FsPermission (Apache Hadoop Main 2.6.5 API)

java.lang.Object
- org.apache.hadoop.fs.permission.FsPermission

All Implemented Interfaces:: Writable

@InterfaceAudience.Public
@InterfaceStability.Stable
public class FsPermission
extends Object
implements Writable

A class for file/directory permissions.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`DEFAULT_UMASK`
`static String`	`DEPRECATED_UMASK_LABEL` umask property label deprecated key and code in getUMask method to accommodate it may be removed in version .23
`static int`	`MAX_PERMISSION_LENGTH` Maximum acceptable length of a permission string to parse
`static String`	`UMASK_LABEL`

Constructor Summary

Constructors
Constructor and Description
`FsPermission(FsAction u, FsAction g, FsAction o)` Construct by the given `FsAction`.
`FsPermission(FsAction u, FsAction g, FsAction o, boolean sb)`
`FsPermission(FsPermission other)` Copy constructor
`FsPermission(short mode)` Construct by the given mode.
`FsPermission(String mode)` Construct by given mode, either in octal or symbolic format.

Method Summary

Methods
Modifier and Type	Method and Description
`FsPermission`	`applyUMask(FsPermission umask)` Apply a umask to this permission and return a new one.
`static FsPermission`	`createImmutable(short permission)` Create an immutable `FsPermission` object.
`boolean`	`equals(Object obj)`
`void`	`fromShort(short n)`
`boolean`	`getAclBit()` Returns true if there is also an ACL (access control list).
`static FsPermission`	`getCachePoolDefault()` Get the default permission for cache pools.
`static FsPermission`	`getDefault()` Get the default permission for directory and symlink.
`static FsPermission`	`getDirDefault()` Get the default permission for directory.
`boolean`	`getEncryptedBit()` Returns true if the file is encrypted or directory is in an encryption zone
`static FsPermission`	`getFileDefault()` Get the default permission for file.
`FsAction`	`getGroupAction()` Return group `FsAction`.
`FsAction`	`getOtherAction()` Return other `FsAction`.
`boolean`	`getStickyBit()`
`static FsPermission`	`getUMask(Configuration conf)` Get the user file creation mask (umask) `UMASK_LABEL` config param has umask value that is either symbolic or octal.
`FsAction`	`getUserAction()` Return user `FsAction`.
`int`	`hashCode()`
`static FsPermission`	`read(DataInput in)` Create and initialize a `FsPermission` from `DataInput`.
`void`	`readFields(DataInput in)` Deserialize the fields of this object from `in`.
`static void`	`setUMask(Configuration conf, FsPermission umask)` Set the user file creation mask (umask)
`short`	`toExtendedShort()` Encodes the object to a short.
`short`	`toShort()` Encode the object to a short.
`String`	`toString()`
`static FsPermission`	`valueOf(String unixSymbolicPermission)` Create a FsPermission from a Unix symbolic permission string
`void`	`write(DataOutput out)` Serialize the fields of this object to `out`.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - MAX_PERMISSION_LENGTH
```
public static final int MAX_PERMISSION_LENGTH
```
    Maximum acceptable length of a permission string to parse
    
    See Also:
    Constant Field Values
  - DEPRECATED_UMASK_LABEL
```
public static final String DEPRECATED_UMASK_LABEL
```
    umask property label deprecated key and code in getUMask method to accommodate it may be removed in version .23
    
    See Also:
    Constant Field Values
  - UMASK_LABEL
```
public static final String UMASK_LABEL
```
    See Also:
    Constant Field Values
  - DEFAULT_UMASK
```
public static final int DEFAULT_UMASK
```
    See Also:
    Constant Field Values
- Constructor Detail
  - FsPermission
```
public FsPermission(FsAction u,
            FsAction g,
            FsAction o)
```
    Construct by the given FsAction.
    
    Parameters:
    u - user action
    g - group action
    o - other action
  - FsPermission
```
public FsPermission(FsAction u,
            FsAction g,
            FsAction o,
            boolean sb)
```
  - FsPermission
```
public FsPermission(short mode)
```
    Construct by the given mode.
    
    Parameters:
    mode -
    See Also:
    toShort()
  - FsPermission
```
public FsPermission(FsPermission other)
```
    Copy constructor
    
    Parameters:
    other - other permission
  - FsPermission
```
public FsPermission(String mode)
```
    Construct by given mode, either in octal or symbolic format.
    
