135 lines
3.7 KiB
Java
135 lines
3.7 KiB
Java
/*
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* Copyright (c) 2007, 2009, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package it.cavallium.warppi.deps;
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import java.nio.file.LinkOption;
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/**
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* Defines the standard open options.
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*
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* @since 1.7
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*/
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public enum DStandardOpenOption {
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/**
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* Open for read access.
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*/
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READ,
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/**
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* Open for write access.
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*/
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WRITE,
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/**
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* If the file is opened for {@link #WRITE} access then bytes will be
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* written
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* to the end of the file rather than the beginning.
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*
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* <p>
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* If the file is opened for write access by other programs, then it
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* is file system specific if writing to the end of the file is atomic.
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*/
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APPEND,
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/**
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* If the file already exists and it is opened for {@link #WRITE}
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* access, then its length is truncated to 0. This option is ignored
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* if the file is opened only for {@link #READ} access.
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*/
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TRUNCATE_EXISTING,
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/**
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* Create a new file if it does not exist.
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* This option is ignored if the {@link #CREATE_NEW} option is also set.
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* The check for the existence of the file and the creation of the file
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* if it does not exist is atomic with respect to other file system
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* operations.
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*/
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CREATE,
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/**
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* Create a new file, failing if the file already exists.
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* The check for the existence of the file and the creation of the file
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* if it does not exist is atomic with respect to other file system
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* operations.
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*/
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CREATE_NEW,
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/**
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* Delete on close. When this option is present then the implementation
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* makes a <em>best effort</em> attempt to delete the file when closed
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* by the appropriate {@code close} method. If the {@code close} method is
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* not invoked then a <em>best effort</em> attempt is made to delete the
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* file when the Java virtual machine terminates (either normally, as
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* defined by the Java Language Specification, or where possible,
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* abnormally).
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* This option is primarily intended for use with <em>work files</em> that
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* are used solely by a single instance of the Java virtual machine. This
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* option is not recommended for use when opening files that are open
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* concurrently by other entities. Many of the details as to when and how
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* the file is deleted are implementation specific and therefore not
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* specified. In particular, an implementation may be unable to guarantee
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* that it deletes the expected file when replaced by an attacker while the
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* file is open. Consequently, security sensitive applications should take
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* care when using this option.
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*
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* <p>
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* For security reasons, this option may imply the {@link
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* LinkOption#NOFOLLOW_LINKS} option. In other words, if the option is
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* present
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* when opening an existing file that is a symbolic link then it may fail
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* (by throwing {@link java.io.IOException}).
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*/
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DELETE_ON_CLOSE,
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/**
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* Sparse file. When used with the {@link #CREATE_NEW} option then this
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* option provides a <em>hint</em> that the new file will be sparse. The
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* option is ignored when the file system does not support the creation of
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* sparse files.
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*/
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SPARSE,
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/**
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* Requires that every update to the file's content or metadata be written
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* synchronously to the underlying storage device.
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*
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* @see <a href="package-summary.html#integrity">Synchronized I/O file
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* integrity</a>
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*/
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SYNC,
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/**
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* Requires that every update to the file's content be written
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* synchronously to the underlying storage device.
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*
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* @see <a href="package-summary.html#integrity">Synchronized I/O file
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* integrity</a>
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*/
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DSYNC;
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}
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