org.apache.hadoop.hdfs.server.namenode

Class INodesInPath

java.lang.Object

org.apache.hadoop.hdfs.server.namenode.INodesInPath

public class INodesInPath
extends Object

Contains INodes information resolved from a given path.

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.commons.logging.Log	LOG

Method Summary

Modifier and Type	Method and Description
static INodesInPath	append(INodesInPath iip, org.apache.hadoop.hdfs.server.namenode.INode child, byte[] childName) Extend a given INodesInPath with a child INode.
INodesInPath	getExistingINodes()
org.apache.hadoop.hdfs.server.namenode.INode	getINode(int i)
org.apache.hadoop.hdfs.server.namenode.INode[]	getINodesArray()
org.apache.hadoop.hdfs.server.namenode.INode	getLastINode()
int	getLatestSnapshotId() For non-snapshot paths, return the latest snapshot id found in the path.
INodesInPath	getParentINodesInPath()
String	getParentPath()
String	getPath()
String	getPath(int pos)
List<String>	getPath(int offset, int length)
byte[][]	getPathComponents()
int	getPathSnapshotId() For snapshot paths, return the id of the snapshot specified in the path.
List<org.apache.hadoop.hdfs.server.namenode.INode>	getReadOnlyINodes()
int	length()
static INodesInPath	replace(INodesInPath iip, int pos, org.apache.hadoop.hdfs.server.namenode.INode inode) Replace an inode of the given INodesInPath in the given position.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

LOG

public static final org.apache.commons.logging.Log LOG

Method Detail

replace

public static INodesInPath replace(INodesInPath iip,
                                   int pos,
                                   org.apache.hadoop.hdfs.server.namenode.INode inode)

Replace an inode of the given INodesInPath in the given position. We do a deep copy of the INode array.

Parameters:

pos - the position of the replacement

inode - the new inode

Returns:

a new INodesInPath instance

append

public static INodesInPath append(INodesInPath iip,
                                  org.apache.hadoop.hdfs.server.namenode.INode child,
                                  byte[] childName)

Extend a given INodesInPath with a child INode. The child INode will be appended to the end of the new INodesInPath.

getLatestSnapshotId

public int getLatestSnapshotId()

For non-snapshot paths, return the latest snapshot id found in the path.

getPathSnapshotId

public int getPathSnapshotId()

For snapshot paths, return the id of the snapshot specified in the path. For non-snapshot paths, return Snapshot.CURRENT_STATE_ID.

getINode

public org.apache.hadoop.hdfs.server.namenode.INode getINode(int i)

Returns:

the i-th inode if i >= 0; otherwise, i < 0, return the (length + i)-th inode.

getLastINode

public org.apache.hadoop.hdfs.server.namenode.INode getLastINode()

Returns:

the last inode.

getPathComponents

public byte[][] getPathComponents()

getPath

public String getPath()

Returns:

the full path in string form

getParentPath

public String getParentPath()

getPath

public String getPath(int pos)

getPath

public List<String> getPath(int offset,
                            int length)

Parameters:

offset - start endpoint (inclusive)

length - number of path components

Returns:

sub-list of the path

length

public int length()

getReadOnlyINodes

public List<org.apache.hadoop.hdfs.server.namenode.INode> getReadOnlyINodes()

getINodesArray

public org.apache.hadoop.hdfs.server.namenode.INode[] getINodesArray()

getParentINodesInPath

public INodesInPath getParentINodesInPath()

Returns:

an INodesInPath instance containing all the INodes in the parent path. We do a deep copy here.

getExistingINodes

public INodesInPath getExistingINodes()

Returns:

a new INodesInPath instance that only contains exisitng INodes. Note that this method only handles non-snapshot paths.

toString

public String toString()

Overrides:

toString in class Object