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HADOOP-17686. Avoid potential NPE by using Path#getParentPath API in hadoop-huaweicloud (#2990) 

Signed-off-by: Takanobu Asanuma <tasanuma@apache.org>
This commit is contained in:
Viraj Jasani 2021-05-12 07:04:01 +05:30 committed by GitHub
parent b944084b32
commit c80f07422f
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2 changed files with 29 additions and 6 deletions
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9
hadoop-cloud-storage-project/hadoop-huaweicloud/src/main/java/org/apache/hadoop/fs/obs/OBSObjectBucketUtils.java
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@ -55,6 +55,7 @@
import java.util.Comparator;
import java.util.LinkedList;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ExecutionException;
@ -872,8 +873,12 @@ private static void getDirectories(final String key, final String sourceKey,
directories.add(p.toString());
}
while (p.compareTo(sourcePath) > 0) {
p = p.getParent();
if (p.isRoot() || p.compareTo(sourcePath) == 0) {
Optional<Path> parent = p.getOptionalParentPath();
if (!parent.isPresent()) {
break;
}
p = parent.get();
if (p.compareTo(sourcePath) == 0) {
break;
}
directories.add(p.toString());

26
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/Path.java
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@ -24,6 +24,7 @@
import java.io.Serializable;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Optional;
import java.util.regex.Pattern;
import org.apache.avro.reflect.Stringable;
@ -420,22 +421,39 @@ public String getName() {
}
/**
* Returns the parent of a path or null if at root.
* Returns the parent of a path or null if at root. Better alternative is
* {@link #getOptionalParentPath()} to handle nullable value for root path.
*
* @return the parent of a path or null if at root
*/
public Path getParent() {
return getParentUtil();
}
/**
* Returns the parent of a path as {@link Optional} or
* {@link Optional#empty()} i.e an empty Optional if at root.
*
* @return Parent of path wrappen in {@link Optional}.
* {@link Optional#empty()} i.e an empty Optional if at root.
*/
public Optional<Path> getOptionalParentPath() {
return Optional.ofNullable(getParentUtil());
}
private Path getParentUtil() {
String path = uri.getPath();
int lastSlash = path.lastIndexOf('/');
int start = startPositionWithoutWindowsDrive(path);
if ((path.length() == start) || // empty path
(lastSlash == start && path.length() == start+1)) { // at root
(lastSlash == start && path.length() == start + 1)) { // at root
return null;
}
String parent;
if (lastSlash==-1) {
if (lastSlash == -1) {
parent = CUR_DIR;
} else {
parent = path.substring(0, lastSlash==start?start+1:lastSlash);
parent = path.substring(0, lastSlash == start ? start + 1 : lastSlash);
}
return new Path(uri.getScheme(), uri.getAuthority(), parent);
}