java.nio.file.spi

Class FileTypeDetector


  • public abstract class FileTypeDetector
    extends Object
    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:
    Files.probeContentType(Path)
    • Constructor Detail

      • FileTypeDetector

        protected FileTypeDetector()
        Initializes a new instance of this class.
        Throws:
        SecurityException - If a security manager has been installed and it denies RuntimePermission("fileTypeDetector")
    • Method Detail

      • probeContentType

        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 examines 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 - the path to the file to probe
        Returns:
        The content type or null if the file type is not recognized
        Throws:
        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.
        See Also:
        Files.probeContentType(java.nio.file.Path)

Document created the 11/06/2005, last modified the 04/03/2020
Source of the printed document:https://www.gaudry.be/en/java-api-rf-java/nio/file/spi/FileTypeDetector.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

  1. View the html document Language of the document:fr Manuel PHP : https://docs.oracle.com

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Contents Haut