Top Description Constructors Methods
java.nio.file.spi

public abstract Class FileTypeDetector

extends Object
Class Inheritance
Known Direct Subclasses
sun.nio.fs.AbstractFileTypeDetector
Imports
java.nio.file.Path, java.io.IOException
A file type detector for probing a file to guess its file type.

A file type detector is a concrete implementation of this class, has a zero-argument constructor, and implements the abstract methods specified below.

The means by which a file type detector determines the file type is highly implementation specific. A simple implementation might examine the file extension (a convention used in some platforms) and map it to a file type. In other cases, the file type may be stored as a file attribute or the bytes in a file may be examined to guess its file type.

Since
1.7
See Also
java.nio.file.Files#probeContentType(Path)

Constructor Summary

AccessConstructor and Description
private
FileTypeDetector(Void ignore)

protected
FileTypeDetector()

Initializes a new instance of this class.

Method Summary

Modifier and TypeMethod and Description
private static Void
checkPermission()

public abstract String

Returns:

The content type or null if the file type is not recognized
probeContentType(Path
the path to the file to probe
path)

Probes the given file to guess its content type.

Inherited from java.lang.Object:
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Constructor Detail

FileTypeDetectorback to summary
private FileTypeDetector(Void ignore)
FileTypeDetectorback to summary
protected FileTypeDetector()

Initializes a new instance of this class.

Exceptions
SecurityException:
If a security manager has been installed and it denies RuntimePermission("fileTypeDetector")

Method Detail

checkPermissionback to summary
private static Void checkPermission()
probeContentTypeback to summary
public abstract String probeContentType(Path path) throws IOException

Probes the given file to guess its content type.

The means by which this method determines the file type is highly implementation specific. It may simply examine the file name, it may use a file attribute, or it may examine bytes in the file.

The probe result is the string form of the value of a Multipurpose Internet Mail Extension (MIME) content type as defined by RFC 2045: Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies. The string must be parsable according to the grammar in the RFC 2045.

Parameters
path:Path

the path to the file to probe

Returns:String

The content type or null if the file type is not recognized

Exceptions
IOException:
An I/O error occurs
SecurityException:
If the implementation requires to access the file, and a security manager is installed, and it denies an unspecified permission required by a file system provider implementation. If the file reference is associated with the default file system provider then the SecurityManager#checkRead(String) method is invoked to check read access to the file.
External Specification
https://www.rfc-editor.org/info/rfc2045
See Also
java.nio.file.Files#probeContentType