Package org.apache.hadoop.fs.shell

Class TouchCommands.Touchz

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.fs.shell.Command

org.apache.hadoop.fs.shell.FsCommand

org.apache.hadoop.fs.shell.TouchCommands

org.apache.hadoop.fs.shell.TouchCommands.Touchz

All Implemented Interfaces:

Configurable

Enclosing class:

TouchCommands

public static class TouchCommands.Touchz
extends TouchCommands

(Re)create zero-length file at the specified path. This will be replaced by a more UNIX-like touch when files may be modified.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.fs.shell.TouchCommands

TouchCommands.Touch, TouchCommands.Touchz

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DESCRIPTION
static final String	NAME
static final String	USAGE

Fields inherited from class org.apache.hadoop.fs.shell.Command

args, COMMAND_DESCRIPTION_FIELD, COMMAND_NAME_FIELD, COMMAND_USAGE_FIELD, err, exceptions, exitCode, name, numErrors, out, recursive

Constructor Summary

Constructors

Constructor	Description
Touchz()

Method Summary

Modifier and Type	Method	Description
protected void	processNonexistentPath(PathData item)	Provides a hook for handling paths that don't exist.
protected void	processOptions(LinkedList<String> args)	Must be implemented by commands to process the command line flags and check the bounds of the remaining arguments.
protected void	processPath(PathData item)	Hook for commands to implement an operation to be applied on each path for the command.

Methods inherited from class org.apache.hadoop.fs.shell.TouchCommands

registerCommands

Methods inherited from class org.apache.hadoop.fs.shell.FsCommand

getCommandName, processRawArguments, run, runAll

Methods inherited from class org.apache.hadoop.fs.shell.Command

displayError, displayError, displayWarning, exitCodeForError, expandArgument, expandArguments, getCommandFactory, getDepth, getDescription, getListingGroupSize, getName, getReplacementCommand, getUsage, isDeprecated, isPathRecursable, isRecursive, isSorted, postProcessPath, processArgument, processArguments, processPathArgument, processPaths, processPaths, recursePath, run, run, setCommandFactory, setName, setRecursive

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Field Details

NAME

public static final String NAME

See Also:

• Constant Field Values

USAGE

public static final String USAGE

See Also:

• Constant Field Values

DESCRIPTION

public static final String DESCRIPTION

See Also:

• Constant Field Values

Constructor Details

Touchz

public Touchz()

Method Details

processOptions

protected void processOptions(LinkedList<String> args)

Description copied from class: Command

Must be implemented by commands to process the command line flags and check the bounds of the remaining arguments. If an IllegalArgumentException is thrown, the FsShell object will print the short usage of the command.

Overrides:

processOptions in class Command

Parameters:

args - the command line arguments

processPath

protected void processPath(PathData item)
                    throws IOException

Description copied from class: Command

Hook for commands to implement an operation to be applied on each path for the command. Note implementation of this method is optional if earlier methods in the chain handle the operation.

Overrides:

processPath in class Command

Parameters:

item - a PathData object

Throws:

IOException - if anything else goes wrong in the user-implementation

processNonexistentPath

protected void processNonexistentPath(PathData item)
                               throws IOException

Description copied from class: Command

Provides a hook for handling paths that don't exist. By default it will throw an exception. Primarily overriden by commands that create paths such as mkdir or touch.

Overrides:

processNonexistentPath in class Command

Parameters:

item - the PathData that doesn't exist

Throws:

FileNotFoundException - if arg is a path and it doesn't exist

IOException - if anything else goes wrong...