Enum Class StandardOpenOption

java.lang.Object

java.lang.Enum<StandardOpenOption>

java.nio.file.StandardOpenOption

All Implemented Interfaces:

Serializable, Comparable<StandardOpenOption>, Constable, OpenOption

public enum StandardOpenOption
extends Enum<StandardOpenOption>
implements OpenOption

Defines the standard open options.

Since:

1.7

Nested Class Summary

Nested classes/interfaces declared in class Enum

Enum.EnumDesc<E>

Modifier and Type	Class	Description
static final class	Enum.EnumDesc<E extends Enum<E>>	A nominal descriptor for an enum constant.

Enum Constant Summary

Enum Constants

Enum Constant	Description
APPEND	If the file is opened for WRITE access then bytes will be written to the end of the file rather than the beginning.
CREATE	Create a new file if it does not exist.
CREATE_NEW	Create a new file, failing if the file already exists.
DELETE_ON_CLOSE	Delete on close.
DSYNC	Requires that every update to the file's content be written synchronously to the underlying storage device.
READ	Open for read access.
SPARSE	Sparse file.
SYNC	Requires that every update to the file's content or metadata be written synchronously to the underlying storage device.
TRUNCATE_EXISTING	If the file already exists and it is opened for WRITE access, then its length is truncated to 0.
WRITE	Open for write access.

Method Summary

Modifier and Type	Method	Description
static StandardOpenOption	valueOf(String name)	Returns the enum constant of this class with the specified name.
static StandardOpenOption[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods declared in class Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Modifier and Type	Method	Description
protected final Object	clone()	Throws CloneNotSupportedException.
final int	compareTo(StandardOpenOption o)	Compares this enum with the specified object for order.
final Optional<Enum.EnumDesc<StandardOpenOption>>	describeConstable()	Returns an enum descriptor EnumDesc for this instance, if one can be constructed, or an empty Optional if one cannot be.
final boolean	equals(Object other)	Returns true if the specified object is equal to this enum constant.
protected final void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. Finalization has been deprecated for removal.
final Class<StandardOpenOption>	getDeclaringClass()	Returns the Class object corresponding to this enum constant's enum type.
final int	hashCode()	Returns a hash code for this enum constant.
final String	name()	Returns the name of this enum constant, exactly as declared in its enum declaration.
final int	ordinal()	Returns the ordinal of this enumeration constant (its position in its enum declaration, where the initial constant is assigned an ordinal of zero).
String	toString()	Returns the name of this enum constant, as contained in the declaration.
static <T extends Enum<T>> T	valueOf(Class<T> enumClass, String name)	Returns the enum constant of the specified enum class with the specified name.

Methods declared in class Object

getClass, notify, notifyAll, wait, wait, wait

Modifier and Type	Method	Description
final Class<? extends Object>	getClass()	Answers the unique instance of java.lang.Class which represents the class of the receiver.
final void	notify()	Causes one thread which is waiting on the receiver to be made ready to run.
final void	notifyAll()	Causes all threads which are waiting on the receiver to be made ready to run.
final void	wait()	Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
final void	wait(long time)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
final void	wait(long time, int frac)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

Enum Constant Details

READ

public static final StandardOpenOption READ

Open for read access.

WRITE

public static final StandardOpenOption WRITE

Open for write access.

APPEND

public static final StandardOpenOption APPEND

If the file is opened for WRITE access then bytes will be written to the end of the file rather than the beginning.

If the file is opened for write access by other programs, then it is file system specific if writing to the end of the file is atomic.

TRUNCATE_EXISTING

public static final StandardOpenOption TRUNCATE_EXISTING

If the file already exists and it is opened for WRITE access, then its length is truncated to 0. This option is ignored if the file is opened only for READ access.

CREATE

public static final StandardOpenOption CREATE

Create a new file if it does not exist. This option is ignored if the CREATE_NEW option is also set. The check for the existence of the file and the creation of the file if it does not exist is atomic with respect to other file system operations.

CREATE_NEW

public static final StandardOpenOption CREATE_NEW

Create a new file, failing if the file already exists. The check for the existence of the file and the creation of the file if it does not exist is atomic with respect to other file system operations.

DELETE_ON_CLOSE

public static final StandardOpenOption DELETE_ON_CLOSE

Delete on close. When this option is present then the implementation makes a best effort attempt to delete the file when closed by the appropriate close method. If the close method is not invoked then a best effort attempt is made to delete the file when the Java virtual machine terminates (either normally, as defined by the Java Language Specification, or where possible, abnormally). This option is primarily intended for use with work files that are used solely by a single instance of the Java virtual machine. This option is not recommended for use when opening files that are open concurrently by other entities. Many of the details as to when and how the file is deleted are implementation specific and therefore not specified. In particular, an implementation may be unable to guarantee that it deletes the expected file when replaced by an attacker while the file is open. Consequently, security sensitive applications should take care when using this option.

For security reasons, this option may imply the LinkOption.NOFOLLOW_LINKS option. In other words, if the option is present when opening an existing file that is a symbolic link then it may fail (by throwing IOException).

SPARSE

public static final StandardOpenOption SPARSE

Sparse file. When used with the CREATE_NEW option then this option provides a hint that the new file will be sparse. The option is ignored when the file system does not support the creation of sparse files.

SYNC

public static final StandardOpenOption SYNC

Requires that every update to the file's content or metadata be written synchronously to the underlying storage device.

See Also:

• Synchronized I/O file integrity

DSYNC

public static final StandardOpenOption DSYNC

Requires that every update to the file's content be written synchronously to the underlying storage device.

See Also:

• Synchronized I/O file integrity

Method Details

values

public static StandardOpenOption[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static StandardOpenOption valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null