public Class JRubyFile

Hides java.io.File.createTempFile.

Doc from java.io.File.createTempFile.

Creates a new empty file in the specified directory, using the given prefix and suffix strings to generate its name. If this method returns successfully then it is guaranteed that:

1. The file denoted by the returned abstract pathname did not exist before this method was invoked, and
2. Neither this method nor any of its variants will return the same abstract pathname again in the current invocation of the virtual machine.

The prefix argument must be at least three characters long. It is recommended that the prefix be a short, meaningful string such as "hjb" or "mail". The suffix argument may be null, in which case the suffix ".tmp" will be used.

To create the new file, the prefix and the suffix may first be adjusted to fit the limitations of the underlying platform. If the prefix is too long then it will be truncated, but its first three characters will always be preserved. If the suffix is too long then it too will be truncated, but if it begins with a period character ('.') then the period and the first three characters following it will always be preserved. Once these adjustments have been made the name of the new file will be generated by concatenating the prefix, five or more internally-generated characters, and the suffix.

If a file with the generated name cannot be created by the underlying platform, then an IOException will be thrown. This could occur for example if the supplied prefix or suffix contains one or more characters not supported by the underlying file system.

If the directory argument is null then the system-dependent default temporary-file directory will be used. The default temporary-file directory is specified by the system property java.io.tmpdir. On UNIX systems the default value of this property is typically "/tmp" or "/var/tmp"; on Microsoft Windows systems it is typically "C:\\WINNT\\TEMP". A different value may be given to this system property when the Java virtual machine is invoked, but programmatic changes to this property are not guaranteed to have any effect upon the temporary directory used by this method.

If the directory argument is not null and its abstract pathname is valid and denotes an existing, writable directory, then the file will be created in that directory. Otherwise the file will not be created and an IOException will be thrown. Under no circumstances will a directory be created at the location specified by the directory argument.

Parameters

prefix:String

The prefix string to be used in generating the file's name; must be at least three characters long

suffix:String

The suffix string to be used in generating the file's name; may be null, in which case the suffix ".tmp" will be used

directory:File

The directory in which the file is to be created, or null if the default temporary-file directory is to be used

Returns:File

An abstract pathname denoting a newly-created empty file

Exceptions

IOException:

If a file could not be created

Hides java.io.File.createTempFile.

Doc from java.io.File.createTempFile.

Creates an empty file in the default temporary-file directory, using the given prefix and suffix to generate its name. Invoking this method is equivalent to invoking createTempFile(prefix, suffix, null).

The Files.createTempFile method provides an alternative method to create an empty file in the temporary-file directory. Files created by that method may have more restrictive access permissions to files created by this method and so may be more suited to security-sensitive applications.

Parameters

prefix:String

The prefix string to be used in generating the file's name; must be at least three characters long

suffix:String

The suffix string to be used in generating the file's name; may be null, in which case the suffix ".tmp" will be used

Returns:File

An abstract pathname denoting a newly-created empty file

Exceptions

IOException:

If a file could not be created

Overrides jnr.posix.JavaSecuredFile.getAbsoluteFile.

Doc from java.io.File.getAbsoluteFile.

Returns the absolute form of this abstract pathname. Equivalent to new File(this.getAbsolutePath).

Returns:File

The absolute abstract pathname denoting the same file or directory as this abstract pathname

Annotations

@Override

Overrides java.io.File.getAbsolutePath.

Doc from java.io.File.getAbsolutePath.

Returns the absolute pathname string of this abstract pathname.

If this abstract pathname is already absolute, then the pathname string is simply returned as if by the getPath method. If this abstract pathname is the empty abstract pathname then the pathname string of the current user directory, which is named by the system property user.dir, is returned. Otherwise this pathname is resolved in a system-dependent way. On UNIX systems, a relative pathname is made absolute by resolving it against the current user directory. On Microsoft Windows systems, a relative pathname is made absolute by resolving it against the current directory of the drive named by the pathname, if any; if not, it is resolved against the current user directory.

Returns:String

The absolute pathname string denoting the same file or directory as this abstract pathname

Annotations

@Override

Overrides jnr.posix.JavaSecuredFile.getCanonicalFile.

Doc from java.io.File.getCanonicalFile.

Returns the canonical form of this abstract pathname. Equivalent to new File(this.getCanonicalPath).

Returns:File

The canonical pathname string denoting the same file or directory as this abstract pathname

Annotations

@Override

Exceptions

IOException:

If an I/O error occurs, which is possible because the construction of the canonical pathname may require filesystem queries

Overrides jnr.posix.JavaSecuredFile.getCanonicalPath.

Doc from java.io.File.getCanonicalPath.

Returns the canonical pathname string of this abstract pathname.

A canonical pathname is both absolute and unique. The precise definition of canonical form is system-dependent. This method first converts this pathname to absolute form if necessary, as if by invoking the getAbsolutePath method, and then maps it to its unique form in a system-dependent way. This typically involves removing redundant names such as "." and ".." from the pathname, resolving symbolic links (on UNIX platforms), and converting drive letters to a standard case (on Microsoft Windows platforms).

Every pathname that denotes an existing file or directory has a unique canonical form. Every pathname that denotes a nonexistent file or directory also has a unique canonical form. The canonical form of the pathname of a nonexistent file or directory may be different from the canonical form of the same pathname after the file or directory is created. Similarly, the canonical form of the pathname of an existing file or directory may be different from the canonical form of the same pathname after the file or directory is deleted.

Returns:String

The canonical pathname string denoting the same file or directory as this abstract pathname

Annotations

@Override

Exceptions

IOException:

If an I/O error occurs, which is possible because the construction of the canonical pathname may require filesystem queries

Overrides java.io.File.getParent.

