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HADOOP-12209 Comparable type should be in FileStatus. (Yong Zhang via stevel)

This commit is contained in:
Steve Loughran 2015-07-20 12:32:32 +01:00
parent 05130e94c5
commit 9141e1aa16
5 changed files with 35 additions and 18 deletions
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3
hadoop-common-project/hadoop-common/CHANGES.txt
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@ -972,6 +972,9 @@ Release 2.8.0 - UNRELEASED
HADOOP-12235 hadoop-openstack junit & mockito dependencies should be
"provided". (Ted Yu via stevel)
HADOOP-12209 Comparable type should be in FileStatus.
(Yong Zhang via stevel)
Release 2.7.2 - UNRELEASED
INCOMPATIBLE CHANGES

15
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileStatus.java
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@ -31,7 +31,7 @@ import org.apache.hadoop.io.Writable;
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class FileStatus implements Writable, Comparable {
public class FileStatus implements Writable, Comparable<FileStatus> {
private Path path;
private long length;
@ -323,19 +323,14 @@ public class FileStatus implements Writable, Comparable {
}
/**
* Compare this object to another object
*
* @param o the object to be compared.
* Compare this FileStatus to another FileStatus
* @param o the FileStatus to be compared.
* @return a negative integer, zero, or a positive integer as this object
* is less than, equal to, or greater than the specified object.
*
* @throws ClassCastException if the specified object's is not of
* type FileStatus
*/
@Override
public int compareTo(Object o) {
FileStatus other = (FileStatus)o;
return this.getPath().compareTo(other.getPath());
public int compareTo(FileStatus o) {
return this.getPath().compareTo(o.getPath());
}
/** Compare if this object is equal to another object

10
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/LocatedFileStatus.java
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@ -90,17 +90,13 @@ public class LocatedFileStatus extends FileStatus {
}
/**
* Compare this object to another object
*
* @param o the object to be compared.
* Compare this FileStatus to another FileStatus
* @param o the FileStatus to be compared.
* @return a negative integer, zero, or a positive integer as this object
* is less than, equal to, or greater than the specified object.
*
* @throws ClassCastException if the specified object's is not of
* type FileStatus
*/
@Override
public int compareTo(Object o) {
public int compareTo(FileStatus o) {
return super.compareTo(o);
}

3
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFsLocatedFileStatus.java
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@ -18,6 +18,7 @@
package org.apache.hadoop.fs.viewfs;
import org.apache.hadoop.fs.BlockLocation;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.LocatedFileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
@ -120,7 +121,7 @@ class ViewFsLocatedFileStatus extends LocatedFileStatus {
}
@Override
public int compareTo(Object o) {
public int compareTo(FileStatus o) {
return super.compareTo(o);
}

22
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/TestFileStatus.java
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@ -26,6 +26,9 @@ import java.io.DataInputStream;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.junit.Test;
import org.apache.commons.logging.Log;
@ -183,6 +186,25 @@ public class TestFileStatus {
validateToString(fileStatus);
}
@Test
public void testCompareTo() throws IOException {
Path path1 = new Path("path1");
Path path2 = new Path("path2");
FileStatus fileStatus1 =
new FileStatus(1, true, 1, 1, 1, 1, FsPermission.valueOf("-rw-rw-rw-"),
"one", "one", null, path1);
FileStatus fileStatus2 =
new FileStatus(1, true, 1, 1, 1, 1, FsPermission.valueOf("-rw-rw-rw-"),
"one", "one", null, path2);
assertTrue(fileStatus1.compareTo(fileStatus2) < 0);
assertTrue(fileStatus2.compareTo(fileStatus1) > 0);
List<FileStatus> statList = new ArrayList<>();
statList.add(fileStatus1);
statList.add(fileStatus2);
assertTrue(Collections.binarySearch(statList, fileStatus1) > -1);
}
/**
* Check that toString produces the expected output for a symlink.
*/