    Parameters:
    mode - mode as a string, either in octal or symbolic format
    
    Throws:
    
    IllegalArgumentException - if mode is invalid
- Method Detail
  - createImmutable
```
public static FsPermission createImmutable(short permission)
```
    Create an immutable FsPermission object.
  - getUserAction
```
public FsAction getUserAction()
```
    Return user FsAction.
  - getGroupAction
```
public FsAction getGroupAction()
```
    Return group FsAction.
  - getOtherAction
```
public FsAction getOtherAction()
```
    Return other FsAction.
  - fromShort
```
public void fromShort(short n)
```
  - write
```
public void write(DataOutput out)
           throws IOException
```
    Description copied from interface: Writable
    
    Serialize the fields of this object to out.
    
    Specified by:
    
    write in interface Writable
    
    Parameters:
    out - DataOuput to serialize this object into.
    
    Throws:
    
    IOException
  - readFields
```
public void readFields(DataInput in)
                throws IOException
```
    Description copied from interface: Writable
    
    Deserialize the fields of this object from in.
    For efficiency, implementations should attempt to re-use storage in the existing object where possible.
    
    Specified by:
    
    readFields in interface Writable
    
    Parameters:
    in - DataInput to deseriablize this object from.
    
    Throws:
    
    IOException
  - read
```
public static FsPermission read(DataInput in)
                         throws IOException
```
    Create and initialize a FsPermission from DataInput.
    
    Throws:
    
    IOException
  - toShort
```
public short toShort()
```
    Encode the object to a short.
  - toExtendedShort
```
public short toExtendedShort()
```
    Encodes the object to a short. Unlike toShort(), this method may return values outside the fixed range 00000 - 01777 if extended features are encoded into this permission, such as the ACL bit.
    
    Returns:
    short extended short representation of this permission
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - applyUMask
```
public FsPermission applyUMask(FsPermission umask)
```
    Apply a umask to this permission and return a new one. The umask is used by create, mkdir, and other Hadoop filesystem operations. The mode argument for these operations is modified by removing the bits which are set in the umask. Thus, the umask limits the permissions which newly created files and directories get.
    
    Parameters:
    umask - The umask to use
    
    Returns:
    The effective permission
  - getUMask
```
public static FsPermission getUMask(Configuration conf)
```
    Get the user file creation mask (umask) UMASK_LABEL config param has umask value that is either symbolic or octal. Symbolic umask is applied relative to file mode creation mask; the permission op characters '+' clears the corresponding bit in the mask, '-' sets bits in the mask. Octal umask, the specified bits are set in the file mode creation mask. DEPRECATED_UMASK_LABEL config param has umask value set to decimal.
  - getStickyBit
```
public boolean getStickyBit()
```
  - getAclBit
```
public boolean getAclBit()
```
    Returns true if there is also an ACL (access control list).
    
    Returns:
    boolean true if there is also an ACL (access control list).
  - getEncryptedBit
```
public boolean getEncryptedBit()
```
    Returns true if the file is encrypted or directory is in an encryption zone
  - setUMask
```
public static void setUMask(Configuration conf,
            FsPermission umask)
```
    Set the user file creation mask (umask)
  - getDefault
```
public static FsPermission getDefault()
```
    Get the default permission for directory and symlink. In previous versions, this default permission was also used to create files, so files created end up with ugo+x permission. See HADOOP-9155 for detail. Two new methods are added to solve this, please use getDirDefault() for directory, and use getFileDefault() for file. This method is kept for compatibility.
  - getDirDefault
```
public static FsPermission getDirDefault()
```
    Get the default permission for directory.
  - getFileDefault
```
public static FsPermission getFileDefault()
```
    Get the default permission for file.
  - getCachePoolDefault
```
public static FsPermission getCachePoolDefault()
```
    Get the default permission for cache pools.
  - valueOf
```
public static FsPermission valueOf(String unixSymbolicPermission)
```
    Create a FsPermission from a Unix symbolic permission string
    
    Parameters:
    unixSymbolicPermission - e.g. "-rw-rw-rw-"

Class FsPermission

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

MAX_PERMISSION_LENGTH

DEPRECATED_UMASK_LABEL

UMASK_LABEL

DEFAULT_UMASK

Constructor Detail

FsPermission

FsPermission

FsPermission

FsPermission

FsPermission

Method Detail

createImmutable

getUserAction

getGroupAction

getOtherAction

fromShort

write

readFields

read

toShort

toExtendedShort

equals

hashCode

toString

applyUMask

getUMask

getStickyBit

getAclBit

getEncryptedBit

setUMask

getDefault

getDirDefault

getFileDefault

getCachePoolDefault

valueOf