Doc from java.io.File.getParent.

Returns the pathname string of this abstract pathname's parent, or null if this pathname does not name a parent directory.

The parent of an abstract pathname consists of the pathname's prefix, if any, and each name in the pathname's name sequence except for the last. If the name sequence is empty then the pathname does not name a parent directory.

Returns:String

The pathname string of the parent directory named by this abstract pathname, or null if this pathname does not name a parent

Annotations

@Override

Overrides jnr.posix.JavaSecuredFile.getParentFile.

Doc from java.io.File.getParentFile.

Returns the abstract pathname of this abstract pathname's parent, or null if this pathname does not name a parent directory.

The parent of an abstract pathname consists of the pathname's prefix, if any, and each name in the pathname's name sequence except for the last. If the name sequence is empty then the pathname does not name a parent directory.

Returns:File

The abstract pathname of the parent directory named by this abstract pathname, or null if this pathname does not name a parent

Annotations

@Override

Overrides java.io.File.getPath.

Doc from java.io.File.getPath.

Converts this abstract pathname into a pathname string. The resulting string uses the default name-separator character to separate the names in the name sequence.

Returns:String

The string form of this abstract pathname

Annotations

@Override

Overrides jnr.posix.JavaSecuredFile.list.

Doc from java.io.File.list.

Returns an array of strings naming the files and directories in the directory denoted by this abstract pathname that satisfy the specified filter. The behavior of this method is the same as that of the list() method, except that the strings in the returned array must satisfy the filter. If the given filter is null then all names are accepted. Otherwise, a name satisfies the filter if and only if the value true results when the FilenameFilter.accept(File, String) method of the filter is invoked on this abstract pathname and the name of a file or directory in the directory that it denotes.

Parameters

filter:FilenameFilter

A filename filter

Returns:String[]

An array of strings naming the files and directories in the directory denoted by this abstract pathname that were accepted by the given filter. The array will be empty if the directory is empty or if no names were accepted by the filter. Returns null if this abstract pathname does not denote a directory, or if an I/O error occurs.

Annotations

@Override

Overrides jnr.posix.JavaSecuredFile.listFiles.

Doc from java.io.File.listFiles.

Returns an array of abstract pathnames denoting the files in the directory denoted by this abstract pathname.

If this abstract pathname does not denote a directory, then this method returns null. Otherwise an array of File objects is returned, one for each file or directory in the directory. Pathnames denoting the directory itself and the directory's parent directory are not included in the result. Each resulting abstract pathname is constructed from this abstract pathname using the File(File, String) constructor. Therefore if this pathname is absolute then each resulting pathname is absolute; if this pathname is relative then each resulting pathname will be relative to the same directory.

There is no guarantee that the name strings in the resulting array will appear in any specific order; they are not, in particular, guaranteed to appear in alphabetical order.

Note that the java.nio.file.Files class defines the newDirectoryStream method to open a directory and iterate over the names of the files in the directory. This may use less resources when working with very large directories.

Returns:File[]

An array of abstract pathnames denoting the files and directories in the directory denoted by this abstract pathname. The array will be empty if the directory is empty. Returns null if this abstract pathname does not denote a directory, or if an I/O error occurs.

Annotations

@Override

Overrides jnr.posix.JavaSecuredFile.listFiles.

Doc from java.io.File.listFiles.

Returns an array of abstract pathnames denoting the files and directories in the directory denoted by this abstract pathname that satisfy the specified filter. The behavior of this method is the same as that of the listFiles() method, except that the pathnames in the returned array must satisfy the filter. If the given filter is null then all pathnames are accepted. Otherwise, a pathname satisfies the filter if and only if the value true results when the FileFilter.accept(File) method of the filter is invoked on the pathname.

Parameters

filter:FileFilter

A file filter

Returns:File[]

An array of abstract pathnames denoting the files and directories in the directory denoted by this abstract pathname. The array will be empty if the directory is empty. Returns null if this abstract pathname does not denote a directory, or if an I/O error occurs.

Annotations

@Override

Overrides java.io.File.listFiles.

Doc from java.io.File.listFiles.

Returns an array of abstract pathnames denoting the files and directories in the directory denoted by this abstract pathname that satisfy the specified filter. The behavior of this method is the same as that of the listFiles() method, except that the pathnames in the returned array must satisfy the filter. If the given filter is null then all pathnames are accepted. Otherwise, a pathname satisfies the filter if and only if the value true results when the FilenameFilter.accept(File, String) method of the filter is invoked on this abstract pathname and the name of a file or directory in the directory that it denotes.

Parameters

filter:FilenameFilter

A filename filter

Returns:File[]

An array of abstract pathnames denoting the files and directories in the directory denoted by this abstract pathname. The array will be empty if the directory is empty. Returns null if this abstract pathname does not denote a directory, or if an I/O error occurs.

Annotations

@Override

Hides java.io.File.listRoots.

Doc from java.io.File.listRoots.

List the available filesystem roots.

A particular Java platform may support zero or more hierarchically-organized file systems. Each file system has a root directory from which all other files in that file system can be reached.

This method returns an array of File objects that denote the root directories of the available filesystem roots. It is guaranteed that the canonical pathname of any file physically present on the local machine will begin with one of the roots returned by this method. There is no guarantee that a root directory can be accessed.

Returns:File[]

An array of File objects denoting the available filesystem roots, or null if the set of roots could not be determined. The array will be empty if there are no filesystem roots.

Overrides java.io.File.toString.

Doc from java.io.File.toString.

Returns the pathname string of this abstract pathname. This is just the string returned by the getPath method.

Returns:String

The string form of this abstract pathname

Annotations

@Override