>
implements DiffList<T> {
private final List<T> list;
DiffListByArrayList(List<T> list) {
this.list = list;
}
public DiffListByArrayList(int initialCapacity) {
this(new ArrayList<>(initialCapacity));
}
@Override
public T get(int i) {
return list.get(i);
}
@Override
public boolean isEmpty() {
return list.isEmpty();
}
@Override
public int size() {
return list.size();
}
@Override
public T remove(int i) {
// DeletionOrdered: only can remove the element at index 0
assert !SnapshotManager.isDeletionOrdered() || i == 0;
return list.remove(i);
}
@Override
public boolean addLast(T t) {
return list.add(t);
}
@Override
public void addFirst(T t) {
list.add(0, t);
}
@Override
public int binarySearch(int i) {
return Collections.binarySearch(list, i);
}
@Override
public Iterator<T> iterator() {
return list.iterator();
}
@Override
public List<T> getMinListForRange(int startIndex, int endIndex,
INodeDirectory dir) {
return list.subList(startIndex, endIndex);
}
}
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