hadoop DirectoryListing 源码
haddop DirectoryListing 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/DirectoryListing.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.protocol;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* This class defines a partial listing of a directory to support
* iterative directory listing.
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class DirectoryListing {
private HdfsFileStatus[] partialListing;
private int remainingEntries;
/**
* constructor
* @param partialListing a partial listing of a directory
* @param remainingEntries number of entries that are left to be listed
*/
public DirectoryListing(HdfsFileStatus[] partialListing,
int remainingEntries) {
if (partialListing == null) {
throw new IllegalArgumentException("partial listing should not be null");
}
if (partialListing.length == 0 && remainingEntries != 0) {
throw new IllegalArgumentException("Partial listing is empty but " +
"the number of remaining entries is not zero");
}
this.partialListing = partialListing;
this.remainingEntries = remainingEntries;
}
/**
* Get the partial listing of file status
* @return the partial listing of file status
*/
public HdfsFileStatus[] getPartialListing() {
return partialListing;
}
/**
* Get the number of remaining entries that are left to be listed
* @return the number of remaining entries that are left to be listed
*/
public int getRemainingEntries() {
return remainingEntries;
}
/**
* Check if there are more entries that are left to be listed
* @return true if there are more entries that are left to be listed;
* return false otherwise.
*/
public boolean hasMore() {
return remainingEntries != 0;
}
/**
* Get the last name in this list
* @return the last name in the list if it is not empty; otherwise return null
*/
public byte[] getLastName() {
if (partialListing.length == 0) {
return null;
}
return partialListing[partialListing.length-1].getLocalNameInBytes();
}
}
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