Java: Class PosixFilePermissions
Giải phóng thời gian, khai phóng năng lực
java.lang.Object
java.nio.file.attribute.PosixFilePermissions
public final class PosixFilePermissions extends Object
PosixFilePermission
objects.Since:
1.7
Method Summary
Modifier and Type | Method and Description |
---|---|
static FileAttribute<Set<PosixFilePermission>> |
Creates a
FileAttribute , encapsulating a copy of the given file permissions, suitable for passing to the createFile orcreateDirectory methods. |
static Set<PosixFilePermission> |
Returns the set of permissions corresponding to a given
String representation. |
static String |
Returns the
String representation of a set of permissions. |
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Method Detail
toString
public static String toString(Set<PosixFilePermission> perms)
Returns the String
representation of a set of permissions. It is guaranteed that the returned String
can be parsed by thefromString(java.lang.String)
method.
If the set contains null
or elements that are not of type PosixFilePermission
then these elements are ignored.
Parameters:
perms
- the set of permissions
Returns:
the string representation of the permission set
fromString
public static Set<PosixFilePermission> fromString(String perms)
Returns the set of permissions corresponding to a given String
representation.
The perms
parameter is a String
representing the permissions. It has 9 characters that are interpreted as three sets of three. The first set refers to the owner's permissions; the next to the group permissions and the last to others. Within each set, the first character is 'r'
to indicate permission to read, the second character is 'w'
to indicate permission to write, and the third character is 'x'
for execute permission. Where a permission is not set then the corresponding character is set to '-'
.
Usage Example: Suppose we require the set of permissions that indicate the owner has read, write, and execute permissions, the group has read and execute permissions and others have none.
Set<PosixFilePermission> perms = PosixFilePermissions.fromString("rwxr-x---");
Parameters:
perms
- string representing a set of permissions
Returns:
the resulting set of permissions
Throws:
IllegalArgumentException
- if the string cannot be converted to a set of permissions
See Also:
toString(Set)
asFileAttribute
public static FileAttribute<Set<PosixFilePermission>> asFileAttribute(Set<PosixFilePermission> perms)
FileAttribute
, encapsulating a copy of the given file permissions, suitable for passing to the createFile
orcreateDirectory
methods.Parameters:
perms
- the set of permissions
Returns:
an attribute encapsulating the given file permissions with name
"posix:permissions"
Throws:
ClassCastException
- if the set contains elements that are not of type PosixFilePermission
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